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Division of reproductive labour in societies represents a topic of interest in evolutionary biology at least since Darwin. The puzzle of how helpers can be selected for, in spite of their reduced fertility has found an explanation in the kin selection theory: workers can overcome the cost of helping and of forgiving direct reproduction by rearing sufficiently related individuals. However, in the Hymenoptera, little is known on the proximate mechanisms that regulate the division of labour in colonies. Our knowledge is based on several "primitive" ants from the subfamily Ponerinae and two highly eusocial Hymenoptera species. In the former, the dominance hierarchies allowing for the establishment of individuals as reproductives are well understood. In contrast, the pheromonal mechanisms that help maintain their reproductive status are not understood. Similarly in "higher" ants, pheromonal regulation mechanisms of worker reproduction by queens remain largely unknown. The aim of this study is to determine the modalities of production, distribution and action, as well as the identity of the queen pheromones affecting worker reproduction in the ant Myrmecia gulosa. This species belongs to the poorly studied subfamily Myrmeciinae, which is endemic to the Australian region. The subfamily represents, together with the Ponerinae, the most "primitive" ants: their morphology is close to that of the hypothetical ancestor of ants, and the specialisation of queens is weaker than that of "higher" ants. Simple regulation mechanisms were therefore expected to facilitate the investigation. The first step in this study was to characterise the morphological specialisation of queens and workers, and to determine the differences in reproductive potential associated with this specialisation. This study contributes to our understanding of the link between regulation of division of reproductive labour and social complexity. Furthermore, it will help shed light on the reproductive biology in the poorly known subfamily Myrmeciinae. Queens were recognised by workers on the basis of cuticular as well as gland extracts or products. What is the exact function of the multiple pheromones identified and how they interact remains to be determined. This could help understand why queen "signal" in a "primitive" ant with weakly specialised queens such as M. gulosa appears to be as complex as in highly eusocial species. Primer pheromones act on workers? physiology and have long-term effect. Whether workers of M. gulosa reproduce or not is determined by the detection of a queen pheromone of this type. Direct physical contact with the queen is necessary for workers to detect this pheromone. Thus, the colony size of M. gulosa is compatible with a simple system of pheromone perception by workers based on direct physical contact with the queen. When prevented from establishing physical contact with their queen, some workers start to reproduce and are policed by nestmates. The low volatility of the cuticular hydrocarbons (CHCs), their repartition over the entire cuticle and the existence of queen and worker specific CHC profiles suggest that these chemicals constitute a queen pheromone. Importance of HC versus non-HC compounds was confirmed by bioassaying purified fraction of both classes of chemicals. This study demonstrates for the first time that purified HCs indeed are at the basis of the recognition of reproductive status. This supports the idea that they are also at the basis of the recognition of queens by their workers. As CHCs profiles of workers and queens become similar with acquisition of reproductive status, they represent honest fertility markers. These markers could be used as signals of the presence of reproductives in the colonies, and represent the basis of the regulation of division of reproductive labour.
A significant relatedness is of fundamental importance for the evolution and maintenance of social life (kin selection theory, Hamilton 1964a,b). Not only kin selection itself, but also more complex evolutionary theories make predictions on the occurrence of conflict and co-operation in animal societies. They all depend on the genetic relationships among individuals. Therefore, the study of unrelated, co-operating individuals provides a unique opportunity to critically test predictions based on these evolutionary theories. Using allozyme electrophoresis, the study species Pachycondyla villosa was found to represent three different species. Young queens in one of these species, provisionally called Pachycondyla cf. inversa, may co-operate during colony founding (pleometrosis). Approximately 50 per cent of all founding colonies collected near Itabuna, Brazil, consisted of two to five founding queens. Queens of P. cf. inversa have to forage for food (semi-claustral founding), and in founding associations only one queen specialised for this risky task. A microsatellite study showed that nestmate queens were typically not related. How can a division of labour be achieved, where one individual performs risky tasks to the favour of another individual to which it is not related? In contrast to the predictions made by group selectionists, this study provided clear evidence that the division of labour among co-foundresses of P. cf. inversa results from social competition: Co-foundresses displayed aggressive interactions and formed dominance hierarchies which predominantly served to force subordinates to forage. The frequency of queen antagonism increased with the duration since food was last added to the foraging arena. The social status was not, or only weakly associated with the reproductive status: As predicted by the reproductive skew theory, all foundresses laid eggs at similar rates, though the subordinate may be harassed during egg laying and occasionally, some of her eggs may be eaten by the dominant. The differential oophagy presumably was also reflected in a microsatellite study of foundress associations, which was conducted shortly after the first workers emerged: Here, the co-foundresses occasionally contributed unequally to the colony’s workers. Conflicts among workers or between workers and queens, e.g. over the division of labour or sex ratio, strongly depend on the genetic relationships among members of a colony. The number of two to five co-founding queens in polygynous colonies of P. cf. inversa, and the lack of relatedness among them, should lead to a decrease in the relatedness of workers. However, nestmate workers were closely related. Furthermore, worker relatedness may decrease as several queens were found to be multiply inseminated. Inbreeding coefficients were significantly different from zero in both queens and workers. No evidence for a geographical substructuring of the population was found. The deviation from random mating presumably was probably due to small, localised nuptial flights. Virgin queens do not mate near their natal nest and disperse before founding colonies. The analysis of cuticular hydrocarbons obtained from live queens revealed consistent differences between the patterns of cuticular hydrocarbons of queens with high vs. low rank: only high-ranking queens showed considerable amounts of cuticular pentadecane (n-C15) and heptadecene (n-C17:1). The presence of the two substances apparently was not associated with reproductive status. It is not yet known, if the two substances indeed serve to communicate high social status in P. cf. inversa. In experimentally assembled associations of two founding queens, queens engaged in aggressive interactions which already within one to twenty minutes resulted in stable dominance hierarchies. The queens attacking first usually won the contest and became dominant. Nest ownership at least for a couple of days did not influence the outcome of dominance interactions in the laboratory experiments, whereas queen body size apparently played an important role: In all eight trials, the larger queen became dominant. However, dominant queens from natural foundress associations were on average not larger than subordinates, suggesting that in the field, resident asymmetries might override size asymmetries only after a more prolonged period of nest ownership. Sequencing of the COI/COII region of mitochondrial DNA displayed sufficient variability for the study of the sociogenetic structure of the secondarily polygynous ant Pachycondyla obscuricornis: Six different haplotypes could be distinguished among six workers of different colonies from one study population in Costa Rica. The variability of other methods which were established (RFLPs, microsatellites, allozymes, and multilocus DNA fingerprinting) was too low for a further study on the genetic structure in P. obscuricornis.
In the present study, a new gene cluster of Listeria monocytogenes EGD containing three internalin genes was identified and characterized. These genes, termed inlG, inlH and inlE, encode proteins of 490, 548 and 499 amino acids, respectively, which belong to the class of large, surface-bound internalins. Each of these proteins contains a signal peptide, two regions of repeats (Leucine-rich repeats and B repeats), an inter-repeat region and a putative cell wall anchor sequence containing the sorting motiv LPXTG. PCR analysis revealed the presence of the inlGHE gene cluster in most L. monocytogenes serotypes. A similar gene cluster termed inlC2DE localised to the same position on the chromosome was described in a different L. monocytogenes EGD isolate. Sequence comparison of the two clusters indicates that inlG is a new internalin gene, while inlH was generated by a site-specific recombination leading to an in-frame deletion which removed the 3'-terminal end of inlC2 and a 5'-portion of inlD. The genes inlG, inlH and inlE seem to be transcribed extracellularly and independent of PrfA. To study the function of the inlGHE gene cluster several in-frame deletion mutants were constructed which lack the genes of the inlGHE cluster individually or in combination with other inl genes. When tested in the mouse model, the inlGHE mutant showed a significant reduction of bacterial counts in liver and spleen in comparison to the wild type strain, indicating that the inlGHE gene cluster plays an important role in virulence of L. monocytogenes. The ability of this mutant to invade non-phagocytic cells in vitro was however two- to three-fold higher than that of the parental strain. To examine whether deletion of the single genes from the cluster has the same stimulatory effect on invasiveness as deletion of the complete gene cluster, the single in-frame deletion mutants inlG, inlH and inlE were constructed. These mutants were subsequently reverted to the wild type by introducing a copy of the corresponding intact gene into the chromosome by homologous recombination using knock-in plasmids. To determine a putative contribution of InlG, InlH and InlE in combination with other internalins to the entry of L. monocytogenes into mammalian cells, the combination mutants inlA/GHE, inlB/GHE, inlC/GHE, inlA/B/GHE, inlB/C/GHE, inlA/C and inlA/C/GHE were constructed. Transcription of the genes inlA, inlB and inlC in these mutants was studied by RT-PCR. Deletion of inlGHE enhances transcription of inlA and inlB, but not of inlC. This enhancement is not transient but can be observed at different time-points of the bacterial growth curve. Deletion of inlA also increases transcription of inlB and vice-versa. In contrast, the amounts of inlA and inlB transcripts in the single deletion mutants inlG, inlH and inlE were similar to those from the wild type.
Safer without Sex?
(1999)
Highly eusocial insect societies, such as all known ants, are typically characterized by a reproductive division of labor between queens, who are inseminated and reproduce, and virgin workers, who engage in foraging, nest maintenance and brood care. In most species workers have little reproductive options left: They usually produce haploid males by arrhenotokous parthenogenesis, both in the queenright and queenless condition. In the phylogenetically primitive subfamily Ponerinae reproductive caste dimorphism is much less pronounced: Ovarian morphology is rather similar in queens and workers, which additionally retain a spermatheca. In many ponerine species workers mate and may have completely replaced the queen caste. This similarity in reproductive potential provides for the evolution of diverse reproductive systems. In addition, it increases the opportunity for reproductive conflicts among nestmates substantially. Only in a handful of ant species, including Platythyrea punctata, workers are also able to rear diploid female offspring from unfertilized eggs by thelytokous parthenogenesis. The small ponerine ant P. punctata (Smith) is the only New World member of the genus reaching as far north as the southern USA, with its center of distribution in Central America and the West Indies. P. punctata occurs in a range of forest habitats including subtropical hardwood forests as well as tropical rain forests. In addition to queens, gamergates and thelytokous workers co-occur in the same species. This remarkable complexity of reproductive strategies makes P. punctata unique within ants and provides an ideal model system for the investigation of reproductive conflicts within the female caste. Colonies are usually found in rotten branches on the forest floor but may also be present in higher strata. Colonies contained on average 60 workers, with a maximum colony size of 148 workers. Queens were present in only ten percent of the colonies collected from Florida, but completely absent both from the populations studied in Barbados and Puerto Rico. Males were generally rare. In addition, morphological intermediates between workers and queens (so-called intercastes) were found in 16 colonies collected in Florida. Their thorax morphology varied from an almost worker-like to an almost queen-like thorax structure. Queen and intercaste size, however, did not differ from those of workers. Although workers taken from colonies directly after collection from the field engaged in aggressive interactions, nestmate discrimination ceased in the laboratory suggesting that recognition cues used are derived from the environment. Only one of six queens dissected was found to be inseminated but not fertile. Instead, in most queenless colonies, a single uninseminated worker monopolized reproduction by means of thelytokous parthenogenesis. A single mated, reproductive worker (gamergate) was found dominating reproduction in the presence of an inseminated alate queen only in one of the Florida colonies. The regulation of reproduction was closely examined in ten experimental groups of virgin laboratory-reared workers, in which one worker typically dominated reproduction by thelytoky despite the presence of several individuals with elongated, developing ovaries. In each group only one worker was observed to oviposit. Conflict over reproduction was intense consisting of ritualized physical aggression between some nestmates including antennal boxing, biting, dragging, leap and immobilization behaviors. The average frequency of interactions was low. Aggressive interactions allowed to construct non-linear matrices of social rank. On average, only five workers were responsible for 90 percent of total agonistic interactions. In 80 percent of the groups the rate of agonistic interactions increased after the experimental removal of the reproductive worker. While antennal boxing and biting were the most frequent forms of agonistic behaviors both before and after the removal, biting and dragging increased significantly after the removal indicating that agonistic interactions increased in intensity. Once a worker obtains a high social status it is maintained without the need for physical aggression. The replacement of reproductives by another worker did however not closely correlate with the new reproductive's prior social status. Age, however, had a profound influence on the individual rate of agonistic interactions that workers initiated. Especially younger adults (up to two month of age) and callows were responsible for the increase in observed aggression after the supersedure of the old reproductive. These individuals have a higher chance to become reproductive since older, foraging workers may not be able to develop their ovaries. Aggressions among older workers ceased with increasing age. Workers that already started to develop their ovaries should pose the greatest threat to any reproductive individual. Indeed, dissection of all experimental group revealed that aggression was significantly more often directed towards both individuals with undeveloped and developing ovaries as compared to workers that had degenerated ovaries. In all experimental groups reproductive dominance was achieved by callows or younger workers not older than four month. Age is a better predictor of reproductive dominance than social status as inferred from physical interactions. Since no overt conflict between genetical identical individuals is expected, in P. punctata the function of agonistic interactions in all-worker colonies, given the predominance of thelytokous parthenogenesis, remains unclear. Physical aggression could alternatively function to facilitate a smooth division of non-reproductive labor thereby increasing overall colony efficiency. Asexuality is often thought to constitute an evolutionary dead end as compared with sexual reproduction because genetic recombination is limited or nonexistent in parthenogenetic populations. Microsatellite markers were developed to investigate the consequences of thelytokous reproduction on the genetic structure of four natural populations of P. punctata. In the analysis of 314 workers taken from 51 colonies, low intraspecific levels of variation at all loci, expressed both as the number of alleles detected and heterozygosities observed, was detected. Surprisingly, there was almost no differentiation within populations. Populations rather had a clonal structure, with all individuals from all colonies usually sharing the same genotype. This low level of genotypic diversity reflects the predominance of thelytoky under natural conditions in four populations of P. punctata. In addition, the specificity of ten dinucleotide microsatellite loci developed for P. punctata was investigated in 29 ant species comprising four different subfamilies by cross-species amplification. Positive amplification was only obtained in a limited number of species indicating that sequences flanking the hypervariable region are often not sufficiently conserved to allow amplification, even within the same genus. The karyotype of P. punctata (2n = 84) is one of the highest chromosome numbers reported in ants so far. A first investigation did not show any indication of polyploidy, a phenomenon which has been reported to be associated with the occurrence of parthenogenesis. Thelytokous parthenogenesis does not appear to be a very common phenomenon in the Hymenoptera. It is patchily distributed and restricted to taxa at the distant tips of phylogenies. Within the Formicidae, thelytoky has been demonstrated only in four phylogenetically very distant species, including P. punctata. Despite its advantages, severe costs and constraints may have restricted its rapid evolution and persistence over time. The mechanisms of thelytokous parthenogenesis and its ecological correlates are reviewed for the known cases in the Hymenoptera. Investigating the occurrence of sexual reproduction in asexual lineages indicates that thelytokous parthenogenesis may not be irreversible. In P. punctata the occasional production of sexuals in some of the colonies may provide opportunity for outbreeding and genetic recombination. Thelytoky can thus function as a conditional reproductive strategy. Thelytoky in P. punctata possibly evolved as an adaptation to the risk of colony orphanage or the foundation of new colonies by fission. The current adaptive value of physical aggression and the production of sexuals in clonal populations, where relatedness asymmetries are virtually absent, however is less clear. Quite contrary, thelytoky could thereby serve as the stepping stone for the subsequent loss of the queen caste in P. punctata. Although P. punctata clearly fulfills all three conditions of eusociality, the evolution of thelytoky is interpreted as a first step in a secondary reverse social evolution towards a social system more primitive than eusociality.
Many polymorphisms are linked to alternative reproductive strategies. In animals, this is particularly common in males. Ant queens are an important exception. The case of ant queen size dimorphisms has not been studied in sufficient detail, and thus this thesis aimed at elucidating causes and consequences of the different size of small (microgynous) and large (macrogynous)ant queens using the North American ant species Leptothorax rugatulus as a model system. Employing neutral genetic markers, no evidence for a taxonomically relevant separation of the gene pools of macrogynes and microgynes was found. Queens in polygynous colonies were highly related to each other, supporting the hypothesis that colonies with more than one queen commonly arise by secondary polygyny, i.e. by the adoption of daughter queens into their natal colonies. These results and conclusions are also true for the newly discovered queen size polymorphism in Leptothorax cf. andrei. Several lines of evidence favor the view that macrogynes predominantly found their colonies independently, while microgynes are specialized for dependent colony founding by readoption. Under natural conditions, mother and daughter size are highly correlated and this is also true for laboratory colonies. However, the size of developing queens is influenced by queens present in the colony. Comparing populations across the distribution range, it turns out that queen morphology (head width and ovariole number) is more differentiated among populations than worker morphology (coloration, multivariate size and shape), colony characteristics (queen and worker number per colony) or neutral genetic variation. Northern and southern populations differed consistently which indicates the possibility of two different species. The queen size dimorphism in L. rugatulus did neither influence the sex ratio produced by a colony, nor its ratio of workers to gynes. However, the sex ratio covaried strongly across populations with the average number of queens per colony in accordance with sex ratio theory. At the colony level, sex ratio could not be explained by current theory and a hypothesis at the colony-level was suggested. Furthermore, queen body size has no significant influence on the amount of reproductive skew among queens. Generally, the skew in L. rugatulus is low, and supports incomplete control models, rather than the classic skew models. In eight of fourteen mixed or microgynous colonies, the relative contributions of individual queens to workers, gynes and males were significantly different. This was mainly due to the fact that relative body size was negatively correlated with the ratio of gynes to workers produced. This supports the kin conflict over caste determination hypothesis which views microgyny as a selfish reproductive tactic.
Biofilm production is an important step in the pathogenesis of S. epidermidis polymer-associated infections and depends on the expression of the icaADBC operon leading to the synthesis of a polysaccharide intercellular adhesin (PIA). The PIA represents a sugar polymer consisting of ß-1,6 linked N-acetyl glucosaminoglycans and mediates the intercellular adherence of the bacteria to each other and the accumulation of a multilayered biofilm. Epidemiological and experimental studies strongly suggest that PIA-production and subsequently biofilm formation contributes significantly to the virulence of specific S. epidermidis strains. This work aimed on the investigation of external factors regulating the ica expression in S. epidermidis. For this purpose, a reporter gene fusion between the ica promoter and the beta-galactosidase gene lacZ from E. coli was constructed and integrated into the chromosome of an ica positive S. epidermidis clinical isolate. The reporter gene fusion was used to investigate the influence of external factors and of sub-MICs of different antibiotics on the ica expression. It was shown that the S. epidermidis biofilm formation is growth phase dependent with a maximum expression in the late logarithmic and early stationary growth phase. The optimal expression was recorded at 42 °C at a neutral pH ranging from 7.0 to 7.5. The glucose content of the medium was found to be essential for biofilm formation, since concentrations of 1.5 to 2 per cent glucose induced the ica expression. In addition, external stress factors as high osmolarity (mediated by 3 to 5 per cent sodium chloride), and sub-lethal concentrations of detergents, ethanol, hydrogene peroxide, and urea significantly enhanced the biofilm production. Subinhibitory concentrations of tetracyline, the semisynthetic streptogramin quinupristin/dalfopristin and the streptogramin growth promoter virginiamycin were found to enhance the ica expression 8 to 11-fold, respectively, whereas penicillin, oxacillin, gentamicin, clindamycin, vancomycin, teicoplanin, ofloxacin, and chloramphenicol had no effects. A weak induction was recorded for sub-MICs of erythromycin. Both quinupristin/ dalfopristin and tetracyline exhibited a strong postexposure effect on the S. epidermidis ica expression, respectively, even when the substances were immediately removed from the growth medium. The results were confirmed by Northern blot analysis of the ica transcription and quantitative analysis of biofilm formation in a colorimetric assay. Expression of the icaprom::lacZ reporter gene plasmid in Bacillus subtilis and S. epidermidis revealed that the ica induction by sub-MICs of streptogramins and tetracycline might depend on unidentified regulatory elements which are specific for the staphylococcal cell. In contrast, the activation by external stress signals seems to be mediated by factors which are present both in Staphylococci and in Bacillus subtilis. Construction and analysis of an agr-mutant in a biofilm-forming S. epidermidis strain excluded the possibility that the Agr-quorum-sensing system significantly contributes to the ica expression in the stationary growth phase. However, clear evidence was provided that in S. aureus the ica transcription depends on the expression of the alternative transcription factor sigmaB, which represents a global regulator of the stress response in S. aureus as well as in B. subtilis. For this purpose, a sigB knockout mutant had been constructed in a biofilm-forming S. aureus. This mutant showed a markedly decrease of the ica transcription and biofilm-production, whereas a complement strain carrying the sigB gene on an expression vector completely restored the biofilm-forming phenotype of the S. aureus wild type. Southern blot analysis indicated that the the sigB gene is also present in S. epidermidis and Northern analyses of the sigB and the ica transcription revealed that both genes are activated under identical conditions (i. e. in the stationary growth phase and by external stress factors) suggesting a similar regulatory pathway as in S. aureus. However, since neither in S. aureus nor in S. epidermidis the ica promoter has obvious similiarities to known SigB-dependent promotoer sequences it is tempting to speculate that the ica activation is not directely mediated by SigB, but might be indirectely controlled by other SigB-dependent regulatory elements which remain to be elucidated.
The transmission of proliferative and developmental signals from activated cell-surface receptors to initiation of cellular responses in the nucleus is synergically controlled by the coordinated action of a diverse set of intracellular signalling proteins. The Ras/Raf/MEK/MAPK signalling pathway has been shown to control the expression of genes which are crucial for the physiological regulation of cell proliferation, differentiation and apoptosis. Within this signalling cascade, the Raf protein family of serine/threonine kinases serves as a central intermediate which connects to many of other signal transduction pathways. To elucidate the signalling functions of the different Raf kinases in motoneurons during development, the expression, distribution and subcellular localization of Rafs in the spinal cord and the facial nucleus in brainstem of mice at various embryonic and postnatal stages were investigated. Moreover, we have investigated the intracellular redistribution of Raf molecules in isolated motoneurons from 13 or 14 day old mouse embryos, after addition or withdrawal of neurotrophic factors to induce Raf kinases activation in vitro. Furthermore, in order to investigate the potential anti-apoptotic function of Raf kinases on motoneurons, we isolated motoneurons from B-raf-/- and c-raf-1-/- mouse embryos and analysed the survival and differentiation effects of neurotrophic factors in motoneurons lacking B-Raf and c-Raf-1. We provide evidence here that all three Raf kinases are expressed in mouse spinal motoneurons. Their expression increases during the period of naturally occurring cell death of motoneurons. In sections of embryonic and postnatal spinal cord, motoneurons express exclusively B-Raf and c-Raf-1, but not A-Raf, and subcellularly Raf kinases are obviously colocalized with mitochondria. In isolated motoneurons, most of the B-Raf or c-Raf-1 immunoreactivity is located in the perinuclear space but also in the nucleus, especially after activation by addition of CNTF and BDNF in vitro. We found that c-Raf-1 translocation from the cytosol into the nucleus of motoneurons after its activation by neurotrophic factors is a distinct event. As a central finding of our study, we observed that the viability of isolated motoneurons from B-raf but not c-raf-1 knockout mice is lost even in the presence of CNTF and other neurotrophic factors. This indicates that B-Raf but not c-Raf-1, which is still present in B-raf deficient motoneurons, plays a crucial role in mediating the survival effect of neurotrophic factors during development. In order to prove that B-Raf is an essential player in this scenario, we have re-expressed B-Raf in mutant sensory and motor neurons by transfection. The motoneurons and the sensory neurons from B-raf knockout mouse which were transfected with exogenous B-raf gene revealed the same viability in the presence of neurotrophic factors as primary neurons from wild-type mice. Our results suggest that Raf kinases have important signalling functions in motoneurons in mouse CNS. In vitro, activation causes redistribution of Raf protein kinases, particularly for c-Raf-1, from motoneuronal cytoplasm into the nucleus. This redistribution of c-Raf-1, however, is not necessary for the survival effect of neurotrophic factors, given that B-raf-/- motor and sensory neurons can not survive despite the presence of c-Raf-1. We hypothesize that c-Raf-1 nuclear translocation may play a direct role in transcriptional regulation as a consequence of neurotrophic factor induced phosphorylation and activation of c-Raf-1 in motoneurons. Moreover, the identification of target genes for nuclear translocated c-Raf-1 and of specific cellular functions initiated by this mechanism awaits its characterization.
The Mouthparts of Ants
(2001)
Ant mandible movements cover a wide range of forces, velocities and precision. The key to the versatility of mandible functions is the mandible closer muscle. In ants, this muscle is generally composed of distinct muscle fiber types that differ in morphology and contractile properties. Volume proportions of the fiber types are species-specific and correlate with feeding habits. Two biomechanical models explain how the attachment angles are optimized with respect to force and velocity output and how filament-attached fibers help to generate the largest force output from the available head capsule volume. In general, the entire mandible closer muscle is controlled by 10-12 motor neurons, some of which exclusively supply specific muscle fiber groups. Simultaneous recordings of muscle activity and mandible movement reveal that fast movements require rapid contractions of fast muscle fibers. Slow and accurate movements result from the activation of slow muscle fibers. Forceful movements are generated by simultaneous co-activation of all muscle fiber types. For fine control, distinct fiber bundles can be activated independently of each other. Retrograde tracing shows that most dendritic arborizations of the different sets of motor neurons share the same neuropil in the suboesophageal ganglion. In addition, some motor neurons invade specific parts of the neuropil. The labiomaxillary complex of ants is essential for food intake. I investigated the anatomical design of the labiomaxillary complex in various ant species focusing on movement mechanisms. The protraction of the glossa is a non muscular movement. Upon relaxation of the glossa retractor muscles, the glossa protracts elastically. I compared the design of the labiomaxillary complex of ants with that of the honey bee, and suggest an elastic mechanism for glossa protraction in honey bees as well. Ants employ two different techniques for liquid food intake, in which the glossa works either as a passive duct (sucking), or as an up- and downwards moving shovel (licking). For collecting fluids at ad libitum food sources, workers of a given species always use only one of both techniques. The species-specific feeding technique depends on the existence of a well developed crop and on the resulting mode of transporting the fluid food. In order to evaluate the performance of collecting liquids during foraging, I measured fluid intake rates of four ant species adapted to different ecological niches. Fluid intake rate depends on sugar concentration and the associated fluid viscosity, on the species-specific feeding technique, and on the extent of specialization on collecting liquid food. Furthermore, I compared the four ant species in terms of glossa surface characteristics and relative volumes of the muscles that control licking and sucking. Both probably reflect adaptations to the species-specific ecological niche and determine the physiological performance of liquid feeding. Despite species-specific differences, single components of the whole system are closely adjusted to each other according to a general rule.
Tropical rain forests and coral reefs are usually regarded as the epitome of complexity and diversity. The mechanisms, however, that allow so many species to coexist continuously, still need to be unraveled. Earlier equilibrium models explain community organization with a strict niche separation and specialization of the single species, achieved mainly by interspecific competition and consecutive resource partitioning. Recent non-equilibrium or stochastic models see stochastic factors ("intermediate disturbances") as more important. Such systems are characterized by broad niche overlaps and an unpredictable species composition. Mechanisms of coexistence are most interesting where species interactions are strongest and species packing is highest. This is the case within a functional group or guild where species use similar resources. In this project a community of seven closely related leaf beetle species (Chrysomelidae: Cassidinae) was investigated which coexist on a common host plant system (fam. Convovulaceae) in a tropical moist savanna (Ivory Coast, Comoé-Nationalpark). A broad overlap in the seasonal phenology of the leaf beetle species stood in contrast to a distinct spatial niche differentiation. The beetle community could be separated in a savanna-group (host plant: Ipomoea) and in a river side group (host plant: Merremia). According to a correspondence analysis the five species at the river side, using a common host plant, Merremia hederacea, proved to be predictable in their species composition. They showed a small scale niche differentiation along the light gradient (microhabitats). Laboratory studies confirmed differences in the tolerance towards high temperatures (up to 50°C in the field). Physiological trade-offs between phenology, microclimate and food quality seem best to describe patterns of resource use of the beetle species. Further a phylogeny based on mt-DNA sequencing of the beetle community was compared to its ecological resource use and the evolution of host plant use was reconstructed
Listeriae are Gram positive, facultative, saprophytic bacteria capable of causing opportunistic infections in humans and animals. This thesis presents three separate lines of inquiries that can lead to the eventual convergence of a global view of Listeria as pathogen in the light of evolution, genomics, and function. First, we undertook to resolve the phylogeny of the genus Listeria with the goal of ascertaining insights into the evolution of pathogenic capability of its members. The phylogeny of Listeriae had not yet been clearly resolved due to a scarcity of phylogenetically informative characters within the 16S and 23S rRNA molecules. The genus Listeria contains six species: L. monocytogenes, L. ivanovii, L. innocua, L. seeligeri, L. welshimeri, and L. grayi; of these, L. monocytogenes and L. ivanovii are pathogenic. Pathogenicity is enabled by a 10-15Kb virulence gene cluster found in L. seeligeri, L. monocytogenes and L. ivanovii. The genetic contents of the virulence gene cluster loci, as well as some virulence-associated internalin loci were compared among the six species. Phylogenetic analysis based on a data set of nucleic acid sequences from prs, ldh, vclA, vclB, iap, 16S and 23S rRNA genes identified L. grayi as the ancestral branch of the genus. This is consistent with previous 16S and 23S rRNA findings. The remainder 5 species formed two groupings. One lineage represents L. monocytogenes and L. innocua, while the other contains L. welshimeri, L. ivanovii and L. seeligeri, with L. welshimeri forming the deepest branch within this group. Deletion breakpoints of the virulence gene cluster within L. innocua and L. welshimeri support the proposed tree. This implies that the virulence gene cluster was present in the common ancestor of L. monocytogenes, L. innocua, L. ivanovii, L. seeligeri and L. welshimeri; and that pathogenic capability has been lost in two separate events represented by L. innocua and L. welshimeri. Second, we attempted to reconstitute L. innocua of its deleted virulence gene cluster, in its original chromosomal location, from the L. monocytogenes 12 Kb virulence gene cluster. This turned out particularly difficult because of the limits of genetic tools presently available for the organism. The reconstitution was partially successful. The methods and approaches are presented, and all the components necessary to complete the constructs are at hand for both L. innocua and the parallel, positive control of L. monocytogenes mutant deleted of its virulence gene cluster. Third, the sequencing of the entire genome of L. monocytogenes EGDe was undertaken as part of an EU Consortium. Our lab was responsible for 10 per cent of the labor intensive gap-closure and annotation efforts, which I helped coordinate. General information and comparisons with sister species L. innocua and a close Gram positive relative Bacillus subtilis are presented in context. The areas I personally investigated, namely, sigma factors and stationary phase functions, are also presented. L. monocytogenes and L. innocua both possess surprisingly few sigma factors: SigA, SigB, SigH, SigL, and an extra-cytoplasmic function type sigma factor (SigECF). The stationary phase genes of L. monocytogenes is compared to the well-studied, complex, stationary phase networks of B. subtilis. This showed that while genetic competence functions may be operative in unknown circumstances, non-sporulating Listeria opted for very different approaches of regulation from B. subtilis. There is virtually no overlap of known, stationary phase genes between Listeria and Gram negative model organism E. coli.
Cofilin
(1999)
This study has identified cofilin, an actin binding protein, as a control element in the reorganization of the actin cytoskeleton which is highly relevant for T lymphocyte activation. Cofilin is regulated in its activity by reversible phosphorylation which is inducible by stimulation through accessory receptors such as CD2 and CD28. First it could be demonstrated that accessory receptor triggering induces the transient association of cofilin with the actin cytoskeleton and that only the dephosphorylated form of cofilin possesses the capacity to bind cytoskeletal actin in vivo. PI3-kinase inhibitors block both the dephosphorylation of cofilin and its association with the actin cytoskeleton. Importantly, cofilin, actin, PI3-kinase and one of its substrates, namely phosphatidylinositol 4,5-bisphosphate (PtdIns(4,5)P2) which can bind to cofilin, co-localize within CD2-receptor caps. The cofilin/F-actin interaction has been identified as a crucial regulatory element for receptor cap formation and the strength of signal transduction. To this end, appropriately designed cell permeable non-toxic peptides that are homologous to actin binding motifs of the human cofilin sequence were introduced into untransformed human peripheral blood T lymphocytes. These peptides competitively and dose dependently inhibit the activation induced interaction of cofilin with the actin cytoskeleton in vivo. By this approach it was possible to study, for the first time, the functional consequences of this interaction in immunocompetent T cells. The present data demonstrate that inhibition of the actin/cofilin interaction in human T lymphocytes by means of these cofilin derived peptides abolishes receptor cap formation and strongly modulates functional T cell responses such as T cell proliferation, interleukin-2 production, cell surface expression of CD69, gIFN production, and CD95L expression. Importantly, receptor independent activation by PMA and calcium ionophore circumvents these peptide produced inhibitory effects on lymphocyte stimulation and places the cofilin/actin interaction to a proximal step in the cascade of signaling events following T cell activation via surface signals. The present results are novel since as yet no information existed regarding the molecular elements which link cell surface receptor stimulation directly to the resulting reorganization of the actin cytoskeleton.
Distinct juvenile behaviour differences, changes in adult sizes and reproductive capacity and a long reproductive period triggered the working hypothesis of two alternative life-cycle strategies favouring aestivation or immediate reproduction. The hypothesis for the life-cycles of Hyperolius nitidulus that differed from the commonly assumed reproductive strategy for this species was confirmed by the results of this study. Aestivated juveniles start to mature at the beginning of the rainy season and reproduce subsequently. Their tadpoles grow until metamorphosis and either reproduce in this same season, in which case their offspring aestivates (one year - two generations), or they delay reproduction to the following year and aestivate themselves (one year - one generation). Juveniles trying to reproduce as fast as possible will invest in growth and differentiation and show no costly adaptations to aestivation, while juveniles delaying reproduction to the following rainy season will be well adapted to dry season conditions. Indirect evidence for the existence of a second generation was found in all three investigation years: adult size decreased abruptly towards the end of the rainy season, mainly due to the arrival of very small individuals, and clutch size decreased abruptly. Also at the end of the rainy season juveniles had two behavioural types: one hiding on the ground and clearly avoiding direct sunlight and another sitting freely above ground showing higher tolerance towards dry season conditions (high air temperatures and low humidity). Skin morphology differed between the types showing many more purine crystals in a higher order in the dry-season adapted juveniles. The final proof for the existence of a second generation came with the recapture of individuals marked as juveniles when they left the pond. The 45 recaptured frogs definitely came back to the pond to reproduce during the same season in 1999. Second generation frogs (males and females) were significantly smaller than the rest of all adults and egg diameter was reduced. Clutch size did not differ significantly. It was found that females did not discriminate against second generation males when coming to the ponds to reproduce. Second generation males had a similar chance to be found in amplexus as first generation males. Indirect and direct evidence for a second generation matched very well. The sudden size decrease in adults occurred just at the time when the first marked frogs returned. The observation that freshly metamorphosed froglets were able to sit in the sun directly after leaving the water led to the assumption that the decision whether to aestivate or to reproduce already happens during the frogs' larval period. Water chemistry and the influence of light was investigated to look for the factors triggering the decision, but only contaminated water increased the number of juveniles ready for aestivation. Whether the life history polymorphism observed in Hyperolius nitidulus is due to phenotypic plasticity or genetic polymorphism is still not known. Despite this uncertainty, there is no doubt that the optimal combination of different life histories is profitable and may be a reason for the wide range and high local abundance of Hyperolius nitidulus.
The study examines the sensory ecology of CO2 perception in leaf-cutting ants. It begins with the ecological role of CO2 for leaf-cutting ants. Inside the subterranean nests of Atta vollenweideri large amounts of CO2 are produced by the ants and their symbiotic fungus. Measurements in field nest at different depths revealed that CO2 concentrations do not exceed 2 per cent in mature nests. These findings indicate effective ventilation even at depths of 2 m. Small colonies often face the situation of reduced ventilation when they close their nest openings as a measure against flooding. A simulation of this situation in the field as well as in the laboratory revealed increasing CO2 concentrations causing reduced colony respiration which ultimately might limit colony success. Wind-induced ventilation is the predominant ventilation mechanism of the nests of Atta vollenweideri, shown by an analysis of external wind and airflow in the channels. The mound architecture promotes nest ventilation. Outflow channels have their openings in the upper, central region and inflow channels had their openings in the lower, peripheral region of the nest mound. Air is sucked out through the central channels, followed by a delayed inflow of air through the peripheral channels. The findings support the idea that the nest ventilation mechanism used by Atta vollenweideri resembles the use of Bernoulli’s principle in Venturi Tubes and Viscous Entrainment. CO2 is important in a second context besides microclimatic control. A laboratory experiment with Atta sexdens demonstrated that leaf-cutting ants are able to orientate in a CO2 gradient. Foragers chose places with higher CO2 concentration when returning to the nest. This effect was found in all homing foragers, but it was pronounced for workers carrying leaf fragments compared to workers without leaf fragments. The findings support the hypothesis that CO2 gradients are used as orientation cue inside the (dark) nest to find suited fungus chambers for unloading of the leaf fragments. After the importance of CO2 in the natural history of the ants has thus been demonstrated, the study identifies for the first time in Hymenoptera type and location of the sensory organ for CO2 perception. In Atta sexdens a single neuron associated with the sensilla ampullacea was found to respond to CO2. Since it is the only neuron of this sensillum, the sensillum characters can be assumed to be adapted for CO2 perception. A detailed description of the morphology and the ultrastructure allows a comparison with sensilla for CO2 perception found in other insects and provides more information about sensillum characters and their functional relevance. The CO2 receptor cells respond to increased CO2 with increased neural activity. The frequency of action potentials generated by the receptor cell shows a phasic-tonic time course during CO2 stimulation and a reduced activity after stimulation. Phasic response accomplished with a reduced activity after stimulation results in contrast enhancement and the ability to track fast fluctuations in CO2 concentration. The neurons have a working range of 0 to 10 per cent CO2 and thus are able to respond to the highest concentrations the ants might encounter in their natural environment. The most exciting finding concerning the receptor cells is that the CO2 neurons of the leaf-cutting ants do not adapt to continuous stimulation. This enables the ants to continuously monitor the actual CO2 concentration of their surroundings. Thus, the sensilla ampullacea provide the ants with the information necessary to orientate in a CO2 gradient (tracking of fluctuations) as well as with the necessary information for microclimatic control (measuring of absolute concentrations).
The identification of NRAGE
(2001)
The inhibitor of apoptosis proteins (IAPs) have been shown to interact with a growing number of intracellular proteins and signalling pathways in order to fulfil their anti-apoptotic role. In order to investigate in detail how the avian homologue ITA interfered with both TNF induced apoptosis and the NGF mediated differentiation in PC12 cells, a two hybrid screen was performed with a PC12 library using ITA as a bait. The screen resulted in the identification of several overlapping fragments of a previously unknown gene. The complete cDNA for this gene was isolated, the analysis of which revealed a high homology with a large family of tumour antigens known as MAGE (melanoma associated antigens). This newly identified member of the MAGE family, which was later named NRAGE, exhibited some unique characteristics that suggested for the first time a role in normal cellular physiology for this protein family. MAGE proteins are usually restricted in their expression to malignant or tumour cells, however NRAGE was also expressed in terminally differentiated adult tissue. NRAGE also interacted with the human XIAP in direct two-hybrid tests. The interactions observed in yeast cells were confirmed in mammalian cell culture, employing both coimmunoprecipitation and mammalian two-hybrid methods. Moreover, the results of the coimmunoprecipitation experiments indicated that this interaction requires the RING domain. The widely studied 32D cell system was chosen to investigate the effect of NRAGE on apoptosis. NRAGE was stably transduced in 32D cells, and found to augment cell death induced by the withdrawal of Interleukin-3. One reason for this reduced cell viability in NRAGE expressing cells could be the binding of endogenous XIAP, which occurred inducibly after growth factor withdrawal. Interestingly, NRAGE was able to overcome the protection afforded to 32D cells by the exogenous expression of human Bcl-2. Thus NRAGE was identified during this research doctorate as a novel pro-apoptotic, IAP-interacting protein, able to accelerate apoptosis in a pathway independent of Bcl-2 cell protection.
Cardiovascular disease is the leading cause of mortality in both men and women in the Western world. Earlier observations have pointed out that pre-menopausal women have a lower risk of developing cardiovascular disease than age-matched men, with an increase in risk after the onset of menopause. This observation has directed the attention to estrogen as a potential protective factor in the heart. So far the focus of research and clinical studies has been the vascular system, leaving the current knowledge on the role of estrogen in the myocardium itself rather scarce. Functional estrogen receptor-alpha as well as -beta have recently been identified in the myocardium, making the myocardium an estrogen target organ. The focus of this thesis was 1) to investigate the role of estrogen and estrogen receptors in modulating myocardial gene expression both in vivo in an animal model for cardiac hypertrophy (spontaneously hypertensive rats; SHR), as well as in vitro in isolated neonatal cardiomyocytes, 2) to investigate the mechanisms of the rapid induction of an estrogen target gene, the early growth response gene-1 (Egr-1) and 3) to initiate the search for novel estrogen target genes in the myocardium. 1) The effects of estrogen on the expression of one of the major myocardial specific contractile proteins, the alpha-myosin heavy chain (alpha-MHC) have been investigated. In ovarectomised animals treated either with 17beta-estradiol alone or in combination with a specific estrogen receptor antagonist, ICI 182780, it was shown that both alpha-MHC mRNA and protein were upregulated by estrogen in an estrogen receptor specific manner. The in vivo results were confirmed in vitro in isolated neonatal cardiomyocytes which showed that estrogen has a direct action on the myocardium potent enough to upregulate the expression of alpha-MHC. Furthermore it was shown that the alpha-MHC promoter is induced by estrogen in an estrogen receptor-dependent manner and first investigations into the mechanisms involved in this upregulation identified Egr-1 as a potential transcription factor which, upon induction by estrogen, drives the expression of the alpha-MHC promoter. 2) Previously it was shown that Egr-1 is rapidly induced by estrogen in an estrogen receptor-dependent manner which was mediated via 5 serum response elements (SREs) in the promoter region and surprisingly not via the estrogen response elements (EREs). In this study it was shown that estrogen-treatment of cardiomyocytes resulted in the recruitment of serum response factor (SRF), or an antigenically related protein, to the SREs in the Egr-1 promoter, which was specifically inhibited by the estrogen receptor antagonist ICI 182780. Transfection experiments showed that estrogen induced a heterologous promoter consisting only of 5 tandem repeats of the c-fos SRE in an ER-dependent manner, which identified SREs as promoter elements able to confer an estrogen response to target genes. 3) Potentially new target genes regulated by estrogen in vivo were analysed using hearts of ovarectomised animals as well as ovarectomised animals treated with estrogen. Analyses of cDNA microarray filters containing 1250 known genes identified 24 genes that were modified by estrogen in vivo. Among these genes, some might have potentially important functions in the heart and further analyses of these genes will create a more global picture of the role and function of estrogen in the myocardium. Taken together, the results showed that estrogen does have a direct action on the myocardium both by regulating the expression of myocardial specific genes in vivo, as well as exerting rapid non-nuclear effects in cardiac myocytes. It was shown that SREs in the promoter region of genes can confer an estrogen response to genes identifying SREs as important elements in regulation of genes by estrogen. Furthermore, 24 potentially new estrogen targets were identified in the myocardium, contributing to the general understanding of estrogen action in the myocardium.
Unique functions of DNA topoisomerase IIalpha and IIbeta have been suggested. A human cell line which carries a homozygeous mutation of the nuclear localization sequence of the topoisomerase IIalpha gene expresses the isoform outside the nucleus at the onset of mitosis. At mitosis topoisomerase IIbeta diffused away from the chromatin despite the nuclear lack of the IIalpha-form. Chromosome condensation and disjunction was performed with the aid of cytosolic topoisomerase IIalpha which bound to the mitotic chromatin with low affinity. Consequently an increased rate of nondisjunction is observed in these cells. It is concluded that high affinity chromatin binding of topoisomerase IIalpha is essential for chromosome condensation/disjunction and that topoisomerase IIbeta does not adopt these functions. A centrosomal protein was recognized by topoisomerase IIalpha. This topoisomerase IIalpha-like protein resembles a modified form of topoisomerase IIalpha with an apparent size of 205 kDa compared to 170 kDa. The expression of the protein is constant in all stages of the cell cycle and it appears in proliferating as well as in resting cells. If there is not sufficient topoisomerase IIalpha present at mitosis the centrosomal proteins might adopt the function and a mitotic catastrophe in the cells could therefore be prevented.
Monolayer or suspension cell cultures are of only limited value as experimental models for human cancer. Therefore, more sophisticated, three-dimensional culture systems like spheroid cultures or histocultures are used, which more closely mimic the tumor in individual patients compared to monolayer or suspension cultures. As tissue culture or tissue engineering requires more sophisticated culture, specialized in vitro techniques may also improve experimental tumor models. In the present work, a new miniaturized hollow-fiber bioreactor system for mammalian cell culture in small volumes (up to 3 ml) is characterized with regard to transport characteristics and growth of leukemic cell lines (chapter 2). Cell and medium compartment are separated by dialysis membranes and oxygenation is accomplished using oxygenation membranes. Due to a transparent housing, cells can be observed by microscopy during culture. The leukemic cell lines CCRF-CEM, HL-60 and REH were cultivated up to densities of 3.5 x 107/ml without medium change or manipulation of the cells. Growth and viability of the cells in the bioreactor were the same or better, and the viable cell count was always higher compared to culture in Transwellâ plates. As shown using CCRF-CEM cells, growth in the bioreactor was strongly influenced and could be controlled by the medium flow rate. As a consequence, consumption of glucose and generation of lactate varied with the flow rate. Influx of low molecular weight substances in the cell compartment could be regulated by variation of the concentration in the medium compartment. Thus, time dependent concentration profiles (e.g. pharmacokinetic profiles of drugs) can be realized as illustrated using glucose as a model compound. Depending on the molecular size cut-off of the membranes used, added growth factors like GM-CSF and IL-3 as well as factors secreted from the cells are retained in the cell compartment for up to one week. Second, a method for monitoring cell proliferation the hollow-fiber bioreactor by use of the Alamar BlueTM dye was developed (chapter 3). Alamar BlueTM is a non-fluorescent compound which yields a fluorescent product after reduction e.g. by living cells. In contrast to the MTT-assay, the Alamar BlueTM-assay does not lead to cell death. However, when not removed from the cells, the Alamar BlueTM dye shows a reversible, time- and concentration-dependent growth inhibition as observed for leukemic cell lines. When applied in the medium compartment of a hollow-fiber bioreactor system, the dye is delivered to the cells across the hollow-fiber membrane, reduced by the cells and released from the cell into the medium compartment back again. Thus, fluorescence intensity can be measured in medium samples reflecting growth of the cells in the cell compartment. This procedure offers several advantages. First, exposure of the cells to the dye can be reduced compared to conventional culture in plates. Second, handling steps are minimized since no sample of the cells needs to be taken for readout. Moreover, for the exchange of medium, a centrifugation step can be avoided and the cells can be cultivated further. Third, the method allows to discriminate between cell densities of 105, 106 and 107 of proliferating HL-60 cells cultivated in the cell compartment of the bioreactor. Measurement of fluorescence in the medium compartment is more sensitive compared to glucose or lactate measurement for cell counts below 106 cells/ml, in particular. In conclusion, the Alamar BlueTM-assay combined with the hollow-fiber bioreactor offers distinct advantages for the non-invasive monitoring of cell viability and proliferation in a closed system. In chapter 4 the use of the hollow-fiber bioreactor as a tool for toxicity testing was investigated, as current models for toxicity as well as efficacy testing of drugs in vitro allow only limited conclusions with regard to the in vivo situation. Examples of the drawbacks of current test systems are the lack of realistic in vitro tumor models and difficulties to model drug pharmacokinetics. The bioreactor proved to be pyrogen free and is steam-sterilizable. Leukemic cell lines like HL-60 and primary cells such as PHA-stimulated lymphocytes can be grown up to high densities of 1-3 x 107 and analyzed during growth in the bioreactor by light-microscopy. The cytostatic drug Ara-C shows a dose-dependent growth inhibition of HL-60 cells and a dose-response curve similar to controls in culture plates. The bioreactor system is highly flexible since several systems can be run in parallel, soluble drugs can be delivered continuously via a perfusion membrane and gaseous compounds via an oxygenation membrane which also allows to control pO2 and pH (via pCO2) during culture in the cell compartment. The modular concept of the bioreactor system allows realization of a variety of different design properties, which may lead to an improved in vitro system for toxicity testing by more closely resembling the in vivo situation. Whereas several distinct advantages of the new system have been demonstrated, more work has to be done to promote in vitro systems in toxicity testing and drug development further and to reduce the need for animal tests.
This study investigates mechanisms and consequences of sexual selection in a polygynous population of dusky warblers Phylloscopus fuscatus, breeding near Magadan in the Russian Far East. In particular, the study focuses on individual variation in the reproductive behaviours of both females and males. The mating system of this population is characterised by facultative polygyny (17 per cent of the males mated with more than one female), and by an outstandingly high rate of extra-pair paternity (45 per cent of the offspring was not sired by the social partner of the female). The occurrence of polygyny is best explained by the ‘polygyny-threshold model’ (PTM). A novel finding of this study is that female mating decisions follow a conditional strategy. First-year females that have no prior breeding experience prefer monogamy over territory quality, while older females more often mate polygynously. I argue that the costs of receiving no male help may be higher for inexperienced females, while the benefits of having a free choice between territories may be higher for individuals that know which territories had the highest breeding success in previous years. Furthermore, I find support for the existence of two female mating strategies. The ‘emancipated’ female which is not dependent on male help, is free to choose the best territory and the best copulation partners. The ‘help-dependent’ female, in contrast, is bound to find a partner who is willing to assist her with brood care, thus she will have to accept territories and genetic fathers of lesser quality. The most unexpected finding on female mating behaviours is that this dichotomy between emancipated and help-dependent females is accompanied by morphological specialisation, which indicates that there is genetic variation underlying these female mating strategies. Male mating behaviours are characterised by competition for ownership of the best territories and by advertisement of male quality to females, as these are the factors which largely determine male reproductive success. Male success in obtaining copulations depended on the quality of their song, a fact that explains why males spend most of the daytime singing during the period when females are fertile. Individuals that were able to maintain a relatively high sound amplitude during rapid frequency modulations were consistently preferred by females as copulation partners. Studies of physiological limitations on sound production suggest that such subtle differences in male singing performance can provide an honest reflection of male quality. The present study is the first to indicate that females may judge the quality of a male’s song by his performance in sound production. Quality of song was also related to winter survival, which suggests that females can enhance the viability of their offspring by seeking extra-pair fertilisations from good singers (good-genes hypothesis). In general, the present study demonstrates that a complete understanding of avian mating systems is not possible without a detailed analysis of alternative behavioural strategies and of how individuals adjust their reproductive tactics according to their individual needs and abilities.
T cell activation is supposed to require two signals via engagement of the TCR and a costimulatory molecule. However, the signaling cascade of costimulatory molecules has remained elusive. Here, I provide evidence that CD44 supports proliferation as well as apoptosis mainly, if not exclusively, by enhancing signal transduction via the TCR/CD3 complex. Blockade of CD44 interferes with mounting of an immune response. This has been demonstrated by the significantly decreased IL-2 production of a T helper line, when stimulated in the presence of a competing CD44 receptor globulin. To evaluate the underlying mechanism, CD44 was cross-linked by an immobilized antibody (IM7). Cross-linking of CD44 induces proliferation of peripheral T cells and apoptosis of thymocytes and a T helper line in the presence of subthreshold levels of anti-CD3. CD44-induced proliferation was accompanied by an upregulation of the activation markers CD25 and CD69 and an increased cytokine production. TCR-mediated apoptosis was accompanied by an upregulation of CD95 ligand and CD95 receptor, which could be greatly enhanced by costimulation via CD44. On the level of signal transduction, coligation of CD44 with CD3 resulted in a strong and sustained increase of early tyrosine phosphorylation events and upregulated downstream signal transduction pathways, such as the ras/ERK and the JNK signaling cascades. These pleiotropic effects of CD44 are due to its involvement in the most proximal events in TCR signaling, as demonstrated by a strong increase in the phosphorylation of the TCR z-chain and ZAP-70. Notably, cross-linking of CD44 was binding-site dependent and was only effective when supporting colocalization of the TCR/CD3 complex and CD44. Cross-linking of CD44 via immobilized IM7 also induced profound changes in cell morphology, characterized by strong adhesion, spreading and development of surface extensions, which were dependent on a functional tubulin and actin cytoskeleton. These cytoskeletal rearrangements were mediated by rac1, a small GTPase of the rho subfamily, and src-family kinases, two of which, fyn and lck, were found to be associated with CD44. By cross-linkage of CD44 these kinases were redistributed into so called lipid rafts. It is supposed that for T cell activation a relocation of the TCR/CD3 complex into the same membrane microdomains is required. The data are interpreted in the sense that the costimulatory function of CD44 relies on its cooperativity with the TCR. Most likely by recruitment of phosphokinases CD44 significantly lowers the threshold for the initiation of signaling via the TCR. The requirement for immobilized anti-CD44, the necessity for neighbouring anti-CD3 and the dependence on the binding site of CD44 strongly suggest that the costimulatory mechanism involves cytoskeletal rearrangements, which facilitate recruitment and redirection of src-family protein kinases in glycolipid enriched membrane microdomains.
The present thesis reports on four years of field research on stingless bee ecology in Sabah, Malaysia. Hereby, it was the main focus to evaluate the effect of selective logging for timber extraction on communities of bees, and to elucidate causative relationships involved in regulating bee populations. Included were background studies on resource use (3.1, 3.2, 3.3) and nesting biology (3.4) as well as comparative studies on stingless bee diversity and abundance in logged and unlogged lowland rainforest sites (4.1, 4.2). Stingless bees proved to be generalist foragers that used a large range of plant species as pollen sources. Nevertheless, different species of bees had rather distinct pollen diets, a findind that was independent of fluctuations in flowering activity in the habitat. At one particular point in time colonies of one species (Trigona collina)collected mold spores (Rhizopus sp.) as a pollen surrogate. In order to obtain low-effort estimates of meliponine pollen sources a new method was developed: Trapping of bee garbage (with funnel traps) and the quantitative analysis of pollen in garbage samples. Pollen in bee garbage reflected pollen import with a certain time lag and could therefore be used for an assessment of long-term pollen foraging (see below). The majority of stingless bee nests (275 nests of 12 species) were found in cavities in trunks or under the bases of large, living canopy trees. Nest trees mostly belonged to commercial species and were of the correct size and (partly) timber quality to warrant harvesting. It was estimated that roughly one third of stingless bee nests in an given forest area would be killed during a selective logging operation. Besides causing direct mortality, logging may also indirectly affect bee populations by reducing the availability of potential nest sites (trees). However, in a comparison of primary and differentially logged forest sites (10 to 30 years after logging) no effect of the degree of disturbance on meliponine nest density was found. Instead, the variation in nest density (0 to 16.2 nest/ha) was best explained by differences in the available floral resources (assessed by analysis of pollen in bee garbage). Bee populations in forest edge situations were favored: there was a positive correlation between nest density and the proportion of external non-forest pollen (e.g. from crop plants, road edge vegetation, mangroves) in the bees’ diet. The highest nest density was found in a site bordering the mangroves in Sandakan Bay. Here, the mangrove tree Rhizophora apiculata represented a extraordinary large fraction of the pollen volume. Presumably, external pollen sources effectively supplement bee diets at times when little flowering occurs inside the forest, thus increasing overall bee carrying-capacity. The idea of differential pollen limitation was strengthened by direct measurements of pollen import and foraging activity over a period of five months. Both were elevated in colonies in a site with high bee density. It is concluded that the abundance of stingless bees in forests in Sabah is chiefly dependent on the local availability of food resources. Hereby, bee populations strongly benefit from edge effects and increased habitat diversity. Although direct negative effects of selective logging are strongly indicated by a close association of bee nests with commercial trees, no clear effects were detected in regenerating forests ten to 30 years after logging.
The MEK5/ ERK5 kinase module is a relatively new discovered mitogen-activated protein kinase (MAPK) signalling pathway with a poorly defined physiological function. Since ERK5 and its upstream activator MEK5 are abundant in skeletal muscle a function of the cascade during muscle differentiation was examined. ERK5 becomes activated upon induction of differentiation in mouse myoblasts. The selective activation of the pathway results in promoter activation of differentiation-specific genes, such as the cdk-inhibitor p21 gene, the myosin light chain (MLC1A) gene, or an E-box containing promoter element, where myogenic basic-helix-loop-helix proteins such as MyoD or myogenin bind. Moreover, myogenic differentiation is completely blocked, when ERK5 expression is inhibited by antisense RNA. The effect can be detected also on the expression level of myogenic determination and differentiation markers such as p21, MyoD and myogenin. Another new finding is that stable expression of ERK5 in C2C12 leads to differentiation like phenotype and to increased p21 expression levels under growth conditions. These results provide first evidence that the MEK5/ERK5 MAP kinase cascade is critical for early steps of muscle cell differentiation.
Food borne pathogens that cause systemic disease must cross the intestinal barrier. Many of these pathogens, eg Salmonella typhimurium and Shigella flexneri, use M cells, found only within the follicle associated epithelium (FAE) that overlies Peyer’s patches and other lymphoid follicles, to enter the host. This study is primarily an investigation into the interaction of S. typhimurium and Listeria monocytogenes with the intestinal epithelium, representing the early stage of an infection.
The mode of action of phloretin and its analogs on the permeability of natural membranes for neutral and charged molecules, such as urea, glucose and chloride has been characterized 25 years ago. In contrast to signal molecules with primary effects on transport systems of natural membranes, phloretin also affects model membranes, i.e., artificial membranes, which do not contain proteins. Since the dipole potential reducing effect of phloretin on mono- and bilayers has been found, it became clear that its primary effect must be a biophysical one: phloretin adsorbs to lipid layers and changes biophysical parameters of these layers. The aim of this work was the characterization of the interaction between the surface-active molecule phloretin and artificial lipid layers. We were able to describe structural and functional parameters of the model systems mono- and bilayer as functions of one or few variables. One of these parameters, the dipole potential, measured as a function of the aqueous phloretin concentration, allowed a critical examination of the Langmuir adsorption model that has been postulated for the interaction between phloretin and lipid layers. Surface pressure versus area per lipid molecule isotherms and surface (dipole) potential change versus area per lipid molecule isotherms, measured at lipid monolayers, allowed a structural description of the phloretin-lipid interaction: phloretin integrates into monolayers dependent on the surface pressure and the phase state of the lipid. Calorimetric measurements confirmed the integration of phloretin into membranes because of the strong decrease of the phase transition temperature, but they also showed that the cooperativity of phase transition is hardly affected, even at very high amounts of phloretin in the membrane. Obviously the interaction between phloretin and lipids is restricted to the head groups, an integration into the hydrocarbon layer is unlikely. 2H NMR measurements with spherical unilamellar vesicles of headgroup-deuterated lipid showed changed quadrupolar splittings indicating the interaction between phloretin and headgroups of the lipids.
Large parts of the tropical lowland rain forests of Sabah (Malaysia) were transformed into secondary forests due to heavy logging. Additionally the remaining forest remnants are isolated from each other by large scale oil palm plantations. Biodiversity patterns and responses of the community of leaf litter ants were studied in anthropogenically disturbed habitats and primary forests of different size. In logged over forests, only 70 per cent of the species of a primary forest were present even 25 years after timber extraction. The ant communities were thinned and could be described by a lower species density producing lower species numbers and a different community composition. The similarity in species number and community composition between logged over forests of different degrees of disturbance was explained by source-sink dynamics within a heterogeneous forest matrix. Rain forest fragments displayed even higher reductions in species density, numbers and diversity due to a more pronounced thinning effect. Even forest isolates exceeding 4 000 ha in size did not support more than 50 per cent of the species of the leaf litter ant community of a contiguous primary rain forest. Additionally, an increase in tramp species was recorded with decreasing size of the forest fragments, leading to a very different community composition. Regarding the leaf litter ant community, the remaining rain forest fragments of Sabah are effectively isolated by a barrier of oil palm plantation, now stretching all over the lowlands of the east coast. Only 13 species, which belonged to the forest ant community in highly disturbed areas were collected in these plantations. Some of the 10 other species of the highly reduced ground-dwelling ant community in the plantations are known as invasive tramp species, forming large exclusive territories. Correlative evidence and a field experiment implied, that leaf litter humidity, volume and temperature affect the distribution and community composition of forest leaf litter ant species. The smaller primary forests and the most disturbed logged over forests in this study revealed higher temperatures and lower humidity levels and a reduction in leaf litter volume compared to a large primary forest or forests affected by a lower impact of timber harvesting. If the pattern for leaf litter ants is confirmed for other taxa, the implications for any efficient management design aiming to preserve the majority of the biodiversity of the country are tremendous and current concepts need rethinking.
Most natural learning situations are of a complex nature and consist of a tight conjunction of the animal's behavior (B) with the perceived stimuli. According to the behavior of the animal in response to these stimuli, they are classified as being either biologically neutral (conditioned stimuli, CS) or important (unconditioned stimuli, US or reinforcer). A typical learning situation is thus identified by a three term contingency of B, CS and US. A functional characterization of the single associations during conditioning in such a three term contingency has so far hardly been possible. Therefore, the operational distinction between classical conditioning as a behavior-independent learning process (CS-US associations) and operant conditioning as essentially behavior-dependent learning (B-US associations) has proven very valuable. However, most learning experiments described so far have not been successful in fully separating operant from classical conditioning into single-association tasks. The Drosophila flight simulator in which the relevant behavior is a single motor variable (yaw torque), allows for the first time to completely separate the operant (B-US, B-CS) and the classical (CS-US) components of a complex learning situation and to examine their interactions. In this thesis the contributions of the single associations (CS-US, B-US and B-CS) to memory formation are studied. Moreover, for the first time a particularly prominent single association (CS-US) is characterized extensively in a three term contingency. A yoked control shows that classical (CS-US) pattern learning requires more training than operant pattern learning. Additionally, it can be demonstrated that an operantly trained stimulus can be successfully transferred from the behavior used during training to a new behavior in a subsequent test phase. This result shows unambiguously that during operant conditioning classical (CS-US) associations can be formed. In an extension to this insight, it emerges that such a classical association blocks the formation of an operant association, which would have been formed without the operant control of the learned stimuli. Instead the operant component seems to develop less markedly and is probably merged into a complex three-way association. This three-way association could either be implemented as a sequential B-CS-US or as a hierarchical (B-CS)-US association. The comparison of a simple classical (CS-US) with a composite operant (B, CS and US) learning situation and of a simple operant (B-US) with another composite operant (B, CS and US) learning situation, suggests a hierarchy of predictors of reinforcement. Operant behavior occurring during composite operant conditioning is hardly conditioned at all. The associability of classical stimuli that bear no relation to the behavior of the animal is of an intermediate value, as is operant behavior alone. Stimuli that are controlled by operant behavior accrue associative strength most easily. If several stimuli are available as potential predictors, again the question arises which CS-US associations are formed? A number of different studies in vertebrates yielded amazingly congruent results. These results inspired to examine and compare the properties of the CS-US association in a complex learning situation at the flight simulator with these vertebrate results. It is shown for the first time that Drosophila can learn compound stimuli and recall the individual components independently and in similar proportions. The attempt to obtain second-order conditioning with these stimuli, yielded a relatively small effect. In comparison with vertebrate data, blocking and sensory preconditioning experiments produced conforming as well as dissenting results. While no blocking could be found, a sound sensory preconditioning effect was obtained. Possible reasons for the failure to find blocking are discussed and further experiments are suggested. The sensory preconditioning effect found in this study is revealed using simultaneous stimulus presentation and depends on the amount of preconditioning. It is argued that this effect is a case of 'incidental learning', where two stimuli are associated without the need of reinforcement. Finally, the implications of the results obtained in this study for the general understanding of memory formation in complex learning situations are discussed.
The proventriculus regulates the food passage from crop to midgut. As the haemolymph provides a constantly updated indication of an insect’s nutritional state, it is assumed that the factor controlling the proventri-culus activity is to be found in the haemolymph. The purpose of this doctoral thesis was to investigate how output (metabolic rate), input (food quality and food quantity) and internal state variables (haemolymph osmolarity and haemolymph sugar titer) affect each other and which of these factors controls the activity of the proventriculus in the honeybee. Therefore free-flying foragers were trained to collect con-trolled amounts of different sugar solutions. Immediately after feeding, metabolic rates were measured over different periods of time, then crop-emptying rates and haemolymph sugar titers were measured for the same individual bees. Under all investigated conditions, both the sugar transport rates through the proventriculus and the haemolyph sugar titers depended mainly on the metabolism. For bees collecting controlled amounts of 15 per cent, 30 per cent or 50 per cent sucrose solution haemolymph trehalose, glucose and fructose titers were constant for metabolic rates from 0 to 4.5 mlCO2/h. At higher metabolic rates, trehalose concentration decreased while that of glucose and fructose increased with the exception of bees fed 15 per cent sucrose solution. As the supply of sugar from the crop via the proventriculus was sufficient to support even the highest metabolic rates, the observed pattern must result from an upper limit in the capacity of the fat body to synthesise trehalose. The maximal rate of conversion of glucose to trehalose in the fat body was therefore calculated to average 92.4 µg glucose/min. However, for bees fed 15 per cent sucrose solution both the rate of conversion of glucose to trehalose and the rate of sugar transport from the crop to the midgut were limited, causing an overall decrease in total haemolymph sugar titers for metabolic rates higher than 5 mlCO2/h. Haemolymph sucrose titers were generally low but increased with increasing metabolic rates, even though sucrose was not always detected in bees with high metabolic rates. Though foragers were able to adjust their sugar transport rates precisely to their metabolic rates, a fixed surplus of sugars was transported through the proventriculus under specific feed-ing conditions. This fixed amount of sugars increased with increasing concentration and in-creasing quantity of fed sugar solution, but decreased with progressing time after feeding. This fixed amount of sugars was independent of the metabolic rates of the bees and of the molarity and viscosity of the fed sugar solution. As long as the bees did not exhaust their crop content, the haemolymph sugar titers were unaffected by the sugar surplus, by the time after feeding, by the concentration and by the viscosity of fed sugar solution. When bees were fed pure glucose (or fructose) solutions, un-usually little fructose (or glucose) was found in the haemolymph, leading to lower total haemolymph sugar titers, while the trehalose titer remained unaffected. In order to investigate the mechanisms underlying the regulation of the honeybee proven-triculus, foraging bees were injected either with metabolisable (glucose, fructose, trehalose), or non-metabolisable sugars (sorbose). Bees reacted to injections of metabolisable sugars with reduced crop-emptying rates, but injection of non-metabolisable sugars had no influence on crop emptying. Therefore it is concluded that the proventriculus regulation is controlled by the concentration of metabolisable compounds in the haemolymph, and not by the haemo-lymph osmolarity. A period of 10min was enough to observe reduced crop emptying rates after injections. It is suggested that glucose and fructose have an effect on the proventriculus activity only via their transformation to trehalose. However, when the bees were already in-jected 5min after feeding, no response was detectable. In addition it was investigated whether the overregulation is the result of feed-forward regulation for the imminent take-off and flight. In a first experiment, we investigated whether the bees release an extra amount of sugar solution very shortly before leaving for the hive. In a second experiment, it was tested whether the distance covered by the bees might have an influence on the surplus amount released prior to the take-off. In a third experiment, it was investigated if walking bees fail to release this extra amount of sugars, as they do not have to fly. Though we were not able to demonstrate that the overregulation is the result of feed-forward regulation for the imminent take-off and flight, it is conceivable that this phenome-non is a fixed reaction in foragers that can not be modulated. To investigate whether regulated haemolymph sugar titers are also observed in honeybee foragers returning from natural food sources, their crop contents and haemolymph sugar titers were investigated. While the quantity of the collected nectar was without influence on the haemolymph sugar titers, foragers showed increasing haemolymph sugar titers of glucose, fructose and sucrose with increasing sugar concentration of the carried nectar. In contrast no relationship between crop nectar concentrations and haemolymph trehalose titers was observed. We are sure that the regulation of food passage from crop to midgut is controlled by the trehalose titer. However, under some conditions the balance between consumption and income is not numerically exact. This imprecision depends on the factors which have an impact on the foraging energetics of the bees but are independent of those without influence on the foraging energetics. Therefore we would assume that the proventriculus activity is modulated by the motivational state of the bees.
Different transgenes that can be expressed in neurons to kill or block them were compared. Tetanus neurotoxin blocked chemical synapses very efficiently. Synapses consisting of a chemical and an electrical component were blocked more reliably by expressing a human inwardly rectifying potassium channel. To gain temporal control over neuronal function, three genetic tools have been investigated. None of the systems is without drawbacks, however, the recombination induced tetanus neurotoxin expression is a promising approach. The knowledge gained from the comparative methodological study was used to investigate the role of neurons in sensory systems in processing different sensory informations. Receptor neurons sensitive for chemical or mechanical stimuli were correlated to specific olfactory behaviors or locomotor tasks. The main topic of this thesis is the much discussed question of which neurons are involved in motion processing in the visual system of flies. Neither L2 nor L4 neurons in the first visual neuropil are essential for motion-detection. The results indicate that maybe motion is detected by the network of amacrine cells (a). The vertical motion-sensitive VS cells in the lobula plate are not necessary for behavioral responses to vertical motion. This finding implies that the lack of VS cells in the structural mutant optomotor blind is not causally related to the altered responses to motion stimuli. Other abnormalities in optomotor blind are responsible for this behavioral phenotype. This work shows the potential of the described methods in studying information processing in the Drosophila brain. Groups of neurons were correlated to complex behavioral responses and theories about information processing were tested by behavioral experiments with transgenic flies. The refinement of the genetic tools to interfere with neuronal function will make the Drosophila brain an even better model to study information processing in nervous systems.
Recent advances in the development of immunoassays and nucleic acid assays have improved the performance and increased the sensitivity of sensors that are based on biochemical recognition. The new approaches taken by researchers include detecting pathogens by detecting their nucleic acids, using new nontoxic reporter entities for generating signals, and downscaling and miniaturizing sensors to micromigration and microfluidic formats. This dissertation connects some of these successful approaches, thereby leading to the development of novel nucleic acid sensors for rapid and easy detection of pathogens. The author's goal was to develop diagnostic tools that enable investigators to detect pathogens rapidly and on site. While the sensors can be used to detect any pathogen, the author first customized them for detecting particularly Cryptosporidium parvum, a pathogen whose detection is important, yet presents many challenges. Chapter 2 of this thesis presents a novel test-strip for the detection of C. parvum. The test-strip is designed to detect nucleic acids rather than proteins or other epitopes. While test strips are commonly used for sensors based on immunological recognition, this format is very new in applications in which nucleic acids are detected. Further, to indicate the presence or absence of a specific target on the test strip, dye-entrapped, oligonucleotide-tagged liposomes are employed. Using liposomes as reporter particles has advantages over using other reporter labels, because the cavity that the phospholipidic membranes of the liposomes form can be filled with up to 106 dye molecules. By using heterobifunctional linkers liposomes can be tagged with oligonucleotides, thereby enabling their use in nucleic acid hybridization assays. The developed test-strip provides an internal control. The limit of detection is 2.7 fmol/mL with a sample volume of 30 mL. In chapter 3 the detection of nucleic acids by means of oligonucleotide-tagged liposomes is scaled down to a microfluidic assay format. Because the application of biosensors to microfluidic formats is very new in the field of analytical chemistry, the first part of this chapter is devoted to developing the design and the method to fabricate the microchip devices. The performance of the microchips is then optimized by investigating the interactions of nucleic acids and liposomes with the material the chips consist of and by passivating the surface of the chips with blocking reagents. The developed microfluidic chip enabled us to reduce the sample volume needed for one assay to 12.5 mL. The limit of detection of this assay was determined to be 0.4 fmol/mL. Chapters 4 and 5 expand on the development of the microfluidic assay. A prototype microfluidic array that is able to detect multiple analytes in a single sample simultaneously is developed. Using such an array will enable investigators to detect pathogens that occur in the same environment, for example, C. parvum and Giardia duodenalis by conducting a single test. The array's ability to perform multiple sample analysis is shown by detecting different concentrations of target nucleic acids. Further, the author developed a microfluidic chip in which interdigitated microelectrode arrays (IDAs) that consist of closely spaced microelectrodes are integrated. The IDAs facilitate electrochemical detection of cryptosporidial RNA. Electrochemical detection schemes offer benefits of technical simplicity, speed, and sensitivity. In this project liposomes are filled with electrochemically active molecules and are then utilized to generate electrochemical signals. Chapter 6 explores the feasibility of liposomes for enhancing signals derived from nucleic acid hybridization in surface plasmon resonance (SPR) spectroscopy. SPR spectroscopy offers advantages because nucleic acid hybridization can be monitored in real time and under homogeneous conditions because no washing steps are required. SPR spectroscopy is very sensitive and it can be expected that, in the future, SPR will be integrated into microfluidic nucleic acid sensors.