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- Julius-von-Sachs-Institut für Biowissenschaften (25)
Sonstige beteiligte Institutionen
- Helmholtz Institute for RNA-based Infection Research (HIRI) (7)
- Universitätsklinikum Münster (3)
- Rudolf Virchow Center for Integrative and Translational Bioimaging, University of Würzburg (2)
- Zentrum für Infektionsforschung (ZINF) Würzburg (2)
- Bio-Imaging Center Würzburg (1)
- Biomedical Center Munich, Department of Physiological Chemistry, Ludwig-Maximilians-Universität München (1)
- CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - the development agency of the Brazilian Federal Government (1)
- CBIO, University of Cape Town, South Africa (1)
- Carl-Ludwig-Institut für Physiologie, Universität Leipzig (1)
- Chair of Experimental Biomedicine I (1)
Kürzlich wurden bei immunvermittelten Neuropathien Autoantikörper gegen Proteine
des paranodalen axoglialen Komplexes beschrieben. Deren Charakteristika,
Prävalenzen, pathophysiologische Relevanz sowie Bedeutung für Diagnostik
und Therapie sind jedoch noch nicht abschließend erforscht.
In dieser Studie wurden daher Seren und Plasmapheresematerial (PE-Material)
von 150 Patienten mit inflammatorischen Neuropathien, nämlich 105 mit chronisch
inflammatorischer demyelinisierender Polyneuropathie (CIDP), 21 mit Guillain-
Barré-Syndrom (GBS) und 24 mit multifokaler motorischer Neuropathie
(MMN), welche etablierte diagnostische Kriterien der jeweiligen Krankheit erfüllen,
sowie 74 Kontrollen mittels immunhistochemischen Färbungen an murinen
Zupfnervenpräparaten und/oder ELISA (Enzyme-linked Immunosorbent Assay)
auf Autoantikörper gegen die paranodalen Proteine Caspr, Contactin-1 und Neurofascin-
155 untersucht. Bei positivem Ergebnis wurde deren Spezifität mittels
immunhistochemischen Färbungen an transfizierten HEK (Human embryonic kidney)-
293-Zellen und Präinkubationsversuchen bestätigt. Es wurden die IgG-Subklassen
und die Antikörpertiter bestimmt und das Komplementbindungsverhalten
unter Zugabe von intravenösen Immunglobulinen (IVIG) mit zellbasierten und
ELISA-basierten Methoden analysiert. Klinische Merkmale und das Therapieansprechen
Antikörper-positiver Patienten wurden ermittelt und mit den experimentellen
Ergebnissen in Zusammenhang gesetzt.
IgG-Autoantikörper gegen Contactin-1 konnten bei vier Patienten mit CIDP nachgewiesen
werden, IgG-Autoantikörper gegen Caspr bei einem Patienten mit
CIDP und einer Patientin mit GBS. Es konnten keine weiteren Autoantikörper bei
CIDP-Patienten, GBS-Patienten, MMN-Patienten oder bei den Kontrollen detektiert
werden. Die Prävalenz von Autoantikörpern gegen axogliale paranodale Proteine
liegt somit in dieser Studie bei jeweils 4,76% bei CIDP und GBS und 0%
bei MMN. Die Antikörper gehörten bei Patienten in der akuten Erkrankungsphase
(zwei der CIDP-Patienten mit Anti-Contactin-1-Autoantikörpern und eine GBS-Patientin mit Anti-Caspr-Autoantikörpern) hauptsächlich den Subklassen IgG1
und IgG3 an, bei Patienten in der chronischen Phase (zwei der CIDP-Patienten
mit Anti-Contactin-1-Autoantikörpern, ein CIDP-Patient mit Anti-Caspr-Autoantikörpern)
überwog die Subklasse IgG4. Experimentell kam es zur Komplementbindung
und -aktivierung abhängig vom Gehalt der Subklassen IgG1-3, nicht
aber IgG4; diese konnte durch die Zugabe von IVIG dosisabhängig gemindert
werden. Alle Autoantikörper-positiven CIDP-Patienten zeigten einen GBS-artigen
Beginn mit einer schweren motorischen Beteiligung. Anti-Contactin-1-positive
Patienten kennzeichnete klinisch zusätzlich das Vorkommen einer Ataxie und eines
Tremors, Anti-Caspr-positive Patienten das Vorkommen starker neuropathischer
Schmerzen. Elektrophysiologisch standen neben Hinweisen auf eine Leitungsstörung
Zeichen einer axonalen Schädigung im Vordergrund. Als histopathologisches
Korrelat lagen eine nodale Architekturstörung und ein Axonverlust
vor. Die Patienten zeigten nur in der Anfangsphase der Erkrankung ein Ansprechen
auf IVIG. Bei drei CIDP-Patienten mit IgG4-Autoantikörpern (zwei Patienten
mit Anti-Contactin-1-Antikörpern und ein Patient mit Anti-Caspr-Antikörpern)
wurde eine Therapie mit Rituximab durchgeführt. Diese führte zu einer Titerreduktion
und zur zeitgleichen klinischen und elektrophysiologischen Befundbesserung
bei zwei Patienten.
Die in dieser Arbeit angewandten Screeningmethoden führten zum erfolgreichen
Nachweis von Autoantikörpern gegen paranodale axogliale Proteine. Die Patienten
mit positivem Autoantikörpernachweis definieren eine kleine Untergruppe mit
ähnlichen klinischen Merkmalen im Kollektiv der Patienten mit inflammatorischen
Polyneuropathien. Histopathologische Merkmale sowie das Therapieansprechen
auf antikörperdepletierende Therapie sprechen in Kombination mit den Ergebnissen
weiterer Studien zu paranodalen Autoantikörpern für eine pathogenetische
Relevanz der Autoantikörper. Mit einem charakteristischen, am Schnürring ansetzenden
Pathomechanismus könnten Neuropathien mit Nachweis von paranodalen
Autoantikörpern der kürzlich eingeführten Entität der Nodo-Paranodopathien
angehören. Die Komplementaktivierung und das Therapieansprechen der Patienten auf IVIG stehen möglicherweise in Zusammenhang mit der prädominanten
IgG-Subklasse. Diese könnte auch in Bezug auf die Chronifizierung eine
Rolle spielen. Der Nachweis von Autoantikörpern gegen paranodale Proteine hat
wohlmöglich in Zukunft direkte Konsequenzen auf das diagnostische und therapeutische
Prozedere bei Patienten mit CIDP und GBS; weitere klinische und experimentelle
Daten aus größeren, prospektiven Studien sind jedoch zum weiteren
Verständnis und zur Charakterisierung dieser Entität notwendig.
Infektionen durch C. albicans auf den Schleimhäuten sind eine häufige Erkrankung bei Patienten mit einer Schwächung der T-Zellimmunität. Blutstrominfektionen mit der Hefe C. albicans (Candidämie) stellen, vor allem bei Patienten auf Intensivstationen, eine nach wie vor bedrohliche Komplikation mit hoher Letalität dar.
Das pH-regulierte Antigen 1 (Pra1) ist ein Protein, das von C. albicans produziert wird, auf der Oberfläche des Pilzes gebunden vorkommt und auch vom Pilz in den Überstand sezerniert wird. Im humanen System bindet das Protein an T-Zellen an das Oberflächenprotein CD46. Es ist des Weiteren bekannt, dass das Pra1 an bestimmte Immunzellen der Maus (Monozyten und Phagozyten) binden kann. Eine Bindung an T-Zellen der Maus ist bisher nicht beschrieben. Eine genaue Charakterisierung der Interaktion von Pra1 mit Immunzellen der Maus ist interessant, da die Maus als biologischer Modellorganismus zur Erforschung der Infektion mit C. albicans dient. In dieser Arbeit konnte gezeigt werden, dass rekombinantes Pra1 (rPra1) auch an Maus-CD4+ T-Zellen binden kann.
Es wurden Einflussfaktoren auf die gefundene Bindung von Pra1 an CD4+ T- Zellen gesucht. Als ein Einflussfaktor wurde Zink identifiziert. Pra1 kann an freies Zink binden und durch Zugabe von ZnCl2 während der Inkubation von Pra1 mit T-Zellen kann das Signal von gebundenem Pra1 an CD4+ T-Zellen erhöht werden. Aspf2, ein Protein aus Aspergillus fumigatus mit großer Homologie zu Pra1, kann nicht an diese Zellen binden.
Im in-vivo-Experiment mit Tieren, die mit C. albicans infiziert wurden, konnte kein wildtypisches sezerniertes Pra1 gebunden an T-Zellen nachgewiesen werden. Zellkulturüberstände von C. albicans zeigten nach Inkubation in vitro mit T-Zellen ein Signal für gebundenes Pra1 an CD4+ T-Zellen.
Die Bindungskinetik von Pra1 an T-Zellen zeigte eine über die Zeit der Inkubation konstante Zunahme des Signals von zellgebundenem rPra1 an CD4+ T-Zellen. In der off-Kinetik fand sich eine Abnahme des Signals über die Zeit bis an die Grenze der Nachweisbarkeit.
Der Bindungspartner von Pra1 auf T-Zellen konnte nicht identifiziert werden. Die strukturell und funktionell verwandten Oberflächenproteine Crry, CD59a und CD55 wurden auf Bindungsfähigkeit an T-Zellen in entsprechenden Knockout- Mäusen getestet, konnten jedoch als Rezeptor für Pra1 ausgeschlossen werden. Durch die Bindung von sezerniertem Pra1 an neutrophile Granulozyten wird die Fähigkeit dieser Zellen zur Phagozytose eingeschränkt. Die Bindung von Pra1 an CD4+ T-Zellen führt zur Kostimulation der T-Zellen, also zur verstärkten Zellaktivierung und Proliferation. Durch die Zugabe von 10 μM Zinkchlorid wird die kostimulatorische Aktivität von Pra1 verstärkt.
Während der Zellaktivierung von Effektor-Memory-CD4+ T-Zellen reduziert rPra1 die Sekretion von IFN-γ. Diese Reduktion von IFN-γ-produzierenden Zellen entsteht nicht durch einen Einfluss von Pra1 während der Zellaktivierung von naiven CD4+ T-Zellen zu Th1-Zellen und auch nicht durch die Auslösung von Apoptose in IFN-γ-produzierenden Th1-Zellen. Die Bindung von Pra1 an CD4+- T-Zellen, die über den T-Zell-Rezeptor aktiviert werden, reduziert in vitro die Sekretion des Zytokins. Zusätzlich werden weitere Zytokine in ihrer sezernierten Menge reduziert wie IL-2 und TNF-α.
The present study was conducted on the rOCT1, a member of SLC22 family. Structurally, it consists of 12 membrane spanning α-helices with both N- and C-termini intracellular. Studies done so far, through tracer uptake and inhibition, reconstitution of rOCT1 in nanodiscs and proteoliposomes and voltage-clamp fluorometry, have identified the main amino acids in the cleft of rOCT1 that interact in a critical manner with the substrates/inhibitors either directly or indirectly. Homology modeling studies have also supported these observations. In the present study we aimed at measuring the binding of substrates MPP+ and TEA+ to rOCT1 at 0oC in order to establish the amino acids in the cleft region that interact with the substrate when the transporter is frozen in the outward-open conformation. Previously identified crucial amino acids (Asp475, Phe160, Leu447, Arg440, Trp218 and Tyr222) were selected for the study. rOCT1 wild-type and its mutants were stably expressed in HEK293 cells and these cells were used for the binding measurements with the radioactive substrate (MPP+ or TEA+) at 0°C in Mg-Ca-PBS buffer as described in “Materials and Methods” section in detail. rOCT1 wild-type revealed for MPP+-binding a KD which was not significantly different from the corresponding Km value. Also, after addition of 10 nM non-radioactive MPP+, an initial increase of about 20% in bound MPP+ was observed. The results indicate that the Km for transport is dependent on the binding of MPP+ to the outward-open conformation and hints at the possibility of allosteric interaction between the binding sites. Mutations at position Trp218, Phe160 and Asp475 resulted in a change in the KD value. Trp218 mutations also showed an allosteric increase similar to the rOCT1 wild-type. This study suggests that these amino acids are located at a critical position in the outward-open conformation for MPP+ transport. TEA+-binding could not be observed in rOCT1 wild-type, indicating that the binding site is perhaps inaccessible for TEA+ in frozen outward-open state. The mutants D475E, F160A, L447F, R440K and Y222F showed a very low affinity binding with a very high KD value as compared to the corresponding Km values indicating that the transporter might have different affinities for extra-cellular binding alone and for the complete transport process especially if temperature is the limiting factor. Substrate inhibition studies done using both MPP+ and TEA+ have confirmed the existence of overlapping binding sites for these two ligands. This study has confirmed the direct interaction of Trp218, Phe160, Asp475 with MPP+ and Phe160, Asp475, Leu447, Arg440 and Tyr222 with TEA+ in the outward-open conformation.
The obligate intracellular pathogen Chlamydia trachomatis is the causative agent of
trachoma related blindness and the sexually transmitted pelvic inflammatory disease.
Being an obligate intracellular pathogen, C. trachomatis has an intricate dependency
on the survival of the host cell. This relationship is indispensible owing to the fact that
the pathogen spends a considerable fraction of its biphasic lifecycle within a
cytoplasmic vacuole inside the host cell, the so-called chlamydial inclusion. The
cellular apoptotic-signalling network is governed by several finely tuned regulatory
cascades composed of pro- and anti-apoptotic proteins that respond to changes in
the cellular homeostasis. In order to facilitate its intracellular survival, Chlamydia has
been known to inhibit the premature apoptosis of the host cell via the stabilization of
several host anti-apoptotic proteins such as cIAP2 and Mcl-1. While the pro- and
anti-apoptotic proteins are the major regulators of the host apoptotic signalling
network, a class of the small non-coding RNAs called microRNAs (miRNAs) has
increasingly gained focus as a new level of regulatory control over apoptosis.
This work investigates the changes in the host miRNA expression profile post
Chlamydia infection using a high throughput miRNA deep sequencing approach.
Several miRNAs previously associated with the modulation for apoptotic signalling
were differentially expressed upon Chlamydia infection in human endothelial cells. Of
the differentially regulated miRNAs, miR-30c-5p was of particular interest since it had
been previously shown to target the tumor suppressor protein p53. Our lab and
others have previously demonstrated that Chlamydia can downregulate the levels of
p53 by promoting its proteasomal degradation. This work demonstrates that
Chlamydia infection promotes p53 downregulation by increasing the abundance of
miR-30c-5p and a successful infection cycle is hindered by a loss of miR-30c-5p.
Over the last decade, dedicated research aimed towards a better understanding of
apoptotic stimuli has greatly improved our grasp on the subject. While extrinsic
stress, deprivation of survival signals and DNA damage are regarded as major
proponents of apoptotic induction, a significant responsibility lies with the
mitochondrial network of the cell. Mitochondrial function and dynamics are crucial to
cell fate determination and dysregulation of either is decisive for cell survival and
pathogenesis of several diseases. The ability of the mitochondrial network to perform
its essential tasks that include ATP synthesis, anti-oxidant defense, and calcium
homeostasis amongst numerous other processes critical to cellular equilibrium is tied
closely to the fission and fusion of individual mitochondrial fragments. It is, thus,
8
unsurprising that mitochondrial dynamics is closely linked to apoptosis. In fact, many
of the proteins involved regulation of mitochondrial dynamics are also involved in
apoptotic signalling. The mitochondrial fission regulator, Drp1 has previously been
shown to be transcriptionally regulated by p53 and is negatively affected by a miR-
30c mediated inhibition of p53. Our investigation reveals a significant alteration in the
mitochondrial dynamics of Chlamydia infected cells affected by the loss of Drp1. We
show that loss of Drp1 upon chlamydial infection is mediated by the miR-30c-5p
induced depletion of p53 and results in a hyper-fused architecture of the
mitochondrial network.
While it is widely accepted that Chlamydia depends on the host cell metabolism for
its intracellular growth and development, the role of mitochondria in an infected cell,
particularly with respect to its dynamic nature, has not been thoroughly investigated.
This work attempts to illustrate the dependence of Chlamydia on miR-30c-5p induced
changes in the mitochondrial architecture and highlight the importance of these
modulations for chlamydial growth and development.
Fabry disease (FD) is an X-linked lysosomal storage disorder with intracellular accumulation of globotriaosylceramide (Gb3) due to α-galactosidase A deficiency. We studied α-galactosidase A knockout mice (GLA KO) as a model for sensory disturbance and pain in FD.
Pain associated behavior of young (3 months) and old (≥18 months) GLA KO mice and wildtype (WT) littermates in an inflammatory and a neuropathic pain model was investigated. Furthermore, affective and cognitive behavior was assessed in the naïve state and in an inflammatory pain model. Gene and protein expression of pain associated ion channels and Gb3 accumulation in dorsal root ganglion (DRG) neurons was determined. We also performed patch clamp analysis on cultivated DRG neurons and human embryonic kidney 293 (HEK) cells expressing voltage-gated-sodium channel 1.7 (Nav1.7) as an in vitro model of FD. Intracellular Gb3 deposits were modulated using shRNA silencing of α-galactosidase A.
After intraplantar injection of complete Freund`s adjuvant (CFA) and chronic constriction injury (CCI) of the right sciatic nerve, old GLA KO mice did not develop heat and mechanical hypersensitivity in contrast to young GLA KO and old WT mice. Additionally, we found no relevant differences between genotypes and age-groups in affective and cognitive behavior in the naïve state and after CFA injection. Gene and protein expression analysis provided no explanation for the observed sensory impairment. However, cultured DRG neurons of old GLA KO mice revealed a marked decrease of sodium and Ih-currents compared to young GLA KO and old WT mice. DRG neurons of old GLA KO mice displayed substantial intracellular accumulation of Gb3 compared to young GLA KO and old WT mice. Similar to cultured neurons, sodium currents were also decreased in HEK cells treated with shRNA and consecutively increased intracellular Gb3 deposits compared to the control condition, but could be rescued by treatment with agalsidase-alpha.
Our study unveils that, similar to patients with FD, GLA KO mice display age-dependent sensory deficits. However, contrary to patients, GLA KO mice are also protected from hypersensitivity induced by inflammation and nerve lesion due to Gb3-dependent and reversible reduction of neuronal sodium- and Ih-currents. Our data provide evidence for direct Gb3-dependent ion channel impairment in sensory DRG neurons as a potential contributor to sensory dysfunction and pain in FD.
The pancreas and the small intestine are pivotal organs acting in close synergism to regulate glucose metabolism. After absorption and processing of dietary glucose within the small intestine, insulin and glucagon are released from pancreatic islet cells to maintain blood glucose homeostasis. Malfunctions affecting either individual, organ-specific functions or the sophisticated interplay of both organs can result in massive complications and pathologic conditions. One of the most serious metabolic diseases of our society is diabetes mellitus (DM) that is hallmarked by a disturbance of blood glucose homeostasis. Type 1 (T1DM) and type 2 (T2DM) are the main forms of the disease and both are characterized by chronic hyperglycemia, a condition that evokes severe comorbidities in the long-term. In the past, several standard treatment options allowed a more or less adequate therapy for diabetic patients. Albeit there is much effort to develop new therapeutic interventions to treat diabetic patients in a more efficient way, no cure is available so far. In view of the urgent need for alternative treatment options, a more systemic look on whole organ systems, their biological relation and complex interplay is needed when developing new therapeutic strategies for DM.
T1DM is hallmarked by an autoimmune-mediated destruction of the pancreatic β-cell mass resulting in a complete lack of insulin that is in most patients restored by applying a life-long recombinant insulin therapy. Therefore, novel regenerative medicine-based concepts focus on the derivation of bioartificial β-like cells from diverse stem cell sources in vitro that survive and sustain to secrete insulin after implantation in vivo. In this context, the first part of this thesis analyzed multipotent intestinal stem cells (ISCs) as alternative cell source to derive bioartificial, pancreatic β-like cells in vitro. From a translational perspective, intestinal stem cells pose a particularly attractive cell source since intestinal donor tissues could be obtained via minimal invasive endoscopy in an autologous way. Furthermore, intestinal and pancreatic cells both derive from the same developmental origin, the endodermal gut tube, favoring the differentiation process towards functional β-like cells. In this study, pancreas-specific differentiation of ISCs was induced by the ectopic expression of the pancreatic transcription factor 1 alpha (Ptf1a), a pioneer transcriptional regulator of pancreatic fate. Furthermore, pancreatic lineage-specific culture media were applied to support the differentiation process. In general, ISCs grow in vitro in a 3D Matrigel®-based environment. Therefore, a 2D culture platform for ISCs was established to allow delivery and ectopic expression of Ptf1a with high efficiency. Next, several molecular tools were applied and compared with each other to identify the most suitable technology for Ptf1a delivery and expression within ISCs as well as their survival under the new established 2D conditions. Success of differentiation was investigated by monitoring changes in cellular morphology and induction of pancreatic differentiation-specific gene expression profiles. In summary, the data of this project part suggest that Ptf1a harbors the potential to induce pancreatic differentiation of ISCs when applying an adequate differentiation media. However, gene expression analysis indicated rather an acinar lineage-determination than a pancreatic β-cell-like specification. Nevertheless, this study proved ISCs not only as interesting stem cell source for the generation of pancreatic cell types with a potential use in the treatment of T1DM but alsoPtf1a as pioneer factor for pancreatic differentiation of ISCs in general.
Compared to T1DM, T2DM patients suffer from hyperglycemia due to insulin resistance. In T2DM management, the maintenance of blood glucose homeostasis has highest priority and can be achieved by drugs affecting the stabilization of blood glucose levels. Recent therapeutic concepts are aiming at the inhibition of the intestinal glucose transporter Na+-D-Glucose cotransporter 1 (SGLT1). Pharmacological inhibition of SGLT1 results in reduced postprandial blood glucose levels combined with a sustained and increased Glucagon-like peptide 1 (GLP-1) secretion. So far, systemic side effects of this medication have not been addressed in detail. Of note, besides intestinal localization, SGLT1 is also expressed in various other tissues including the pancreas. In context of having a closer look also on the interplay of organs when developing new therapeutic approaches for DM, the second part of this thesis addressed the effects on pancreatic islet integrity after loss of SGLT1. The analyses comprised the investigation of pancreatic islet size, cytomorphology and function by the use of a global SGLT1 knockout (SGLT1-/-) mouse model. As SGLT1-/- mice develop the glucose-galactose malabsorption syndrome when fed a standard laboratory chow, these animals derived a glucose-deficient, fat-enriched (GDFE) diet. Wildtype mice on either standard chow (WTSC) or GDFE (WTDC) allowed the discrimination between diet- and knockout-dependent effects. Notably, GDFE fed mice showed decreased expression and function of intestinal SGLT1, while pancreatic SGLT1 mRNA levels were unaffected. Further, the findings revealed increased isled sizes, reduced proliferation- and apoptosis rates as well as an increased α-cell and reduced β-cell proportion accompanied by a disturbed cytomorphology in islets when SGLT1 function is lost or impaired. In addition, pancreatic islets were dysfunctional in terms of insulin- and glucagon-secretion. Moreover, the release of intestinal GLP-1, an incretin hormone that stimulates insulin-secretion in the islet, was abnormal after glucose stimulatory conditions. In summary, these data show that intestinal SGLT1 expression and function is nutrient dependent. The data obtained from the islet studies revealed an additional and new role of SGLT1 for maintaining pancreatic islet integrity in the context of structural, cytomorphological and functional aspects. With special emphasis on SGLT1 inhibition in diabetic patients, the data of this project indicate an urgent need for analyzing systemic side effects in other relevant organs to prove pharmacological SGLT1 inhibition as beneficial and safe.
Altogether, the findings of both project parts of this thesis demonstrate that focusing on the molecular and cellular relationship and interplay of the small intestine and the pancreas could be of high importance in context of developing new therapeutic strategies for future applications in DM patients.
Humans are continuously exposed to airborne spores of the saprophytic fungus Aspergillus fumigatus. However, in healthy individuals pulmonary host defense mechanisms efficiently eliminate the fungus. In contrast, A. fumigatus causes devastating infections in immunocompromised patients. Host immune responses against A. fumigatus lung infections in immunocompromised conditions have remained largely elusive. Given the dynamic changes in immune cell subsets within tissues upon immunosuppressive therapy, we dissected the spatiotemporal pulmonary immune response after A. fumigatus infection to reveal basic immunological events that fail to effectively control invasive fungal disease. In different immunocompromised murine models, myeloid, notably neutrophils, and macrophages, but not lymphoid cells were strongly recruited to the lungs upon infection. Other myeloid cells, particularly dendritic cells and monocytes, were only recruited to lungs of corticosteroid treated mice, which developed a strong pulmonary inflammation after infection. Lymphoid cells, particularly CD4\(^+\) or CD8\(^+\) T-cells and NK cells were highly reduced upon immunosuppression and not recruited after A. fumigatus infection. Moreover, adoptive CD11b\(^+\) myeloid cell transfer rescued cyclophosphamide immunosuppressed mice from lethal A. fumigatus infection but not cortisone and cyclophosphamide immunosuppressed mice. Our findings illustrate that CD11b\(^+\) myeloid cells are critical for anti-A. fumigatus defense under cyclophosphamide immunosuppressed conditions.
Myocardial B-cell infiltration after LAD occlusion in mice is driven by CXCL13
After myocardial infarction, the immune system is activated and regulates wound healing and remodeling processes in the heart.
While the role of T cells has been elucidated already, the function of B cells in myocardial infarction remained relatively unclear until now. It is, however, already known that B cells are of importance in healing processes in other tissues, for example in the skin.
Our studies therefore addressed the role and function of B cells in healing and early remodeling processes in the myocardium after infarction.
Under physiological conditions, only few B cells can be found in the heart. After myocardial infarction, however, which we modelled with a permanent ligation of the left anterior descending artery (LAD) in C57BL/6J mice, we could demonstrate that B lymphocytes accumulate in the early phase after tissue injury (days one to seven) in the myocardium.
To detect B cells, we performed immunofluorescence stainings on cryosections of infarcted hearts using an anti-B220 antibody. Quantitative analysis of tissue infiltration revealed that B cells peaked at day seven. In flow cytometry, we further characterized the B cells infiltrating infarcted tissue. We found that most of them were mature B cells (IgM+, IgD+).
Next, we wanted to outline a potential mechanism responsible for B-cell infiltration to the site of tissue injury. We therefore performed ELISA experiments revealing that CXCL13 was upregulated in scar tissue.
Antibody-mediated neutralization of CXCL13 verifiably attenuated B-cell infiltration.
Treated mice also showed – in the tendency – smaller infarct sizes and an improved survival.
In conclusion, we could show that B lymphocytes infiltrate the myocardium after MI in mice following a local CXCL13 gradient and that it is, most likely, beneficial to inhibit this process.
Bei der Entstehung und Aufrechterhaltung von Furcht und Angsterkrankungen stellt, neben der Furchtkonditionierung, die Generalisierung der konditionierten Furcht einen wesentlichen Mechanismus dar. Die der Generalisierung zugrunde liegenden psychologischen und biologischen Prozesse sind jedoch beim Menschen bisher nur wenig untersucht.
Ziel dieser Arbeit war, anhand eines neu entwickelten experimentellen Paradigmas den Einfluss eines psychometrisch bestimmbaren angstspezifischen Faktors sowie der mit Furcht und Angst assoziierten Genotypen Stathmin1, COMT Val158Met und BDNF Val66Met auf die Furchtkonditionierung und Generalisierung konditionierter Furcht zu untersuchen und somit mögliche Risikofaktoren für die Entstehung von Angsterkrankungen zu bestimmen. Hierfür wurden N = 126 gesunde Versuchspersonen (n = 69 weiblich; mittleres Alter M = 23.05, SD = 3.82) für die genannten Polymorphismen genotypisiert und zu ängstlichen und affektiven Symptomen befragt. In einer Akquisitionsphase wurden den Probanden zwei neutrale weibliche Gesichter präsentiert (CS), von denen eines mit einem Schrei sowie einem ängstlichen Gesichtsausdruck (UCS) gepaart wurde. Der sich anschließende Generalisierungstest erfolgte anhand von vier Gesichtern, die in der Ähnlichkeit zwischen den beiden CS schrittweise übergingen. Die Furchtreaktion wurde über die Bewertung von Valenz, Arousal und Kontingenzerwartung sowie über die Hautleitfähigkeitsreaktion (SCR) erfasst.
Die Analyse der Fragebögen anhand einer Hauptachsenanalyse und anhand von Strukturgleichungsmodellen erbrachte eine zweifaktorielle Lösung, die die Konstrukte Depression und Angst abbildete. Nur der Faktor Angst war mit einer veränderten Furchtkonditionierung und Furchtgeneralisierung assoziiert: Hoch Ängstliche zeigten eine stärkere konditionierte Furchtreaktion (Arousal) und wiesen eine stärkere Generalisierung der Valenzeinschätzung und Kontingenzerwartung auf. Für den Stathmin1 Genotyp ergaben sich geschlechtsspezifische Effekte. Bei den männlichen Versuchspersonen zeigte sich in Folge der Akquisition ein stärkerer Abfall der Valenz für den CS+ in der Gruppe der Stathmin1 T Allelträger, die ebenfalls eine stärkere Generalisierung der Furchtreaktion, abgebildet in allen verbalen Maßen, aufwiesen. Ein gegenteiliger Befund ergab sich für die Gruppe der Frauen, insofern eine mit dem Stathmin1 C Allel assoziierte höhere Generalisierung der Valenz, des Arousals und der Kontingenzerwartung festgestellt werden konnte. Für den COMT Val158Met Genotyp ergaben sich keine Einflüsse auf die Akquisition der konditionierten Furcht. Für Träger des COMT 158Val Allels zeigte sich jedoch eine stärkere Generalisierung der Valenz und der Kontingenzerwartung. Auch für den BDNF Val66Met Genotyp konnte keine Veränderung der Furchtakquisition beobachtet werden. Es ergaben sich jedoch Hinweise auf eine erhöhte Generalisierung der Kontingenzerwartung in der Gruppe der BDNF 66Val Homozygoten. Für keinen der beschriebenen Faktoren konnte ein Einfluss auf die Furchtkonditionierung oder deren Generalisierung anhand der SCR abgebildet werden.
Unsere Ergebnisse weisen auf einen psychometrisch erfassbaren Faktor und genetische Einflüsse hin, die über den Prozess einer stärkeren Generalisierung der konditionierten Furcht das Risiko für die Entstehung von Angsterkrankungen erhöhen können. Jedoch sollten die Befunde in größeren Stichproben repliziert werden. Neben der frühzeitigen Identifikation von Risikofaktoren sollten in zukünftigen Studien darüber hinaus wirksame Maßnahmen zur Prävention und Intervention entwickelt werden, um diesem Risiko entgegen zu wirken.
The brain is the central organ of an animal controlling its behavior. It integrates internal information from the body and external stimuli from the surrounding environment to mediate an appropriate behavioral response. Since the environment is constantly changing, a flexible adjustment of the brain to new conditions is crucial for the animals’ fitness. The ability of the nervous system to adapt to new challenges is defined as plasticity. Over the last few decades great advances have been made in understanding the cellular and molecular mechanisms underlying neuronal plasticity. Plasticity may refer to structural changes physically remodeling the neuronal circuit, or to functional adaptations which are manifested in modified synaptic transmission, and in altered response and firing properties of single neurons. These structural and functional modifications are mediated by a complex interplay of environmental stimuli, intracellular signal transduction cascades, protein modifications, gene translation and transcription, and epigenetic gene regulatory mechanisms. However, especially the molecular mechanisms of environmentally-induced structural neuronal plasticity are still poorly understood.
In this thesis the honey bee was used as an innovative model organism to investigate this issue. The honey bee with its rich behavioral repertoire, highly sophisticated and plastic neuronal system, sequenced genome and full epigenetic machinery is well suited for studying the molecular underpinnings of environmentally-induced neuronal plasticity. Adult honey bees progress through a series of tasks within the dark hive until after about three weeks they start with foraging activities in the external world. The transition from in-hive to outside tasks is associated with remarkable structural neuronal plasticity. Subdivisions of the mushroom body, a brain region related to higher cognitive functions, are increased in volume. The volume expansion is mediated by a remarkable outgrowth of the dendritic network of mushroom body intrinsic neurons, so called Kenyon cells. In parallel, prominent synaptic structures, referred to as microglomeruli, are pruned. Most interestingly for this thesis, the pruning of microglomeruli and the dendritic expansion in Kenyon cells can be induced by a simple light exposure paradigm.
In the first chapter of the present thesis I used this paradigm to induce synaptic plasticity in the mushroom bodies under controlled lab conditions to search for correlating molecular changes which possibly mediate the observed plasticity. I compared the brain transcriptome of light-exposed and dark-kept control bees by whole transcriptome sequencing. This revealed a list of differentially expressed genes (DEGs). The list contains conserved genes which have reported functions in neuronal plasticity, thereby introducing them as candidate genes for plasticity in the honey bee brain. Furthermore, with this transcriptomic approach I discovered many candidate genes with unknown functions or functions so far unrelated to neuronal plasticity suggesting that these novel genes may have yet unrecognized roles in neuronal plasticity. A number of DEGs are known to be methylated or to exert epigenetic modifications on themselves speaking for a strong impact of epigenetic mechanisms in light-induced structural plasticity in the honey bee brain. This notion is supported by a differential methylation pattern of one examined DEG between light-exposed and dark-kept bees as shown in this thesis. Also a plasticity-related microRNA, which is predicted to target genes associated with cytoskeleton formation, was found to be upregulated in light-exposed bees. This speaks for a translation regulatory mechanism in structural plasticity in the honey bee.
Another interesting outcome of this study is the age-dependent expression of DEGs. For some plasticity-related DEGs, the amplitude of light-induced expression differs between one- and seven-day-old bees, and also the basal expression level of many DEGs in naive dark-kept control bees significantly varies between the two age groups. This suggests that the responsiveness of plasticity-related genes to environmental stimuli is also under developmental (age-dependent) control, which may be important for normal maturation and for the regulation of age-related changes in behavior. Indeed, I was able to demonstrate in phototaxis experiments that one- and seven-day-old bees show different behaviors in response to light exposure and thus the correlating age-dependent transcriptional differences may serve as mechanisms promoting age-related changes in behavior.
Together the results of the transcriptomic study demonstrate the successfulness of my approach to identify candidate molecular mechanisms for environmentally-induced structural plasticity in the honey bee brain. Furthermore, the thesis provides seminal evidence for the implication of DNA methylation in this process.
To better understand the role of DNA methylation for neuronal and behavioral plasticity in the honey bee, the second chapter of the thesis aims at characterizing this molecular process under more natural conditions. Therefore, I examined the expression of the DNA methyltransferase 3 (DNMT3) and of Ten-eleven translocation methylcytosine dioxygenase (TET) between in-hive bees and foragers. DNMT3 is responsible for DNA de novo methylation, whereas TET promotes DNA demethylation by converting methylcytosine (5mC) to hydroxymethylcytosine (5hmC). The data suggest that age and experience determine the expression of these two epigenetic key genes. Additionally, in this context, two examined DEGs are shown to be differentially methylated between nurses and foragers. One of these two DEGs, the plasticity related gene bubblegum (bgm), also exhibits an altered DNA methylation pattern in response to light exposure. Hence, these results of my thesis provide additional evidence for the importance of DNA methylation in behavioral and neuronal plasticity.
Results from the second chapter of this thesis also suggest additional functions of DNMT3 and TET to their traditional roles in DNA methylation/demethylation. I show that TET is far more expressed in the honey bee brain than DNMT3. This stands in contrast to the relative scarcity of 5hmC compared to 5mC and points at extra functions of this gene like RNA modifications as reported for Drosophila. Antibody staining against the DNMT3 gene product revealed an unexpected rare localization of the enzyme in the nucleus, but a surprisingly high abundance in the cytoplasm. The role of cytoplasmic DNMT3 is unknown. One possibility for the high abundance in the cytoplasm is a regulatory mechanism for DNA methylation by cytoplasmic-nuclear trafficking, or an additional function of DNMT3 in RNA modification, similar to TET.
Altogether, this thesis points at future research directions for neuronal plasticity by providing promising evidence for the involvement of epigenetic mechanisms and of a number of new candidate genes in environmentally induced structural plasticity in the honey bee brain. Furthermore, I present data suggesting so far unrecognized functions of DNMT3 which certainly need to be experimentally addressed in the future to fully understand the role of this enzyme.
The plant cuticle is a continuous extracellular protective layer covering the outermost surfaces of higher plants that are in contact with the surrounding atmosphere. The primary function of the cuticular lipid membrane, which is mainly composed of biopolymer cutin and cuticular waxes, is to protect the plant organs against uncontrolled water loss. The chemical composition and the biophysical properties of cuticular waxes affect the rate of water diffusion across the cuticle. Fruit transpiration plays an important role in the development and the maintenance of fruit quality. The fruit has been suggested to present better dehydration stress tolerance than the leaf. However, the differences in transpiration and the chemical composition of cuticular waxes between fruit and leaf have yet to be comprehensively investigated.
The present study aims to investigate the water permeability and cuticular wax composition of fruit and leaf cuticles of a wide range of plant species and to elucidate the different roles of the cuticular wax components in the transpiration barrier. To address these objectives, fruit and leaf samples from 17 species were investigated. The cuticular transpiration of intact fruits and astomatous adaxial leaf surfaces and the minimum leaf conductance obtained by leaf drying curves for intact leaves were gravimetrically determined for a variety of plant species. The chemical composition of cuticular waxes of fruits and leaves was thoroughly analysed by gas chromatography with flame ionization and mass spectrometry.
The water permeability of fruits ranged from 3.7 x 10-5 m s-1 (Prunus domestica subsp. syriaca) to 37.4 x 10-5 m s-1 (Coffea arabica), whereas permeability for leaves varied between 1.6 x 10-5 m s-1 (Cornus officinalis) and 4.5 x 10-5 m s-1 (Prunus domestica subsp. syriaca (L.)). The interspecies range of water permeability of fruits was significantly higher than that of leaves. Chemical analyses of the cuticular waxes demonstrated that fatty acids, primary alcohols, n-alkanes, aldehydes and alkyl esters were the predominant very-long-chain aliphatic compound classes of fruit and leaf surfaces. Sterols, such as β-sitosterol and campesterol, and triterpenoids, such as oleanolic acid, ursolic acid, α-amyrin and ß-amyrin, were the major cyclic compound classes in the cuticular wax membrane.
The amount and composition of cuticular waxes of both fruits and leaves varied at an intraspecific level. There were no significant correlations between the total cuticular wax load or the individual cuticular wax composition and the water permeability of fruits or leaves independently or together. After combining the fruit and leaf data set, a significant correlation between the average chain length of very-long-chain aliphatic compounds and permeabilities was detected, i.e. the longer the average chain length, the lower the water permeability.
Interestingly, n-Nonacosane (C29) was abundantly detected in fruit waxes of Rosaceae species. These fruits exhibited a relatively low transpiration level, which was very close to their leaf cuticular permeability. The present study suggests that the lower cuticular permeability of leaves, in comparison to that of fruits, may be attributed to the longer average chain length of aliphatic compounds. The accumulation of total wax, triterpenoids and aliphatic compounds may not contribute to the transpiration barrier directly. The present results are highly consistent with the previous model assumptions for the cuticular structure and transport barrier. Furthermore, this comparative study on leaf and fruit cuticles provides further insights linking the cuticular wax chemistry to the physiological properties of the plant cuticle.
Platelet activation and aggregation at sites of vascular injury is critical to prevent excessive blood loss, but may also lead to life-threatening ischemic diseases, such as myocardial infarction and stroke. Extracellular agonists induce platelet activation by stimulation of platelet membrane receptors. Signal transduction results in reorganization of the cytoskeleton, shape change, platelet adhesion and aggregation, cumulating in thrombus formation. Several Rho GTPases, including Rac1, Cdc42 and RhoA, are essential mediators of subsequent intracellular transduction of ITAM- and GPCR-signaling. Therefore, inhibition or knockout can result in severely defective platelet signaling.
Mice with platelet specific Rac1-deficiency are protected from arterial thrombosis. This benefit highlights further investigation of Rac1-specific functions and its potential as a new pharmacological target for prevention of cardiovascular diseases. Two newly developed synthetic compounds, NSC23766 and EHT1864, were proposed to provide highly specific inhibition of Rac1 activity, but both drugs have never been tested in Rac1-deficient cell systems to rule out potential Rac1-independent effects.
This study revealed significant off-target effects of NSC23766 and EHT1864 that occurred in a dose-dependent fashion in both wild-type and Rac1-deficient platelets. Both inhibitors individually affected resting platelets after treatment, either by altering membrane protein expression (NSC23766) or by a marked decrease of platelet viability (EHT1864). Platelet apoptosis could be confirmed by enhanced levels of phosphatidylserine exposure and decreased mitochondrial membrane potential. Phosphorylation studies of the major effector proteins of Rac1 revealed that NSC23766 and EHT1864 abolish PAK1/PAK2 activation independently of Rac1 in wild-type and knockout platelets, which may contribute to the observed off-target effects.
Additionally, this study demonstrated the involvement of Rac1 in G protein-coupled receptor-mediated platelet activation and GPIb-induced signaling. Furthermore, the data revealed that Rac1 is dispensable in the process of integrin IIb 3-mediated clot retraction.
This study unveiled that new pharmacological approaches in antithrombotic therapy with Rac1 as molecular target have to be designed carefully in order to obtain high specificity and minimize potential off-target effects.
Der Tumorsupressor APC ist in der Mehrzahl aller Fälle kolorektaler Karzinome bereits in
der initialen Phase der Karzinogenese mutiert. Diese Mutationen führen zu einer aberranten Aktivierung des Wnt-Signalweges sowie zu weiteren die Karzinogenese vorrantreibenden Aktivitäten, beispielsweise einem veränderten Migrationsverhalten. Dieser Dissertation
zu Grunde liegt die Idee, dass durch die Trunkierung des APC-Proteins aber auch Abhängigkeiten von Genaktivitäten entstehen, die zuvor entbehrlich waren. Solche synthetisch
letalen Gene sollten in einem high-content shRNA-Screen gefunden werden.
Für die Durchführung des Screens wurde ein von der SW480 Kolonkarzinomzelllinie
abgeleitetes, isogenes Zellsystem generiert, welches durch Induktion mit Doxyzyklin das
vollständige APC-Allel (FL-APC) exprimiert. Infolge dieser Expression zeigen die Zellen
einen weniger malignen Phänotyp. Dies spiegelt sich darin wider, dass die Zellen durch
FL-APC Expression in ihrer Wnt-Signalwegsaktivität eingeschränkt werden. Doxyzyklininduzierte Zellen sind schlechter in der Lage ohne Adhäsion zu proliferieren als nicht induzierte Zellen. Andererseits ist ihre Fähigkeit einem FKS-gradienten entlang zu migrieren
verbessert.
Der shRNA-Screen wurde mit der Decipher shRNA-Bibliothek durchgeführt. Diese
enthält 27.500 verschiedene shRNAs mit Interferenzaktivität gegen 5.000 mRNAs, die potentiell pharmakologisch inhibierbare Proteine kodieren. Die besten zwei Kandidaten für
eine synthetisch letale Interaktion mit trunkiertem APC, BCL2L1 und EIF2B5 wurden im
Verlauf einer Masterarbeit bzw. direkt in dieser Disseration validiert. EIF2B5 zeigte in vitro nach Depletion durch unterschiedliche shRNAs einen di erentiellen Proliferationse ekt
bei FL-APC induzierten im Vergleich zu kontrollbehandelten Zellen. Dieser di erentielle
E ekt konnte in einem weiteren Modellsystem, SW480 Zellen mit konstitutiver FL-APC
Expression, ebenfalls validiert werden.
Durch Expression einer shRNA mit Aktivität gegen EIF2B5 werden in beiden Zellsystem die unfolded protein response (UPR) Gene DDIT3 und splXBP1 aktiviert. Interessanterweise werden durch die Expression von FL-APC diese Gene reprimiert. Im Promotor
der EIF2B5-mRNA be ndet sich eine Bindestelle für MYC. Es ist denkbar, dass durch die
Expression von FL-APC eine globale Veränderung der Genexpression vorgenommen wird,
die einerseits eine Repression von EIF2B5 nach sich zieht aber andererseits eine hierdurch
ausgelöste ER-Stress Antwort verhindert. Eine Inhibition von EIF2B5 ohne diese Adaption
andererseits führt nach diesem Model zu einer UPR-aktivierten Apoptose.
In einem zweiten Projekt wurde das überraschende Verhalten von Kolonkarzinomzellen untersucht, die nach Zugabe von BEZ235, einem dualen PI3K/mTOR Inhibitor, trotz
gegenteiliger Erwartungen MYC-Proteinmengen erhöhen. Eine Repression wurde erwar-
tet, weil die Inhibition von PI3K einerseits zu einer proteasomalen Destabiliserung und
andererseits die mTOR Inhibition zu einer verringerten Synthese von MYC führen sollte.
Während bereits gezeigt werden konnte, dass durch einen FOXO-vermittelten Mechanismus MAPK-abhängig die MYC-Expression verstärkt wird, wurde in dieser Dissertation
die erwartete Translationsinhibition untersucht. BEZ235 inhibiert zwar CAP-abhängige
Translation, das MYC Protein wird jedoch aufgrund einer IRES-vermittelten Translation
weiterhin exprimiert. Silvestrol, ein Inhibitor der Helikase eIF4A andererseits interveniert
mit CAP- und IRES-abhängiger Translation und kann die MYC-Proteinkonzentrationen
verringern. Wir konnten zudem feststellen, dass die Applikation von Silvestrol auch in vivo
möglich und wirksam ist und zudem tolleriert wird. Dies gibt Anlass zur Ho nung, dass
eine Intervention der Translation auch im Menschen eine valide Strategie zur Behandlung
MYC-getriebener Tumore sein könnte.
Die Synthese der mRNA durch die RNA-Polymerase II ist der zentrale und kritische Prozess im Rahmen
der Transkriptionsregulation Protein-kodierender Gene. Viele Jahrzehnte der intensiven Erforschung brachten viele Details über diesen Mechanismus zu Tage, der von einer unglaublichen Komplexität und Dynamik geprägt ist. Dabei stellte sich heraus, dass der Mediatorkomplex eine zentrale Rolle bei der Regulation der Polymerase II-abhängigen Transkription spielt, im Besonderen der Initiation. In der Funktion einer Schnittstelle verknüpft er die allgemeine Transkriptionsmaschinerie mit den Gen- spezifischen Transkriptionsregulatoren. Durch die Interaktion des Schwanzmoduls mit diesen Regulatoren und der Interaktion des Kopfmoduls mit der Polymerase II verbindet er wie eine Brücke die oberhalb des Promotors liegenden Aktivatorsequenzen mit dem Kernpromotor und initiiert so die Ausbildung des Pre-Initiationskomplexes. Darüber hinaus mehren sich gerade in den letzten Jahren die Hinweise darauf, dass der Mediator auch noch an anderen Prozessen der Transkription beteiligt ist. Zu diesen gehören z.B. die Elongation, die Ausbildung von Genschlaufen oder auch der Umbau der Chromatinstruktur. In Anbetracht der Tatsachen, dass der Mediator (a) aus bis zu 25 Untereinheiten mit flexibler Zusammensetzung besteht, (b) eine flexible Struktur besitzt und (c) umfassend und dynamisch über posttranslationale Modifikationen modifiziert ist, erscheint es durchaus möglich, dass der Mediator all diese Funktionen ausfüllt und die Rolle einer allgemeinen Transkriptionsplattform einnimmt. Im Zusammenhang mit dieser Dissertationsschrift ist es gelungen, den Mediator innerhalb all dieser Funktionen „abzubilden“ und die bisher umfassendste Interaktomanalyse dieses Komplexes zu präsentieren. Durch die optimierten Bedingungen der Zelllyse und Co-Immunopräzipitation, gelang es auch transiente Interaktionspartner zu isolieren. Durch das metabolische Markieren der Wildtypkontrolle konnten außerdem unspezifische und spezifische Interaktionen eindeutig voneinander unterschieden werden. Über 400 Proteine wurden als signifikante Interaktionspartner des Mediators identifiziert. Viele dieser Proteine konnten als vollständige Komplexe zusammengefasst werden, z.B die RNA-Polymerase II, alle allgemeinen Transkriptionsfaktoren, der SAGA-Komplex, viele Komplexe des Chromatin Remodelings und stark acetylierte Histone. Viele weitere Interaktionspartner spielen zudem eine Rolle bei der co-transkriptionalen Prozessierung der mRNA, wie z.B dem Splicing, dem mRNA-decapping oder Abbau. Darüber hinaus gibt es starke Hinweise darauf, dass der Mediator auch mit der Polymerase I und III interagiert und an der ribosomalen Biogenese beteiligt ist. Weitere
Analysen zeigten, dass das Interaktom zudem hochdynamisch ist
The present work investigates the influence of environmental stimuli on the building behavior of workers of the leaf-cutting ant Atta vollenweideri. It focuses on cues related to the airflow-driven ventilation of their giant underground nests, i.e., air movements and their direction, carbon dioxide concentrations and humidity levels of the nest air. First, it is shown that workers are able to use airflow and its direction as learned orientation cue by performing learning experiments with individual foragers using a classical conditioning paradigm. This ability is expected to allow workers to also navigate inside the nest tunnels using the prevailing airflow directions for orientation, for example during tasks related to nest construction and climate control.
Furthermore, the influence of carbon dioxide on the digging behavior of workers is investigated. While elevated CO2 levels hardly affect the digging rate of the ants, workers prefer to excavate at locations with lower concentrations and avoid higher CO2 levels when given a choice. Under natural conditions, shifting their digging activity to soil layers containing lower carbon dioxide levels might help colonies to excavate new or to broaden existing nest openings, if the CO2 concentration in the underground rises.
It is also shown that workers preferably transport excavated soil along tunnels containing high CO2 concentrations, when carbon dioxide levels in the underground are elevated as well. In addition, workers prefer to carry soil pellets along outflow tunnels instead of inflow tunnels, at least for high humidity levels of the air. The material transported along tunnels providing outflow of CO2-rich air might be used by workers for the construction of ventilation turrets on top of the nest mound, which is expected to promote the wind-induced ventilation and the removal of carbon dioxide from the underground.
The climatic conditions inside the nest tunnels also influence the structural features of the turrets constructed by workers on top the nest. While airflow and humidity have no effect on turret structure, outflow of CO2-rich air from the nest causes workers to construct turrets with additional openings and increased aperture, potentially enhancing the airflow-driven gas exchanges within the nest.
Finally, the effect of airflow and ventilation turrets on the gas exchanges in Atta vollenweideri nests is tested experimentally on a physical model of a small nest consisting of a single chamber and two nest tunnels. The carbon dioxide clearance rate from the underground was measured depending on both the presence of airflow in the nest and the structural features of the built turrets. Carbon dioxide is removed faster from the physical nest model when air moves through the nest, confirming the contribution of wind-induced flow inside the nest tunnels to the ventilation of Atta vollenweideri nests. In addition, turrets placed on top of one of the tunnel openings of the nest further enhance the CO2 clearance rate and the effect is positively correlated with turret aperture.
Taken together, climatic variables like airflow, carbon dioxide and humidity levels strongly affect the building responses of Atta vollenweideri leaf-cutting ants. Workers use these environmental stimuli as orientation cue in the nest during tasks related to excavation, soil transport and turret construction. Although the effects of these building responses on the microclimatic conditions inside the nest remain elusive so far, the described behaviors are expected to allow ant colonies to restore and maintain a proper nest climate in the underground.
RNA sequencing (RNA-seq) has in recent years become the preferred method for gene expression analysis and whole transcriptome annotation. While initial RNA-seq experiments focused on eukaryotic messenger RNAs (mRNAs), which can be purified from the cellular ribonucleic acid (RNA) pool with relative ease, more advanced protocols had to be developed for sequencing of microbial transcriptomes. The resulting RNA-seq data revealed an unexpected complexity of bacterial transcriptomes and the requirement for specific analysis methods, which in many cases is not covered by tools developed for processing of eukaryotic data.
The aim of this thesis was the development and application of specific data analysis methods for different RNA-seq-based approaches used to gain insights into transcription and gene regulatory processes in prokaryotes.
The differential RNA sequencing (dRNA-seq) approach allows for transcriptional start site (TSS) annotation by differentiating between primary transcripts with a 5’-triphosphate (5’-PPP) and processed transcripts with a 5’-monophosphate (5’-P). This method was applied in combination with an automated TSS annotation tool to generate global trancriptome maps for Escherichia coli (E. coli) and Helicobacter pylori (H. pylori).
In the E. coli study we conducted different downstream analyses to gain a deeper understanding of the nature and properties of transcripts in our TSS map. Here, we focused especially on putative antisense RNAs (asRNAs), an RNA class transcribed from the opposite strand of known protein-coding genes with the potential to regulate corresponding sense transcripts. Besides providing a set of putative asRNAs and experimental validation of candidates via Northern analysis, we analyzed and discussed different sources of variation in RNA-seq data.
The aim of the H. pylori study was to provide a detailed description of the dRNA-seq approach and its application to a bacterial model organism. It includes information on experimental protocols and requirements for data analysis to generate a genome-wide TSS map. We show how the included TSS can be used to identify and analyze transcriptome and regulatory features and discuss challenges in terms oflibrary preparation protocols, sequencing platforms, and data analysis including manual and automated TSS annotation.
The TSS maps and associated transcriptome data from both H. pylori and E. coli were made available for visualization in an easily accessible online browser.
Furthermore, a modified version of dRNA-seq was used to identify transcriptome targets of the RNA pyrophosphohydrolase (RppH) in H. pylori. RppH initiates 5’-end-dependent degradation of transcripts by converting the 5’-PPP of primary transcripts to a 5’-P. I developed an analysis method, which uses data from complementary DNA (cDNA) libraries specific for transcripts carrying a 5’-PPP, 5’-P or both, to specifically identify transcripts modified by RppH. For this, the method assessed the 5’-phosphorylation state and cellular concentration of transcripts in rppH deletion in comparison to strains with the intact gene. Several of the identified potential RppH targets were further validated via half-life measurements and quantification of their 5’-phosphorylation state in wild-type and mutant cells. Our findings suggest an important role for RppH in post-transcriptional gene regulationin H. pylori and related organisms.
In addition, we applied two RNA-seq -based approaches, RNA immunoprecipitation followed by sequencing (RIP-seq) and cross-linking immunoprecipitation followed by sequencing (CLIP-seq), to identify transcripts bound by Hfq and CsrA, two RNA-binding proteins (RBPs) with an important role in post-transcriptional regulation.
For RIP-seq -based identification of CsrA binding regions in Campylobacter jejuni(C. jejuni), we used annotation-based analysis and, in addition, a self-developed peak calling method based on a sliding window approach. Both methods revealed flaA mRNA, encoding the major flagellin, as the main target and functional analysis of identified targets showed a significant enrichment of genes involved in flagella biosynthesis. Further experimental analysis revealed the role of flaA mRNA in post-transcriptional regulation. In comparison to RIP-seq, CLIP-seq allows mapping of RBP binding sites with a higher resolution. To identify these sites an approach called “block-based peak calling” was developed and resulting peaks were used to identify sequence and structural constraints required for interaction of Hfq and CsrA with Salmonella transcripts.
Overall, the different RNA-seq-based approaches described in this thesis together with their associated analyis pipelines extended our knowledge on the transcriptional repertoire and modes of post-transcriptional regulation in bacteria. The global TSS maps, including further characterized asRNA candidates, putative RppH targets, and identified RBP interactomes will likely trigger similar global studies in the same or different organisms or will be used as a resource for closer examination of these features.
Bacterial functional membrane microdomains (FMMs) are membrane platforms that resemble lipid rafts of eukaryotic cells in certain functional and structural aspects. Lipid rafts are nanometer-sized, dynamic clusters of proteins and lipids in eukaryotic cell membranes that serve as signaling hubs and assembling platforms. Yet, studying these structures can often be hampered by the complexity of a eukaryotic cell. Thus, the analogous structures of prokaryotes are an attractive model to study molecular traits of this type of membrane organization.
Similar to eukaryotic lipid rafts, the bacterial FMMs are comprised of polyisoprenoid lipids, scaffold proteins and a distinct set of membrane proteins, involved in signaling or secretion. Investigating bacterial FMMs not only contributes to the understanding of the physiological importance of FMMs in bacteria, but also helps to elucidate general principles of rafts beyond prokaryotes.
In this work, a bacterial model organism was used to investigate effects of synthetic overproduction of the raft scaffolding proteins on bacterial physiology. This overexpression causes an unusual stabilization of the FMM-harbored protease FtsH and therefore the proteolytic targets of FtsH are not correctly regulated. Developmental defects and aberrances in shape are the consequence, which in turn negatively affects cell physiology. These findings may be adapted to better understand lipid raft processes in humans, where flotillin upregulation is detected along with development of neurological diseases.
Moreover, it was aimed at understanding the FMM-proteome of the human pathogen Staphylococcus aureus. An in-depth quantitative mass-spectrometry analysis reveals adaption of the protein cargo during different conditions, while maintaining a distinct set of core FMM proteins. As a case study, the assembly of the type VII secretion system was shown to be dependent on FMM integrity and more specifically on the activity of the FMM-scaffold flotillin. This secretion system is important for the virulence of this pathogen and its secretion efficiency can be targeted by small molecules that inhibit flotillin activity. This opens new venues for non-conventional antimicrobial compounds to treat staphylococcal infections.
Anxiety and depressive disorders result from a complex interplay of genetic and environmental factors and are common mutual comorbidities. On the level of cellular signaling, regulator of G protein signaling 2 (Rgs2) has been implicated in human and rodent anxiety as well as rodent depression. Rgs2 negatively regulates G protein-coupled receptor (GPCR) signaling by acting as a GTPase accelerating protein towards the Gα subunit.
The present study investigates, whether mice with a homozygous Rgs2 deletion (Rgs2-/-) show behavioral alterations as well as an increased susceptibility to stressful life events related to human anxiety and depressive disorders and tries to elucidate molecular underlying’s of these changes.
To this end, Rgs2-/- mice were characterized in an aversive-associative learning paradigm to evaluate learned fear as a model for the etiology of human anxiety disorders. Spatial learning and reward motivated spatial learning were evaluated to control for learning in non-aversive paradigms. Rgs2 deletion enhanced learning in all three paradigms, rendering increased learning upon deletion of Rgs2 not specific for aversive learning. These data support reports indicating increased long-term potentiation in Rgs2-/- mice and may predict treatment response to conditioning based behavior therapy in patients with polymorphisms associated with reduced RGS2 expression. Previous reports of increased innate anxiety were corroborated in three tests based on the approach-avoidance conflict. Interestingly, Rgs2-/- mice showed novelty-induced hypo-locomotion suggesting neophobia, which may translate to the clinical picture of agoraphobia in humans and reduced RGS2 expression in humans was associated with a higher incidence of panic disorder with agoraphobia. Depression-like behavior was more distinctive in female Rgs2-/- mice. Stress resilience, tested in an acute and a chronic stress paradigm, was also more distinctive in female Rgs2-/- mice, suggesting Rgs2 to contribute to sex specific effects of anxiety disorders and depression.
Rgs2 deletion was associated with GPCR expression changes of the adrenergic, serotonergic, dopaminergic and neuropeptide Y systems in the brain and heart as well as reduced monoaminergic neurotransmitter levels. Furthermore, the expression of two stress-related microRNAs was increased upon Rgs2 deletion. The aversive-associative learning paradigm induced a dynamic Rgs2 expression change. The observed molecular changes may contribute to the anxious and depressed phenotype as well as promote altered stress reactivity, while reflecting an alter basal stress level and a disrupted sympathetic tone. Dynamic Rgs2 expression may mediate changes in GPCR signaling duration during memory formation.
Taken together, Rgs2 deletion promotes increased anxiety-like and depression-like behavior, altered stress reactivity as well as increased cognitive function.
Neurobiology is widely supported by bioinformatics. Due to the big amount of data generated from the biological side a computational approach is required. This thesis presents four different cases of bioinformatic tools applied to the service of Neurobiology.
The first two tools presented belong to the field of image processing. In the first case, we make use of an algorithm based on the wavelet transformation to assess calcium activity events in cultured neurons. We designed an open source tool to assist neurobiology researchers in the analysis of calcium imaging videos. Such analysis is usually done manually which is time consuming and highly subjective. Our tool speeds up the work and offers the possibility of an unbiased detection of the calcium events. Even more important is that our algorithm not only detects the neuron spiking activity but also local spontaneous activity which is normally discarded because it is considered irrelevant. We showed that this activity is determinant in the calcium dynamics in neurons and it is involved in important functions like signal modulation and memory and learning.
The second project is a segmentation task. In our case we are interested in segmenting the neuron nuclei in electron microscopy images of c.elegans. Marking these structures is necessary in order to reconstruct the connectome of the organism. C.elegans is a great study case due to the simplicity of its nervous system (only 502 neurons). This worm, despite its simplicity has taught us a lot about neuronal mechanisms. There is still a lot of information we can extract from the c.elegans, therein lies the importance of reconstructing its connectome. There is a current version of the c.elegans connectome but it was done by hand and on a single subject which leaves a big room for errors. By automatizing the segmentation of the electron microscopy images we guarantee an unbiased approach and we will be able to verify the connectome on several subjects.
For the third project we moved from image processing applications to biological modeling. Because of the high complexity of even small biological systems it is necessary to analyze them with the help of computational tools. The term in silico was coined to refer to such computational models of biological systems. We designed an in silico model of the TNF (Tumor necrosis factor) ligand and its two principal receptors. This biological system is of high relevance because it is involved in the inflammation process. Inflammation is of most importance as protection mechanism but it can also lead to complicated diseases (e.g. cancer). Chronic inflammation processes can be particularly dangerous in the brain. In order to better understand the dynamics that govern the TNF system we created a model using the BioNetGen language. This is a rule based language that allows one to simulate systems where multiple agents are governed by a single rule. Using our model we characterized the TNF system and hypothesized about the relation of the ligand with each of the two receptors. Our hypotheses can be later used to define drug targets in the system or possible treatments for chronic inflammation or lack of the inflammatory response.
The final project deals with the protein folding problem. In our organism proteins are folded all the time, because only in their folded conformation are proteins capable of doing their job (with some very few exceptions). This folding process presents a great challenge for science because it has been shown to be an NP problem. NP means non deterministic Polynomial time problem. This basically means that this kind of problems cannot be efficiently solved. Nevertheless, somehow the body is capable of folding a protein in just milliseconds. This phenomenon puzzles not only biologists but also mathematicians. In mathematics NP problems have been studied for a long time and it is known that given the solution to one NP problem we could solve many of them (i.e. NP-complete problems). If we manage to understand how nature solves the protein folding problem then we might be able to apply this solution to many other problems. Our research intends to contribute to this discussion. Unfortunately, not to explain how nature solves the protein folding problem, but to explain that it does not solve the problem at all. This seems contradictory since I just mentioned that the body folds proteins all the time, but our hypothesis is that the organisms have learned to solve a simplified version of the NP problem. Nature does not solve the protein folding problem in its full complexity. It simply solves a small instance of the problem. An instance which is as simple as a convex optimization problem. We formulate the protein folding problem as an optimization problem to illustrate our claim and present some toy examples to illustrate the formulation. If our hypothesis is true, it means that protein folding is a simple problem. So we just need to understand and model the conditions of the vicinity inside the cell at the moment the folding process occurs. Once we understand this starting conformation and its influence in the folding process we will be able to design treatments for amyloid diseases such as Alzheimer's and Parkinson's.
In summary this thesis project contributes to the neurobiology research field from four different fronts. Two are practical contributions with immediate benefits, such as the calcium imaging video analysis tool and the TNF in silico model. The neuron nuclei segmentation is a contribution for the near future. A step towards the full annotation of the c.elegans connectome and later for the reconstruction of the connectome of other species. And finally, the protein folding project is a first impulse to change the way we conceive the protein folding process in nature. We try to point future research in a novel direction, where the amino code is not the most relevant characteristic of the process but the conditions within the cell.
G-Quadruplex (G4)-Strukturen sind sehr stabile und polymorphe DNA und RNA Sekundärstrukturen mit einem konservierten Guanin-reichen Sequenzmotiv (G4-Motiv). Sie bestehen aus übereinander gestapelten planaren G-Quartetts, in denen je vier Guanine durch Wasserstoffbrückenbindungen zusammengehalten werden.
Da G4-Motive in Eukaryoten an bestimmten Stellen im Genom angereichert vorkommen, wird angenommen, dass die Funktion von G4-Strukturen darin besteht, biologische Prozesse positiv oder negativ zu regulieren. Aufgrund der hohen thermodynamischen Stabilität von G4 Strukturen ist davon auszugehen, dass Proteine in die Faltung, Stabilisierung und Entfaltung dieser Nukleinsäure-Strukturen regulatorisch involviert sind. Bis heute wurden viele Proteine in der Literatur beschrieben, die G4-Strukturen entwinden können. Jedoch konnten bisher nur wenige Proteine identifiziert werden, die in vivo die Faltung fördern oder G4-Strukturen stabilisieren.
Durch Yeast One-Hybrid (Y1H)-Screenings habe ich Zuo1 als neues G4 bindendes Protein identifiziert. In vitro Analysen bestätigten diese Interaktion und es stellte sich heraus, dass Zuo1 G4-Strukturen stabilisiert. Übereinstimmend mit den in vitro Daten konnte gezeigt werden, dass Zuo1 signifikant an G4-Motive im Genom von Saccharomyces ceresivisiae bindet. Genomweit überlappen G4-Motive, an die Zuo1 bindet, mit Stellen, an denen die DNA Replikation zum Stillstand kommt und vermehrt DNA Schäden vorkommen. Diese Ergebnisse legen nahe, dass Zuo1 eine Funktion während der DNA Reparatur oder in Zusammenhang mit dem Vorankommen der DNA Replikationsgabel hat, indem G4-Strukturen stabilisiert werden. Diese Hypothese wird außerdem durch genetische Experimente gestützt, wonach in Abwesenheit von Zuo1 die Genominstabilität zunimmt. Aufgrund dieser Daten war es möglich ein Model zu entwickeln, bei dem Zuo1 während der S-Phase G4-Strukturen bindet und stabilisiert wodurch die DNA Replikation blockiert wird. Diese Interaktion findet neben Stellen schadhafter DNA statt und unterstützt somit DNA Reparatur-Prozesse wie beispielsweise die Nukleotidexzisionsreparatur.
Als weiteres potentielles G4-bindendes Protein wurde Slx9 in Y1H-Screenings identifiziert. In vitro Experimente zeigten zwar, dass Slx9 mit höherer Affinität an G4-Strukturen bindet im Vergleich zu anderen getesteten DNA Konformationen, jedoch wurde in S. cerevisiae genomweit keine signifikante Bindung an G4-Motive festgestellt.