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Institute
- Institut für Pharmazie und Lebensmittelchemie (402) (remove)
Sonstige beteiligte Institutionen
- Universität Belgrad, Serbien (2)
- ACC GmbH Analytical Clinical Concepts (1)
- Apotheke, Universitätsklinikum Würzburg (1)
- Bayer AG, Research & Development, Pharmaceuticals, Investigational Toxicology (1)
- Bundesinstitut für Arzneimittel und Medizinprodukte (1)
- Friedrich-Schiller-Universität Jena (1)
- Helmholtz Institute for RNA-based Infection Biology (HIRI), Josef-Schneider-Straße 2/D15, DE-9708 Wuerzburg, Germany (1)
- Helmholtz Institute for RNA-based Infection Biology (HIRI), Josef-Schneider-Straße 2/D15, DE-97080 Wuerzburg, Germany (1)
- IBMP - Institut für Biomedizinische und Pharmazeutische Forschung in Nürnberg-Heroldsberg (1)
- Johns Hopkins School of Medicine (1)
EU-Project number / Contract (GA) number
- 26230120009 (1)
- 296679 (1)
- 314911 (1)
- 701983 (1)
Polyphenols exert beneficial effects in type 2 diabetes mellitus (T2DM). However, their mechanism of action remains largely unknown. Endothelial Akt-kinase plays a key role in the pathogenesis of cardiovascular complications in T2DM and therefore the modulation of its activity is of interest. This work aimed to characterize effects of structurally different polyphenols on Akt-phosphorylation (pAkt) in endothelial cells (Ea.hy926) and to describe structure-activity features. A comprehensive screening via ELISA quantified the effects of 44 polyphenols (10 µM) on pAkt Ser473. The most pronounced inhibitors were luteolin (44 ± 18%), quercetin (36 ± 8%), urolithin A (35 ± 12%), apigenin, fisetin, and resveratrol; (p < 0.01). The results were confirmed by Western blotting and complemented with corresponding experiments in HUVEC cells. A strong positive and statistically significant correlation between the mean inhibitory effects of the tested polyphenols on both Akt-residues Ser473 and Thr308 (r = 0.9478, p = 0.0003) was determined by immunoblotting. Interestingly, the structural characteristics favoring pAkt inhibition partially differed from structural features enhancing the compounds’ antioxidant activity. The present study is the first to quantitatively compare the influence of polyphenols from nine different structural subclasses on pAkt in endothelial cells. These effects might be advantageous in certain T2DM-complications involving over-activation of the Akt-pathway. The suggested molecular mode of action of polyphenols involving Akt-inhibition contributes to understanding their effects on the cellular level.
The work deals with the synthesis and characterization of cerulenin analogues as inhibitors of efflux pump mediated resistance of Candida albicans isolates and as inhibitors of the fatty acid synthesis enzyme KasA of Mycobacterium tuberculosis. Cerulenin was chosen as the lead structure, being a substrate of the efflux pumps in Candida albicans on one hand and therefore variations on the structure could lead to a blocking of the efflux pumps as in the case of tetracycline and inhibitor 13-CPTC of the TetB efflux pump. On the other hand, cerulenin is a known inhibitor of the FAS system but inhibition is unselective in type I and II FAS. Therefore, analogues could result in increased selectivity towards the type II FAS system in M. tuberculosis. The first cerulenin derivatives were prepared by coupling 2,3-dihydrofuran to the before synthesized 1-octaniodide, followed by ring opening and oxidation in one step by chromic acid and transfer of the resulting 4-keto acid to amides to give analogues 4a-d, 4e was prepared in analogy. To include the epoxide function especially with regard to the mechanism of action of cerulenin in the FAS system (considering known crystal structures of cerulenin and the KasA analogue of E. coli) tetrahydro- and dihydrocerulenin analogues were synthesized. Starting from the corresponding aldehyde, lactone 5 (tetrahydrocerulenin analogues) was obtained via two different routes A and B. Route A included the coupling of the aldehyde 1-nonanal to propiolic acid via a Grignard reaction with subsequent hydrogenation with the Lindlar catalyst under hydrogen pressure to give 5. Via Route B 1-nonanal was coupled to methyl propiolate by n-BuLi with subsequent hydrogenation under reflux with the catalytic system Lindlar cat./NH4HCO2 to yield 5. These hydrogenations were also executed in a microwave oven resulting in better yields and/or reaction times. The lactone 5 was then epoxidized, the ring opened by amidation and the remaining alcohol was oxidized via Collins oxidation to result in tetrahydrocerulenin analogues 8a-e. The same procedure was used for dihydrocerulenin analogues 10a-c except that to obtain the corresponding lactone 9a only route A was used and a further step had to be executed for ring closure. To obtain analogues with all structural features of cerulenin including two double bonds and the epoxide function, a third pathway was chosen. To obtain the future side chain, aldehyde 12 was synthesized by coupling protected 4-pentyn-1-ol to either crotyl bromide or crotyl chloride, which then was deprotected, hydrogenated with Lindlar catalyst under hydrogen pressure and oxidized via a Swern oxidation. The following synthesis sequence starting from 12 was executed similar to that of dihydrocerulenins via the corresponding lactone (51) with the major exception of the oxidation procedure in the last step via TPAP/NMO to result in (4Z,7E)-cerulenin analogues 15a-b. A fourth class of cerulenin analogues was synthesized with the aromatic analogues 17a-e. This synthesis pathway started with the formation of the benzoyl acrylamides 16a-e from benzoylacrylic acid via a mixed anhydride which was prepared with isobutylchloroformate followed by the addition of the corresponding amine. Subsequent epoxidation with H2O2 in basic EtOH gave the aromatic cerulenin analogues 17a-e. Pharmacological testings for the synthesized substances were executed on efflux pump-resistant and -sensitive Candida albicans isolates, on the fatty acid synthesis enzyme KasA of Mycobacterium tuberculosis and on other organisms such as Leishmania major, Trypanosoma brucei brucei, Staphylococcus aureus, Staphylococcus epidermidis, Escherichia coli and Pseudomonas aeruginosa within the Sonderforschungsbereich 630.
Cell culture models are helpful tools to study inflammatory diseases, like rheumatoid arthritis (RA), osteoarthritis (OA), arteriosclerosis or asthma, which are linked to increased matrix metalloproteinase (MMP) activity. Such cell culture models often focus on the secretion of cytokines and growth factors or the direct effects of disease on tissue destruction. Even though the crucial role of MMPs in inflammatory diseases is known, the results of MMP studies are contradictious and the use of MMPs as biomarkers is inconsistent. MMPs play an important role in disease pathology, as they are involved in elastin degradation in the walls of alveoli in chronic obstructive pulmonary disease (COPD), tumor angiogenesis and metastasis and in cartilage and bone degradation in arthropathies. In RA and OA MMPs are secreted by osteocytes, synoviocytes, and by infiltrating immune cells in response to the increased concentration of inflammatory mediators, like growth factors and cytokines. MMPs are zinc and calcium-dependent proteinases and play an important role in physiological and pathological extracellular matrix (ECM) turn over. Their substrate specificity gives them the ability to degrade all major ECM components, like aggrecan, elastin, gelatin, fibronectin and all types of collagen even the triple helix of collagen monomers. The ECM consists of two large three-dimensional cross-linked macromolecule classes: one are fibrous proteins, like collagen and elastin fibers that are responsible for ECM’s structure, tensile strength, resiliency, reversible extensibility, and deformability and the second class is comprised of proteoglycans composed of glycosaminoglycan (GAG) chains covalently attached to protein cores that are multifunctionally involved in signaling pathways and cell interactions. ECM is present within all tissues and organs and changes in ECM structure contribute to pathogenesis, e.g. wounded and fibrotic tissue, COPD or tumours.
This thesis primarily focuses on the development of a diagnostic peptide system, that enables to gain information on MMP activity from ECM by deploying the isobaric mass encoding strategy. The core element of the developed system is an isotopically labelled peptide sequence (mass tag), that is released in response to elevated levels of MMPs and allows multiplexed detection in tandem mass spectrometry (LC-MS/MS). The mass reporters possess a modular structure with different functionalities. C-terminal either a transglutaminase (TG) recognition sequence or a high molecular weight polyethylene glycol (PEG) moiety was attached to immobilize the mass reporters covalently or physically at the injection site. The following matrix metalloproteinase substrate sequence (MSS) is incorporated in two different versions with different sensitivity to MMPs. The MSS were applied in pairs for relative quantification consisting of the cleavable version synthesized with natural L-amino acids and the non-cleavable D-amino acid variant. The mass tag was synthesized with isotopically labelled amino acids and is separated from the MSS by a UV light-sensitive molecule. N-terminal the mass tag is followed by a tobacco etch virus protease (TEV) sensitive sequence, that is responsible to separate the mass tag from the affinity tag, which was either the Strep-tag II sequence or biotin and were added for purification purposes.
Chapter 1 presents a step-by-step protocol on how to design a mass tag family allowing for multiplexed analysis by LC-MS/MS. The multiplexing is achieved by developing an isobar mass tag family with four family members, which are chromatographically indistinguishable, but due to the mass encoding principles they fragment in distinct y-type ions with a mass difference of 1 or 2 Da each in MS2. Furthermore, it is explained how to covalently attach the mass reporter peptides onto ECM by the activated calcium-catalyzed blood coagulation transglutaminase factor XIII (FXIIIa). The lysine of mass reporter’s TG sequence (D-domain of insulin-like growth factor-I (IGF-I)) and a glutamine in fibronectin are covalently crosslinked by FXIIIa and build an isopeptide bond. Elevated levels of MMP release the mass reporters from ECM by recognizing the inter-positioned MSS.
The designed mass reporters were able to monitor enzyme activity in an in vitro setting with cell-derived ECM, which was shown in Chapter 2. The modular structured mass reporters were investigated in a proof of concept study. First, the different modules were characterized in terms of their MMP responsiveness and their sensitivity to TEV protease and UV light. Then the FXIIIa-mediated coupling reaction was detailed and the successful coupling on ECM was visualized by an immunosorbent assay or confocal laser scanning microscopy. Finally, the immobilized mass reporters on ECM were incubated with MMP-9 to investigate their multiplexing ability of MMP activity. The cleaved mass reporter fragments were purified in three steps and mass tags were analyzed as mix of all four in LC-MS/MS.
Chapter 3 describes the change from an immobilizing system as seen in chapter 1 and 2 to a soluble enzyme activity monitoring system that was applied in an osteoarthritic mouse model. Instead of the immobilizing TG sequence the C-terminal MMS was extended with two amino acids where one holds an azide moiety to perform a strain-promoted azide-alkyne cycloaddition to a high molecular weight dibenzocyclooctyne-polyethylene glycol (DBCO-PEG), which was chosen to retain the mass reporters at the injection site. Furthermore, the N-terminal affinity tag was extended with a 2.5 kDa PEG chain to increase the half-life of the mass reporter peptides after MMP release. The systems biocompatibility was proved but its enzyme monitoring ability in an in vivo setting could not be analyzed as samples degraded during shipping resulting from the Chinese customs blocking transport to Germany.
In summary the diagnostic peptide system was developed in two variants. The immobilized version one from chapter 1 and 2 was designed to be covalently attached to ECM by the transglutaminase-mediated cross-linking reaction. In an in vitro setting the functionality of the mass reporter system for the detection of MMP activity was successfully verified. The second variant comprises of a soluble mass reporter system that was tested in an OA mouse model and showed biocompatibility. With these two designed systems this thesis provides a flexible platform based on multiplexed analysis with mass-encoded peptides to characterize cell culture models regarding their MMP activity, to deploy cell-derived ECM as endogenous depot scaffold and to develop a mass tag family that enables simultaneous detection of at least four mass tags.
While life expectancy increases worldwide, treatment of neurodegenerative diseases such as AD becomes a major task for industrial and academic research. Currently, a treatment of AD is only symptomatical and limited to an early stage of the disease by inhibiting AChE. A cure for AD might even seem far away. A rethinking of other possible targets is therefore necessary. Addressing targets that can influence AD even at later stages might be the key. Even if it is not possible to find a cure for AD, it is of great value for AD patients by providing an effective medication. The suffering of patients and their families might be relieved and remaining years may be spent with less symptoms and restrictions.
It was shown that a combination of hCB2R agonist and BChE inhibitor might exactly be a promising approach to combat AD. In the previous chapters, a first investigation of dual-acting compounds that address both hCB2R and BChE was illustrated (figure 6.1).
A set of over 30 compounds was obtained by applying SARs from BChE inhibitors to a hCB2R
selective agonist developed by AstraZeneca. In a first in vitro evaluation compounds showed
selectivity over hCB1R and AChE. Further investigations could also prove agonism and showed
that unwanted off-target affinity to hMOP receptor could be designed out. The development of
a homology model for hCB2R (based on a novel hCB1R crystal) could further elucidate the
mode of action of the ligand binding. Lastly, first in vivo studies showed a beneficial effect of
selected dual-acting compounds regarding memory and cognition.
Since these first in vivo studies mainly aim for an inhibition of the BChE, it should be the aim
of upcoming projects to proof the relevance of hCB2R agonism in vivo as well. In addition,
pharmacokinetic as well as solubility studies may help to complete the overall picture.
Currently, hybrid-based dual-acting hCB2R agonists and selective BChE inhibitors are under
investigation in our lab. First in vitro evaluations showed improved BChE inhibition and
selectivity over AChE compared to tacrine.78 Future in vitro and in vivo studies will clarify their
usage as drug molecules with regard to hepatotoxicity and blood-brain barrier penetration.
Since the role of hCB2R is not yet completely elucidated, the use of photochromic toolcompounds
becomes an area of interest. These tool-compounds (and their biological effect) can
be triggered upon irradiation with light and thus help to investigate time scales and ligand
binding.
A set of 5-azobenzene benzimidazoles was developed and synthesized. In radioligand binding
studies, affinity towards hCB2R could be increased upon irradiation with UV-light (figure 6.2).
This makes the investigated compounds the first GPCR ligands that can be activated upon
irradiation (not vice versa).
The aim of upcoming research will be the triggering of a certain intrinsic activity by an
“efficacy-switch”. For this purpose, several attempts are currently under investigation: an
introduction of an azobenzene moiety at the 2-position of the benzimidazole core already led to
a slight difference in efficacy upon irradiation with UV light. Another approach going on in our
lab is the development of hCB1R switches based on the selective hCB1R inverse agonist
rimonabant. First in vitro results are not yet available (figure 6.3).
Opioid receptors (ORs) are classified among the oldest and best investigated drug targets due to their fundamental role in the treatment of pain and related disorders. ORs are divided in three conventional subtypes (μ, κ, δ) and the non‐classical nocicepetin receptor. All ORs are family A G protein‐coupled receptors (GPCRs), and are located on the cell surface. Modern biophysical methods use light to investigate physiological processes at organismal, cellular and subcellular level. Many of these methods rely on fluorescent ligands, thus highlighting their importance. This review addresses the advancements in the development of opioid fluorescent ligands and their use in biological, pharmacological and imaging applications.
Over the past decades, awareness has increased of multiple health-promoting effects of diets rich in anthocyanins and proanthocyanidins and, specifically, of these compounds’ potential for conferring neuroprotection. The present study compiles evidence obtained in vitro that expands our understanding of anthocyanin and proanthocyanidin functionalities at multiple levels. Firstly, anthocyanin and anthocyanidin bioavailability was addressed using a combination of ATPase assays, dye extrusion assays and vesicular transport assays. This approach highlights the contribution made by efflux transporters MDR1 and BCRP to the absorption of berry polyphenols and to their distribution to target tissues including the central nervous system. All test compounds interacted with the BCRP transporter in vitro, seven emerged as potential BCRP substrates and 12 as potential inhibitors of BCRP. Two anthocyanidins, malvidin and petunidin, exhibited bimodal activities, serving as BCRP substrates at low micromolar concentrations and, at higher concentrations, as BCRP inhibitors. Effects on MDR1, in contrast, were weak, as only aglycones exerted mild inhibitory activity in the high micromolar range. Distinct affinities of several anthocyanins and the respective aglycones for BCRP suggest that they may be actively transported out of endothelia. Agents that interfere with BCRP activity are therefore likely to facilitate crossing of the intestinal and blood-brain barriers and to augment anthocyanin bioavailability. Secondly, novel modes of action were sought to rationalize berry polyphenols’ direct modulation of neuronal transmission as opposed to their non-specific antioxidant activities. The candidate effectors include cellular monoamine oxidases (MAO) A and B, hypoxia inducible factor (HIF), the proteasome, and phospholipase A2 (PLA2). Elevated MAO activity has long been implicated in the etiology of depression, anxiety and neurodegenerative illness. MAO inhibiting compounds may thus hold promise in the prevention of behavioral symptoms and cognitive decline. For both MAO isoforms, inhibitory effects of anthocyanins and anthocyanidins are illustrated by IC50 values in the low micromolar range whereas proanthocyanidins and phenolic metabolites were less effective inhibitors. Kinetic analyses, performed with cyanidin and cyanidin-3-glucoside, indicated a competitive interaction of cyanidin in terms of MAO A, plus a mixed competitive and non-competitive mode of interaction of cyanidin in terms of MAO B as well as of cyanidin-3-glucoside with respect to both enzyme isoforms. Thus MAO inhibition by anthocyanins and their aglycones in vitro lends support to central nervous functionalities of diets rich in berry polyphenols and opens new opportunities in the prevention of neuronal pathologies. Effects on HIF expression were examined to assess candidate compounds’ role in enhancing cellular resistance to oxidative stress. By inducing a dose-dependent increase in HIF expression, delphinidin may initiate a variety of cellular survival processes that are inhibited by free iron. This finding argues in favor of iron-chelating properties as a further means of mediating neuroprotection. Other inducers of HIF expression in neuroblastoma cells included gallic acid, cyanidin and bilberry extract, all of which may modulate HIF-dependent transcription of downstream genes.
In der vorliegenden Arbeit wurden die Faktoren, die die Wirksamkeit und Leistungsfähigkeit nanoskaliger Fließregulierungsmittel beeinflussen anhand repräsentativer Vertreter aus vier verschiedenen Hauptgruppen von Nanomaterialien untersucht. Durch Variation der Energieeinträge, mittels unterschiedlicher effektiver Fallstrecken des Mischzylinders, konnte eine ansteigende Potenz für alle Nanomaterialien beobachtet werden. Das hydrophobe Aerosil R 972, welches eine geringe Agglomeratstabilität aufweist, zeichnet sich durch das höchste fließregulierende Potential aus. Zuswammenfassend konnte gezeigt werden , dass die in den Nanomaterial-Agglomeraten auftertenden Wechselwirkungen, die Größe der Agglomerate und deren Adsorptionsrate die bestimmenden Faktoren der Fließeigenschaft von Pulvern sind.
Zusammenfassend stellen sich die hydrophoben Nanomaterialien als die optimalen Fließregulierungsmittel dar (Ausnahme: Printex® G). Die Agglomerate des hochpotenten hydrophoben Ruß-Derivats Printex® 95 liegen von Herstellerseite bereits in genügend zerkleinerter Form vor, so daß keine weitere Zerkleinerung während des Mischvorganges erforderlich ist. Infolgedessen adsorbiert es mit höchster Geschwindigkeit an die Oberfläche der Schüttgutpartikel und übernimmt dort die Funktion von Oberflächenrauhigkeiten. In der Folge der werden die interpartikulären Haftkräfte sehr schnell minimiert. Im Gegensatz zu den hydrophilen Nanomaterialien zeigt Printex® 95 keinen ausgeprägten Wiederanstieg der Zugspannungen selbst nach sehr langen Mischzeiten von 4320 Minuten. Durch die Verwendung des hydrophoben Ruß-Derivates Printex® 95 werden Pulvermischungen erhalten, die zudem weitestgehend unempfindlich sind gegenüber Kapillarkräften bei erhöhten Umgebungsfeuchten. Das hydrophobe Printex® 95 vereint damit praktisch alle gewünschten Eigenschaften eines optimalen Fließregulierungsmittels und es kann als Modellsubstanz für die Entwicklung noch potenterer Nanomaterialien dienen. Bisher stand das nicht abschließend beurteilte cancerogene Potential dieses Stoffes einer breiten Anwendung entgegen.
In der vorliegenden Arbeit werden Studien zu verschiedenen Aspekten der Stimulation von humanen Vg9Vd2-T-Lymphozyten vorgestellt. Ein Schwerpunkt war die Charakterisierung der Erkennung von Bisphosphonaten durch Vg9Vd2-T-Zellen. Weder die Alkylmonophosphonate Ethyl- und Propylphosphonat noch 3-Aminopropylphosphonat bewirkten eine Stimulation von Vg9Vd2 T-Lymphozyten. Anscheinend ist also für die gd-T-Zell-stimulierende Aktivität von Aminobisphosphonaten das Vorhandensein sowohl der Methylenbisphosphonat-Gruppe als auch des Amino-Stickstoffs entscheidend. Es wurden verschiedene Pamidronat-Derivate untersucht, die sich durch Substituenten am Stickstoffatom unterscheiden. Die meisten dieser Verbindungen konnten Vg9Vd2-T-Zellen aktivieren, die Art der Substituenten hatte aber großen Einfluss darauf, welche Konzentration des jeweiligen Bisphosphonats für eine gd-T-Zell-Antwort nötig war. Besonders negativ auf die gd-T-Zell-stimulierende Aktivität wirkte sich aus, wenn das Stickstoffatom Teil einer Säureamidbindung war. Das lässt darauf schließen, dass die Gegenwart einer positiven Ladung (durch Protonierung des Stickstoffatoms) von Bedeutung für die Bioaktivität dieser Verbindungen ist. Beim Vergleich verschiedener Bisphosphonate mit stickstoffenthaltenden Heteroaromaten (Fünfringe mit ein bis drei Stickstoffatomen) zeigte sich, dass sowohl die Position des basischen Stickstoffatoms im Ring als auch Art und Position von Ringsubstituenten Einfluss auf deren gd-T-Zell-stimulierende Aktivität haben. Es ergaben sich Hinweise, dass sich eine gesteigerte Neigung eine positive Ladung in der Seitenkette zu tragen bei diesen Verbindungen genau wie bei Aminobisphosphonaten günstig auf das gd-T-Zell-aktivierende Potential auswirkt. Durch Behandlung mit Zoledronat wurde die monozytäre Zelllinie THP-1 stimulierend für Vg9Vd2-T-Zellen. Auch weitere Zelllinien und Lymphozyten des peripheren Bluts (PBL) konnten nach Vorinkubation mit Zoledronat Vg9Vd2-T-Zellen aktivieren. Dabei genügten bei den PBL deutlich geringere Zoledronat-Konzentrationen um einen Effekt zu erzielen als bei den untersuchten Zelllinien. Für die indirekte Stimulation von Vg9Vd2-T-Zellen durch Zoledronat mittels THP-1 Zellen oder PBL war Zell-Zell-Kontakt zwischen den präsentierenden Zellen und den gd-T-Zellen Voraussetzung. Die Anwesenheit von alkalischer Phosphatase hatte keine Auswirkungen auf die gd-T-Zell-Aktivierung durch Zoledronat. Dies spricht dafür, dass Vg9Vd2-T-Zellen Oberflächenstrukturen auf anderen Zellen erkennen und dass freie Phosphoantigene bei der gd-T-Zell-Stimulierung durch Stickstoff enthaltende Bisphosphonate keine Rolle spielen. Wurde die Vorinkubation von THP-1 Zellen mit Zoledronat in Gegenwart von Saponin, einem Detergenz das die Durchlässigkeit der Zellmembran reversibel erhöht, durchgeführt, reichten deutlich niedrigere Konzentrationen des Bisphosphonats aus, um die THP-1 Zellen stimulierend für gd-T-Lymphozyten zu machen. Das ist ein Hinweis darauf, dass für die Aktivierung von Vg9Vd2-T-Zellen durch Zoledronat intrazelluläre Vorgänge in den „antigenpräsentierenden“ Zellen verantwortlich sein könnten. Beim Vergleich verschiedener N-BPs hinsichtlich ihrer Aktivität gegenüber gd-T-Zellen und ihrer antiresorptiven Potenz ergab sich eine erstaunlich gute Korrelation. Dies könnte darauf hinweisen, dass beide Effekte durch den gleichen Mechanismus – die Hemmung der Farnesylpyrophosphat-Synthase – zustande kommen. Die Gegenwart von Farnesol oder Geranylgeraniol während der Vorinkubation von THP-1 Zellen mit Zoledronat verringerte deren gd-T-Zell-stimulierendes Potential nicht, so dass vielleicht nicht die Verarmung an längerkettigen Isoprenoiden sondern die Anreicherung von Vorläufern zu Veränderungen in den Zellen führt, die diese schließlich erkennbar für Vg9Vd2-T-Zellen machen. Zusätzlich wurden im Rahmen dieser Arbeit einige Versuche zu bakteriellen Phosphoantigenen durchgeführt. Mittels einer selektiven HPLC-MS/MS-Methode gelang uns in einer E. coli-Probe der Nachweis eines Vg9Vd2-T-Zell-stimulierenden Pyrophosphats mit der molekularen Masse von 3-Formyl-1-butyl-pyrophosphat, einem Phosphoantigen das in Mykobakterien gefunden worden war (Belmant und Mitarbeiter, 1999). Eine weitere Strukturaufklärung war aufgrund der äußerst geringen Konzentration des Phosphoantigens nicht möglich. 2-C-Methyl-D-erythritol-2,4-cyclodiphosphat (MEcPP) ist ein Zwischenprodukt des 2-C-Methylerythritol-4-phosphat- (MEP) Wegs der Isoprenoidbiosynthese. Es wird in manchen Bakterien – z. B. Corynebacterium ammoniagenes – bei oxidativem Stress verursacht durch Benzylviologen (BV) akkumuliert. Es konnte gezeigt werden, dass Extrakte aus C. ammoniagenes, die in Gegenwart von BV kultiviert wurden, in einem höherem Maße Vg9Vd2-T-Zellen stimulieren als Proben von Bakterien, die ohne BV-Zusatz wuchsen; MEcPP wirkte selbst nicht als Phosphoantigen. Dies war ein weiterer Hinweis darauf, dass bakterielle Phosphoantigene mit dem MEP-Weg assoziiert sind.
Marine natural products have achieved great success as an important source of new lead compounds for drug discovery. The Red Sea provides enormous diversity on the biological scale in all domains of life including micro- and macro-organisms. In this review, which covers the literature to the end of 2019, we summarize the diversity of bioactive secondary metabolites derived from Red Sea micro- and macro-organisms, and discuss their biological potential whenever applicable. Moreover, the diversity of the Red Sea organisms is highlighted as well as their genomic potential. This review is a comprehensive study that compares the natural products recovered from the Red Sea in terms of ecological role and pharmacological activities.