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5-Lipoxygenase (5-LO) catalysis is positively regulated by Ca2+ ions and phospholipids that both act via the N-terminal C2-like domain of 5-LO. Previously, we have shown that 1-oleoyl-2-acetylglycerol (OAG) functions as an agonist for human polymorphonuclear leukocytes (PMNL) in stimulating 5-LO product formation. Here we have demonstrated that OAG directly stimulates 5-LO catalysis in vitro. In the absence of Ca2+ (chelated using EDTA), OAG strongly and concentration-dependently stimulated crude 5-LO in 100,000 x g supernatants as well as purified 5-LO enzyme from PMNL. Also, the monoglyceride 1-O-oleyl-rac-glycerol and 1,2-dioctanoyl-sn-glycerol were effective, whereas various phospholipids did not stimulate 5-LO. However, in the presence of Ca2+, OAG caused no stimulation of 5-LO. Also, phospholipids or cellular membranes abolished the effects of OAG. As found previously for Ca2+, OAG renders 5-LO activity resistant against inhibition by glutathione peroxidase activity, and this effect of OAG is reversed by phospholipids. Intriguingly, a 5-LO mutant lacking tryptophan residues (Trp-13, -75, and -102) important for the binding of the 5-LO C2-like domain to phospholipids was not stimulated by OAG. We conclude that OAG directly stimulates 5-LO by acting at a phospholipid binding site located within the C2-like domain.
Die Fähigkeit der spezifischen und kontextabhängigen zellulären Adaption auf intrinsische und/oder extrinsische Signale ist das Fundament zellulärer Homöostase. Verschiedene Signale werden von Membranrezeptoren oder intrazellulären Rezeptoren erkannt und ermöglichen die molekulare Anpassung zellulärer Prozesse. Komplexe, ineinandergreifende Proteinnetzwerke sind dabei elementar in der Regulation der Zelle. Proteine und deren Funktionen werden dabei nach Bedarf reguliert und unterliegen einem ständigen proteolytischen Umsatz.
Die stimulusabhängige Gentranskription und/oder Proteintranslation nimmt hier eine zentrale Stellung ein, da die zugrundeliegende Maschinerie die Komposition und Funktion der Proteinnetzwerke entsprechend anpassen kann. Zusätzlich zur Regulation der Proteinabundanz werden Proteine posttranslational modifiziert, um deren Eigenschaften rasch zu ändern. Zu posttranslationalen Modifikationen zählen die Ubiquitinierung und/oder Phosphorylierung, welche die Proteinfunktionen hochdynamisch regulieren. Deregulierte Proteinnetzwerke werden oft mit Neurodegeneration und Autoimmun- oder Krebserkrankungen assoziiert. Auch Infektionen mit humanpathogenen Bakterien greifen stark in den Regulierungsprozess von Proteinnetzwerken und deren Funktionen ein. Die zelluläre Homöostase wird dadurch herausgefordert.
Bakterien der Gattung Salmonella sind zoonotische, gramnegative, fakultativ intrazelluläre Pathogene, welche weltweit millionenfach Salmonellen-erkrankungen hervorrufen. Von besonderer Bedeutung ist dabei Salmonella enterica serovar Typhimurium (hiernach Salmonella), welches im Menschen, meist durch mangelnde Hygienemaßnahmen, Gastroenteritis auslöst.
Immunität in Epithelzellen wird über das angeborene Immunsystem vermittelt und dient der Pathogenerkennung und -bekämpfung. Die Toll-like Rezeptoren (TLR) gehören zu den Mustererkennungsrezeptoren (pattern recognition receptors), welche spezifische mikrobielle Strukturen detektieren und eine kontextabhängige zelluläre Antwort generieren. Danger-Rezeptoren erkennen hingegen nicht direkt das Pathogen, sondern zelluläre Perturbationen, welche durch Zellschäden oder bakterielle Invasionen verursacht werden. Die intrinsische Fähigkeit der Wirtszelle, sich gegen Infektionen/Gefahren zu wehren wird dabei als zellautonome Immunität bezeichnet. Dabei nehmen induzierte proinflammatorische Signalwege und zelluläre Stressantworten eine wichtige Stellung ein. Die zelluläre Stressantwort aktiviert unter anderem die selektive Autophagie. Diese kann spezifisch aberrante Organelle, Proteine und invasive Pathogene abbauen. Ein weiterer Stresssignalweg ist die integrated stress response (ISR), welche eine selektive Proteintranslation erlaubt und damit die Auflösung des proteintoxischen Stresses ermöglicht.
Zur Penetration von Epithelzellen benötigt Salmonella ein komplexes System an Virulenzfaktoren, welches die bakterielle Internalisierung und Proliferation in der Wirtszelle ermöglicht. Salmonella nutzt dazu ein Typ-III-Sekretionssystem. Das System sekretiert bakterielle Virulenzfaktoren in die Zelle, sodass eine hochspezifische Modulierung des Wirtes erzwungen wird.
Die Virulenzfaktoren SopE und SopE2 spielen dabei eine Schlüsselrolle, da sie die Pathogenität von Salmonella maßgeblich vermitteln. Durch molekulare Mimikry von Wirts GTP (Guanosintriphosphat) -Austauschfaktoren aktivieren SopE und SopE2 die Rho GTPasen CDC42 und Rac1. GTP-geladenes CDC42 und Rac1 wiederum aktivieren das Aktinzytoskelett und stimulieren die Polymerisierung von Aktinfilamenten über den Arp2/3-Komplex an der Invasionsstelle. Das Pathogen wird dadurch in ein membranumhülltes Vesikel, die sogenannte Salmonella-containing Vakuole (SCV), aufgenommen. Die SCV stellt eine protektive, replikative, intrazelluläre Nische des Pathogens dar und wird permanent durch verschiedene Virulenzfaktoren moduliert.
Im Allgemeinen führt die Aktivierung von Mustererkennungsrezeptoren und Danger-Rezeptoren also zu einer zellulären Stressantwort und Entzündungsreaktion, wodurch es zur Bekämpfung der Infektion kommt. Inflammatorische Signalwege werden meist über den zentralen Transkriptionsfaktor NF-κB (nuclear factor 'kappa-light-chain-enhancer' of activated B-cells) vermittelt. NF-κB bewirkt die Induktion von proinflammatorischen Effektoren und Stressgenen. Zellautonome Immunität wird zusätzlich durch antibakterielle Autophagie ermöglicht, wobei Salmonella selektiv über das lysosomale System abgebaut werden. Das bakterielle Typ-III-Sekretionssystem verursacht an einigen wenigen SCVs Membranschäden, sodass Salmonella das Wirtszytosol penetrieren. Zytosolische Bakterien werden dabei spezifisch ubiquitiniert. Dies erlaubt die Erkennung durch die Autophagie-Maschinerie.
In der vorliegenden Arbeit wurde die zellautonome Immunität von Epithelzellen während einer akuten Salmonella Infektion durch quantitative Proteomik untersucht...