Ist Sauerstoffmangel immer nur schädlich?
Abstract
Zusammenfassung. Die Aufgabe des Kreislaufs ist die Versorgung von Gewebe mit Sauerstoff und Nährstoffen. Zustände des Sauerstoffmangels (Hypoxie) werden als bedrohlich erachtet, da abhängig vom Ausprägungsgrad Zellen absterben, sei es durch apoptotische oder nekrotische Vorgänge. Dem versucht das Gewebe durch evolutionär erhaltene Signalwege entgegenzuwirken, z.B. über den nukleären Hypoxie-induzierbaren Faktor, der das Gewebe schützen soll, indem er das Überleben der Zellen fördert und gleichzeitig in Angiogenese, Hämatogenese und Stoffwechselprozesse eingreift. Neuere Erkenntnisse weisen darauf hin, dass gerade diese konservierten Signalwege auch therapeutische Ansätze in der Wundheilung von Knochen und Haut sowie in der Regeneration von Geweben, z.B. der Leber, und dem hämatopoetischen System, bedeuten können.
Abstract. The role of the cardiovascular circulation is to supply tissue with oxygen and nutrients. Oxygen deficiency (hypoxia) is considered life-threatening, since cells die, either through apoptotic or necrotic processes. Tissue tries to counteract this by means of evolutionary signalling pathways, such as the nuclear hypoxia-inducible factor, which protects the tissue by promoting cell survival strategies and simultaneously intervening in angiogenesis, haematogenesis and metabolic processes. Recent findings indicate that these conserved signalling pathways can also function as therapeutic approaches in wound healing of bones and skin, as well as in the regeneration of tissues, e.g. in the liver, and in the hematopoietic system.
Résumé. Le rôle de la circulation est de fournir aux tissus de l’oxygène et des nutriments. Les conditions de carence en oxygène (hypoxie) sont considérées comme menaçantes, car les cellules meurent en fonction de leur degré de développement, soit par des processus apoptotiques ou nécrotiques. Le tissu tente d’y remédier par des voies de signalisation, comme le facteur nucléaire inductible à l’hypoxie unfacteur qui vise à protéger le tissu en favorisant la survie cellulaire et en intervenant simultanément dans l’angiogenèse, l’hématogenèse et les processus métaboliques. Des résultats récents indiquent que ces voies de signalisation peuvent également représenter des approches thérapeutiques dans la cicatrisation des os et de la peau, ainsi que dans la régénération des tissus, par exemple le foie, et le système hématopoïétique.
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