Zusammenfassung
Altern und Lebensdauer werden nach jetzigem Wissensstand wesentlich durch folgende Faktoren bestimmt: – Oxidative Schäden der DNA, von Proteinen und Lipiden, darunter Schäden besonders an Mitochondrien. Eine Akkumulation solcher Schäden findet sich vor allem in postmitotischen Geweben wie Nerven- und Muskelzellen. – Verkürzung der Chromosomenenden. – Instabilität des Genoms. – proliferative Seneszenz der Zelle. – programmierten Zelltod (Apoptose). – Genpolymorphismen/Gendefekte, die die Reparatur z. B. von DNA-Schäden oder die Resistenz gegen die schädigenden Radikale vermindern, aber auch Stoffwechselgleichgewichte verändern. – Verringerte Nahrungszufuhr bewirkt eine Verlängerung der Lebensdauer bei Modellorganismen, beim Menschen sind die Befunde noch unklar. Dieser Faktor wirkt offenbar über den Insulin/Insulin-like growth factor-Signalweg, der bei erhöhter Aktivierung eine frühzeitigere Seneszenz von Geweben bewirkt. Verursacher der zellulären Schäden sind hauptsächlich reaktive Sauerstoffspezies (ROS) und Stickstoffspezies (RNS), wobei die meisten ROS als Nebenprodukt der mitochondrialen Atmungskette gebildet werden. Die eigene zelluläre Abwehr gegen ROS/RNS ist ein wichtiger Faktor gegen den Alterungsprozess. Die Antioxidantien werden z. T. mit der Nahrung aufgenommen (z. B. Vitamine A, C, E), eine zuverlässige Therapie mit Antioxidantien ist allerdings immer noch nicht etabliert. Gesunde Ernährung und Bewegung sind weiterhin die wichtigsten Komponenten für einen gesunden Alterungsprozess.
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Rensing, L., Rippe, V. (2014). Zelluläre Mechanismen des Alterns. In: Altern. Springer Spektrum, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-37733-4_2
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