Résumé
Le vieillissement est une perte progressive et inéluctable des capacités fonctionnelles de l’organisme. Des caractéristiques socio-économiques, des facteurs génétiques et le genre influent sur ce processus et en déterminent la complexité. Les mécanismes moléculaires et cellulaires, qui fondent la physiologie du vieillissement et de la longévité, commencent à être mieux élucidés. Souvent ambivalents, ils sont aussi impliqués dans la survenue de nombreuses pathologies liées à l’âge. Certains d’entre-eux (les principaux) sont décrits dans cet article (restriction calorique, séquences télomériques, klotho, Apolipoprotéine E, voie de signalisation mTOR, axe IGF-1/PI3 kinase/insuline, sirtuines, autophagie, radicaux libres, etc.). Une meilleure compréhension de ces mécanismes suscite beaucoup d’espoirs en termes de prévention et de perspectives thérapeutiques. Néanmoins, des dérives éthiques possibles sont redoutées. Le vieillissement est, ainsi, un enjeu sociétal et de santé publique aussi bien dans les pays développés que dans les pays en développement. Le problème de sa prise en charge se posera avec acuité devant l’augmentation de l’espérance de vie et du nombre de personnes âgées dans le monde.
Abstract
Aging is known as a process leading to a progressive and relentless decline of functional capacities. Social, economic, gender and genetic factors are key modulators of its complexity. A better understanding of cellular and molecular mechanisms that underlie aging and life span physiology is slowly but surely occurring. Here, we give a comprehensive synthesis of the main biological mechanisms controlling aging and aging related diseases (caloric restriction, telomeric sequences, Klotho, Apolipoproteine E, mTOR pathway, IGF-1/PI3 kinase/insulin axis, sirtuins, autophagy, free radicals...). Promising hopes in terms of aging prevention and therapeutic perspectives are made in the near future. Nevertheless, general public fear ethical excesses. At all events, aging is becoming a social and public health stake in developed and developing countries. The elderly care management will be a huge issue regarding the enhancement of life span and the growing number of seniors worldwide.
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Ly, A., Shevelev, A., Andres, C. et al. Mécanismes et pathologies du vieillissement. J Afr Cancer 5, 103–113 (2013). https://doi.org/10.1007/s12558-013-0270-4
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DOI: https://doi.org/10.1007/s12558-013-0270-4