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American Journal of Clinical Nutrition, Vol 55, 1208S-1214S, Copyright © 1992 by The American Society for Clinical Nutrition, Inc

REVIEW ARTICLES

Apoptosis--programmed cell death: a role in the aging process?

D Monti, L Troiano, F Tropea, E Grassilli, A Cossarizza, D Barozzi, MC Pelloni, MG Tamassia, G Bellomo and C Franceschi
Istituto di Patologia Generale, Universita degli Studi di Modena, Italy.

Cells continuously exposed to genotoxic agents, such as oxygen free radicals (OFRs), deeply involved in the aging process use a variety of cellular defense mechanisms. These defense mechanisms include DNA repair enzymes, antioxidants, poly(ADP-ribosyl)polymerase (pADPRP), and stress proteins and they constitute an integrated network. An age- related failure of the efficiency of this network can affect cell proliferation and cell death, two phenomena tightly linked and regulated. Recent data from our laboratory on the role of DNA damage and pADPRP activation and on the type of cell death induced by OFRs in human lymphocytes are reviewed. In vitro and in vivo data on possible strategies to reduce oxidative stress in lymphocytes from normal and Down syndrome subjects, by using natural compounds and trace elements, are presented. They indicate that nicotinamide and L-carnitine protect human cells from OFR-induced damage and suggest that they are possible candidates as antiaging substances.


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Copyright © 1992 by The American Society for Nutrition