 | MOLECULAR AND CELLULAR GERONTOLOGY
Copyright © 2000 by the New York Academy of Sciences
description
Annals of the New York Academy of Sciences 908:111-125 (2000)
© 2000 New York Academy of Sciences
Replicative Senescence and Oxidant-Induced Premature Senescence: Beyond the Control of Cell Cycle Checkpoints
QIN M. CHENa
Department of Pharmacology, University of Arizona, Skaggs Pharmaceutical Science Building, 1703 E. Mabel Street, Tucson, Arizona 85721, USA
aPhone: 520-626-9126; fax: 520-626-2466.
chen{at}pharmacy.arizona.edu.
Normal human diploid fibroblasts (HDFs) undergo replicative senescence inevitably in tissue culture after a certain number of cell divisions. A number of molecular changes observed in replicative senescent cells occur in somatic cells during the process of aging. Genetic studies on replicative senescence indicate the control of tumor suppression mechanisms. Despite the significance of replicative senescence in aging and cancer, little is known about the central cause of the complex changes observed in replicative senescent cells. The interest in the phenomenon has intensified in recent years, since damaging agents, certain oncogenes and tumor suppressor genes have been found to induce features of senescence in early passage young HDFs or in immortalized tumor cells. The reported features of senescence are summarized here in order to clarify the concept of replicative senescence or premature senescence. The experimental results of extending the replicative life span by reducing ambient oxygen tension or by N-tert-butyl-alpha-phenylnitrone (PBN) argue a role of oxidative damage in replicative senescence. By inducing premature senescence with a pulse treatment of H 2O 2, we can study the role of the cell cycle checkpoint proteins p53, p21, p16 and Rb in gaining each feature of senescence. Although p53 and Rb control G1 arrest and Rb appears to control cell enlargement, activation of the senescent associate ß-galactosidase, loss of cell replication and multiple molecular changes observed in premature senescent or replicative senescent cells are likely controlled by mechanisms beyond the cell cycle checkpoints.
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