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Molecular and Cellular Biology, October 2001, p. 6748-6757, Vol. 21, No. 20
Department of Molecular Biology, Cell
Biology, and Biochemistry, Brown University, Providence, Rhode Island
02912
Received 29 May 2001/Returned for modification 9 July 2001/Accepted 9 July 2001
Following a proliferative phase of variable duration, most normal
somatic cells enter a growth arrest state known as replicative senescence. In addition to telomere shortening, a variety of
environmental insults and signaling imbalances can elicit phenotypes
closely resembling senescence. We used p53
0270-7306/01/$04.00+0 DOI: 10.1128/MCB.21.20.6748-6757.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
Role of p14ARF in Replicative and
Induced Senescence of Human Fibroblasts
and
/
and
p21
/
human fibroblast cell strains constructed by gene
targeting to investigate the involvement of the Arf-Mdm2-p53-p21
pathway in natural as well as premature senescence states. We propose
that in cell types that upregulate p21 during replicative exhaustion, such as normal human fibroblasts, p53, p21, and Rb act sequentially and
constitute the major pathway for establishing growth arrest and that
the telomere-initiated signal enters this pathway at the level of p53.
Our results also revealed a number of significant differences between
human and rodent fibroblasts in the regulation of senescence pathways.
*
Corresponding author. Mailing address: Department of
Molecular Biology, Cell Biology, and Biochemistry, Box G-J223, Brown University, Providence, RI 02912. Phone: (401) 863-9654. Fax: (401)
863-9653. E-mail: john_sedivy{at}brown.edu.
Present address: Department of Biology, Roger Williams University,
Bristol, RI 02809.
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