MCB
Home Help [Feedback] [For Subscribers] [Archive] [Search] [Contents]
This Article
Right arrow Full Text
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrowReprints and Permissions
Right arrow Copyright Information
Right arrow Books from ASM Press
Right arrow MicrobeWorld
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Alexander, K.
Right arrow Articles by Hinds, P. W.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Alexander, K.
Right arrow Articles by Hinds, P. W.

 Previous Article  |  Next Article 

Molecular and Cellular Biology, June 2001, p. 3616-3631, Vol. 21, No. 11
0270-7306/01/$04.00+0   DOI: 10.1128/MCB.21.11.3616-3631.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Requirement for p27KIP1 in Retinoblastoma Protein-Mediated Senescence

Kamilah Alexander and Philip W. Hinds*

Department of Pathology, Harvard Medical School, Boston, Massachusetts 02115

Received 21 December 2000/Returned for modification 25 January 2001/Accepted 14 March 2001

In vivo and in vitro evidence indicate that cells do not divide indefinitely but instead stop growing and undergo a process termed cellular proliferative senescence. Very little is known about how senescence occurs, but there are several indications that the retinoblastoma protein (pRb) is involved, the most striking being that reintroduction of RB into RB-/- tumor cell lines induces senescence. In investigating the mechanism by which pRb induces senescence, we have found that pRb causes a posttranscriptional accumulation of the cyclin-dependent kinase inhibitor p27KIP1 that is accompanied by an increase in p27KIP1 specifically bound to cyclin E and a concomitant decrease in cyclin E-associated kinase activity. In contrast, pRb-related proteins p107 and p130, which also decrease cyclin E-kinase activity, do not cause an accumulation of p27KIP1 and induce senescence poorly. In addition, the use of pRb proteins mutated in the pocket domain demonstrates that pRb upregulation of p27KIP1 and senescence induction do not require the interaction of pRb with E2F. Furthermore, ectopic expression of p21CIP1 or p27KIP1 induces senescence but not the morphology change associated with pRb-mediated senescence, uncoupling senescence from the morphological transformation. Finally, the ability of pRb to maintain cell cycle arrest and induce senescence is reversibly abrogated by ablation of p27KIP1 expression. These findings suggest that prolonged cell cycle arrest through the persistent and specific inhibition of cdk2 activity by p27KIP1 is critical for pRb-induced senescence.

* Corresponding author. Mailing address: Department of Pathology, Harvard Medical School, 200 Longwood Ave., Boston, MA 02115. Phone: (617) 432-2901. Fax: (617) 432-0136. E-mail: phil_hinds{at}hms.harvard.edu.

Molecular and Cellular Biology, June 2001, p. 3616-3631, Vol. 21, No. 11
0270-7306/01/$04.00+0   DOI: 10.1128/MCB.21.11.3616-3631.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


This article has been cited by other articles:



Home Help [Feedback] [For Subscribers] [Archive] [Search] [Contents]
J. Bacteriol. J. Virol. Eukaryot. Cell
Microbiol. Mol. Biol. Rev. Clin. Vaccine Immunol. All ASM Journals

Copyright © 2001 by the American Society for Microbiology. All rights reserved.