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Cell Growth & Differentiation, Vol 7, Issue 7 893-901, Copyright © 1996 by American Association of Cancer Research


ARTICLES

p21WAF1/CIP1/SDI1 is elevated through a p53-independent pathway by mimosine

RS Alpan and AB Pardee
Division of Cell Growth and Regulation, Dana-Farber Cancer Institute, Boston, Massachusetts 02115, USA.

Tumor suppressor p53 is a nuclear protein that is induced by DNA damage and is involved in G1 and G2 phase control of the cell cycle. p21WAF1/CIP1/SDI1 (p21), a cyclin-dependent kinase inhibitor, is a downstream target and effector of p53 to induce G1 arrest. Mimosine is a potent reversible late G1 phase blocker of the cell cycle. In this study, we showed that mimosine can increase both p21 mRNA and protein levels, indirectly inhibit cyclin E-associated kinase activity without affecting the cyclin E protein level, block human breast cancer cells (21PT) in the late G1 phase of the cell cycle, and induce a p53-independent p21 pathway in these cells. These results support the possibility of restoring a G1 checkpoint by use of mimosine. They also suggest that the mechanism of the effect of mimosine is complex and may have more than one target in the cell.


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HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Cancer Research Clinical Cancer Research
Cancer Epidemiology Biomarkers & Prevention Molecular Cancer Therapeutics
Molecular Cancer Research Cell Growth & Differentiation
Copyright © 1996 by the American Association of Cancer Research.