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Caffeine overrides the S-phase cell cycle block in sea urchin embryos

Published online by Cambridge University Press:  26 September 2008

Rajnikant Patel ,
Elizabeth M. Wright  and
Michael Whitaker
Rajnikant Patel
Affiliation:
Department of Biochemistry, University of Leicester, University Road, Leicester LE1 7RH, UK.
Elizabeth M. Wright
Affiliation:
Department of Physiological Scences, Medical School, Framlington Place, Newcastle upon Tyne NE2 4HH, UK
Michael Whitaker*
Affiliation:
Department of Physiological Scences, Medical School, Framlington Place, Newcastle upon Tyne NE2 4HH, UK
*
Michael Whitaker, Department of Physiological Sciences, Medical School, Framlington Place, Newcastle upon Tyne NE2 4HH, UK. Telephone: +44 (0)191 222 5475. Fax: +44 (0)191 222 6706.
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Summary

During the early mitotic cell cycles of the sea urchin embryo, the cell oscillates between S-phase and M-phase. In the presence of aphidicolin, a DNA synthesis inhibitor, a checkpoint control blocks the activation of the p34cdc2 protein kinase, by keeping it in the inactive, tyrosine phosphorylated form, and the embryos do not enter mitosis. Caffeine has been shown to bypass the G2/M-phase checkpoint in mammalian cells and in cycling Xenopus extracts and to induce mitosis despite the presence of damaged or unreplicated DNA. In this study we show that caffeine also induces mitosis and cell division in sea urchin embryos, in the presence of unreplicated DNA, by stimulating the tyrosine dephosphorylation of p34cdc2 and switching on its protein kinase activity. We also show that the caffeine-induced activation of the p34cdc2 protein kinase is not mediated by either of the two second messengers, calcium and cAMP, or by inhibition of the p34cdc2 tyrosine kinase. Thus, none of the mechanisms proposed for caffeine's action can explain how it overrides the S-phase checkpoint in the early cell cycles of the sea urchin embryo.

Keywords

AphidicolinCaffeineCell cyclep34cdc2Sea urchin
Type
Article
Information
Zygote , Volume 5 , Issue 2 , May 1997 , pp. 127 - 138
Copyright
Copyright © Cambridge University Press 1997

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