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BOR - Papers in Press, published online ahead of print December 26, 2003.
Biol Reprod 2003, 10.1095/biolreprod.103.023705
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Submitted September 29, 2003
Returned for revision October 10, 2003
Accepted November 25, 2003

Testis


Key Role for Cyclin-Dependent Kinases in the First and Second Meiotic Divisions of Rat Spermatocytes

Murielle Godet *, Anne Damestoy , Sandrine Mouradian , Brian B. Rudkin , and Philippe Durand

* To whom correspondence should be addressed. E-mail: godet{at}lyon.inserm.fr.

Abstract
In all systems examined so far, the G2/M transition is controlled by M-phase promoting factor (MPF), a complex of cdc2 (CDK1) and cyclin B1. Histone H1 kinase activity and MPF components are present in pachytene spermatocytes (PS). However, it has not been demonstrated yet that direct inhibition of MPF activity prevents the G2/M transition in these cells. When roscovitine, a potent inhibitor of CDK1, CDK2 and CDK5 activities, was added to co-cultures of PS with Sertoli cells, the number of both secondary spermatocytes and round spermatids formed were lower than in control cultures, despite similar cell viability. This effect of roscovitine was reversible, did not involve the Sertoli cells and was dependent on the concentration of the inhibitor. Roscovitine did not modify the amount of MPF in these germ cells but inhibited the CDK1- or CDK2-associated histone H1 kinase activity of PS. Hence, it is shown a functional relationship between cyclin-dependent kinase activity and the spontaneous processing of the first meiotic division, but also, for the first time, of the second meiotic division of male germ cells.

Key words: Testis • Gametogenesis • Kinases • Meiosis • Spermatogenesis


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