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BOR - Papers in Press, published online ahead of print November 9, 2005.
Biol Reprod 2005, 10.1095/biolreprod.105.046524
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BIOLOGY OF REPRODUCTION 74, 585–592 (2006)
DOI: 10.1095/biolreprod.105.046524
© 2006 by the Society for the Study of Reproduction, Inc.

Research Article

Stress Stimulates AMP-Activated Protein Kinase and Meiotic Resumption in Mouse Oocytes

Cean LaRosa , and Stephen M. Downs 1 

Biology Department, Marquette University, Milwaukee, Wisconsin 53233

ABSTRACT

This study examined the effects of three different cellular stresses on oocyte maturation in meiotically arrested mouse oocytes. Cumulus-cell enclosed oocytes (CEO) or denuded oocytes (DO) from immature, eCG-primed mice were cultured for 17–18 h in dbcAMP-containing medium plus increasing concentrations of the metabolic poison, sodium arsenite, or the free radical-generating agent, menadione. Alternatively, oocytes were exposed to osmotic stress by pulsing with sorbitol and returned to control inhibitory conditions for the duration of culture. Arsenite and menadione each dose-dependently induced germinal vesicle breakdown (GVB) in both DO and CEO. DO, but not CEO, pulsed for 60 min with 500 mM sorbitol were stimulated to resume maturation. The lack of effect in CEO suggests that the cumulus cells may be playing a protective role in osmotic stress-induced GVB. The AMP-activated protein kinase (PRKA; formerly known as AMPK) inhibitors, compound C and araA, completely blocked the meiosis-stimulating effects of all the tested stresses. Western blots showed that acetyl-CoA carboxylase, an important substrate of PRKA, was phosphorylated before GVB, supporting a role for PRKA in stress-induced maturation. Together, these data show that a variety of stresses stimulate GVB in meiotically arrested mouse oocytes in vitro and suggest that this effect is mediated through activation of PRKA.

gamete biology, meiosis, oocyte development

FOOTNOTES

1 Correspondence. FAX: 414 288 7357; Stephen.Downs{at}marquette.edu




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