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Meiotic Arrest in the Mouse Follicle Maintained by a Gs Protein in the Oocyte
Lisa M. Mehlmann,1*Teresa L. Z. Jones,2Laurinda A. Jaffe1
The mammalian ovarian follicle consists of a multilayered complex
of somatic cells that surround the oocyte. A signal fromthe follicle
cells keeps the oocyte cell cycle arrested at prophaseof meiosis I
until luteinizing hormone from the pituitary actson the follicle cells
to release the arrest, causing meiosis tocontinue. Here we show that
meiotic arrest can be released inmice by microinjecting the oocyte
within the follicle with anantibody that inhibits the stimulatory
heterotrimeric GTP-bindingprotein Gs. This indicates that
Gs activity in the oocyte is requiredto maintain meiotic
arrest within the ovarian follicle and suggeststhat the follicle may
keep the cell cycle arrested by activatingGs.
1 Department of Physiology, University of
Connecticut Health Center, Farmington, CT 06032, USA.
2 Metabolic Diseases Branch, National Institute of
Diabetes and Digestive and Kidney Diseases, National Institutes of
Health, Bethesda, MD 20892, USA.
*
To whom correspondence should be addressed. E-mail:
lmehlman{at}neuron.uchc.edu.
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