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Biology of Reproduction, Vol 22, 243-246, Copyright © 1980 by Society for the Study of Reproduction

Calcium Concentration in Cumulus Enclosed Oocytes of Rats after Treatment with Pregnant Mares Serum

SATISH K. BATTA 1, and J. F. KNUDSEN 1

1 Department of Physiology, University of Maryland, School of Medicine, Baltimore, Maryland 21201


Total calcium concentrations of cumulus enclosed oocytes in the rat were studied during PMSG-induced LH release. The concentration of total calcium in cumulus enclosed oocytes increased concomitantly with increased serum LH up to and including 53 h after PMSG treatment; thereafter calcium level decreased. These increments in calcium concentrations and serum LH levels occurred at a time of an increase in germinal vesicle breakdown.

The present data point to a relationship between the LH surge, calcium levels in oocytes and germinal vesicle breakdown in the rat.

Note:
ACKNOWLEDGMENTS The authors wish to thank the following individuals for their expert technical assistance: Ms. Melinda Musk, Donna Cucina, Margaret Kempf and Mr. Peter Littlefield. This study was partially supported by grant number NS 13420 awarded to F. J. Brinley, M.D., Ph.D.

Submitted on July 31, 1979
Accepted on October 30, 1979




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Copyright © 1980 by the Society for the Study of Reproduction.