Biol Reprod Keystone Symposia Conference on Frontiers in Reproductive Biology & Regulation of Fertility.
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Biology of Reproduction, Vol 21, 1239-1245, Copyright © 1979 by Society for the Study of Reproduction

Blockade of Episodic Secretion of Luteinizing Hormone in the Ram by the Administration of Antibodies to Luteinizing Hormone Releasing Hormone

G. A. LINCOLN 1, and H. M. FRASER 1

1 Medical Research Council Reproductive Biology Unit, Centre for Reproductive Biology, Edinburgh, EH3 9EW, Scotland


Administration of ovine serum containing LHRH antibodies to adult Soay rams during the autumn period of sexual activity resulted in an immediate blockade of episodic secretion of LH. The concentration of LH in the peripheral blood remained low for at least a day, but was increased 24 days later when episodic peaks of high frequency were again apparent. The plasma concentration of testosterone changed in close parallel with the changes in LH while the levels of FSH were unaffected and there were no clear effects on the size of the testes. The release of LH and testosterone following the i.v. injection of 200 ng synthetic LHRH was blocked on the day following the administration of the antiserum but the response returned to normal within 46 days by which time the antibodies to LHRH were virtually undetectable in the blood plasma.

These results show that the episodic secretion of LH in the ram is dependent on LHRH from the hypothalamus and that neutralization of the neurohormone results in a rapid decline in the circulating levels of LH. FSH on the other hand is largely unresponsive to changes in LHRH and secretion of FSH may occur for several days even after the complete neutralization of LHRH.

Note:
ACKNOWLEDGMENTS The animals used in this study were housed at the field station of the Animal Breeding Research Organisation at Dryden near Edinburgh and were cared for by Norah Anderson. The hormone assays were performed by Diane Blakeley, Sharon Kilpatrick and Rhona Cunningham and their skilled technical help is gratefully acknowledged. We thank NIAMDD for the gift of hormone preparations.

Submitted on April 23, 1979
Accepted on September 21, 1979




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Copyright © 1979 by the Society for the Study of Reproduction.