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Am J Physiol Endocrinol Metab 277: E870-E875, 1999;
0193-1849/99 $5.00
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Vol. 277, Issue 5, E870-E875, November 1999

A selective increase in circulating inhibin and inhibin pro-alpha C at the time of ovulation in the mare

Kentaro Nagaoka1, Yasuo Nambo2, Natsuko Nagamine1,4, Shun-Ichi Nagata3, Yumiko Tanaka1, Hiromi Shinbo1, Nobuo Tsunoda4, Hiroyuki Taniyama5, Gen Watanabe1, Nigel P. Groome6, and Kazuyoshi Taya1

1 Laboratory of Veterinary Physiology, Tokyo University of Agriculture and Technology, Tokyo 183-8509; 2 Equine Research Institute, Japan Racing Association, Tochigi 320-0856; 3 Laboratory of Racing Chemistry, Tochigi 320-0851; 4 Shadai Corporation, Hokkaido 059-1432; and 5 Rakuno Gakuen University, Hokkaido 069-0836, Japan; and 6 School of Biological and Molecular Sciences, Oxford Brookes University, Headington Oxford OX3 0BP, UK

The relationship between a selective increase in circulating immunoreactive (ir)-inhibin and the time of ovulation was investigated in mares. Concentrations of plasma ir-inhibin were measured every 4 h during the periovulatory period. Inhibin pro-alpha C, a precursor protein of the inhibin alpha -subunit, was also measured. The changes in ir-inhibin and inhibin pro-alpha C in circulation were parallel. Concentrations of both ir-inhibin and inhibin pro-alpha C in the plasma increased at the same time when ovulatory follicles ruptured, and the peak levels of circulating ir-inhibin and inhibin pro-alpha C were maintained for 4-8 h. There was no selective increase in plasma concentrations of estradiol-17beta during the process of ovulation. These results suggest that the selective increase in ir-inhibin and inhibin pro-alpha C was caused by the absorption of follicular fluid after the rupture of ovulatory follicles. These results also suggest that the measuring of plasma concentrations of ir-inhibin or inhibin pro-alpha C in mares might be a useful method for detecting the time of ovulation.

luteinizing hormone; follicle-stimulating hormone; progesterone; marker of ovulation


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F.X. Donadeu and O.J. Ginther
Changes in Concentrations of Follicular Fluid Factors During Follicle Selection in Mares
Biol Reprod, April 1, 2002; 66(4): 1111 - 1118.
[Abstract] [Full Text] [PDF]


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