Biol Reprod Keystone Symposia Conference on Frontiers in Reproductive Biology & Regulation of Fertility.
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Biology of Reproduction, Vol 32, 1211-1217, Copyright © 1985 by Society for the Study of Reproduction

ARTICLES

Alterations in mast cell degranulation and ovarian histamine in the proestrous hamster

A Krishna and PF Terranova

Mast cells in the ovary of cyclic hamsters were observed exclusively in the hilum and in the vicinity of blood vessels that enter and exit the ovary. Ovaries were collected on proestrus from hamsters at 0900 h preluteinizing hormone (LH) surge, 1500 h (peak LH surge), and 2100 h (post-LH surge) and processed for routine histologic staining with toluidine blue. A significant increase in the percentage of extensively degranulating mast cells was observed coincident with the gonadotropin surge (0900 h: 5.39 +/- 0.97%; 1500 h: 20.39 +/- 2.76%). At the peak of the LH surge the ovarian histamine concentration was also significantly higher than those before and after the surge (1500 h: 5.13 +/- 0.94 ng/mg ovary; 0900 h and 2100 h: 2.84 +/- 0.35 and 3.02 +/- 0.48 ng/mg, respectively). The results indicate that a major source of ovarian histamine may be mast cells residing in the ovarian hilum and surrounding the ovarian blood vessels that enter and exit the ovary. In addition, the gonadotropin surge on the day of proestrus may be a trigger for release of mast cell histamine.


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