Endocrinology, Vol 129, 1869-1875, Copyright © 1991 by Endocrine Society

ARTICLES

Preovulatory changes in ovarian expression of collagenases and tissue metalloproteinase inhibitor messenger ribonucleic acid: role of eicosanoids

R Reich, D Daphna-Iken, SY Chun, M Popliker, R Slager, BC Adelmann-Grill and A Tsafriri
Department of Pharmacology, Hebrew University, Jerusalem, Israel.

The preovulatory surge of gonadotropins activates a cascade of proteolytic enzymes resulting in the rupture of the follicular wall and the release of a fertilizable ovum during ovulation. In the rat the process is initiated by a rise in follicular tissue-type plasminogen activator, produced predominantly in granulosa cells. Recent studies revealed a preovulatory increase in ovarian collagenolytic activity in vivo and an increase in activatable collagenase in vitro. In view of the complicated control of mammalian collagenase synthesis and activity by local inhibitors and activators, we examined the expression of ovarian interstitial and type IV collagenases and tissue inhibitor of metalloproteinase (TIMP) mRNA after an ovulatory stimulus. Ovarian mRNA was isolated from immature PMSG-treated rats 3, 6, and 9 h after hCG stimulation. Northern blot analyses revealed a mRNA of 1.7 kilobases (kb) hybridizing with the human interstitial collagenase cDNA probe. The levels of this mRNA showed a 25-fold increase between 3-6 h after hCG stimulation. The human cDNA probe of collagenase IV hybridized with a mRNA of 3.1 kb, which showed only a 4-fold increase 9 h after hCG treatment. The interstitial collagenase mRNA was expressed in both granulosa cells of preovulatory follicles and the residual ovarian tissue, whereas the expression of collagenase IV mRNA was limited to the residual tissue. Inhibitors of eicosanoid synthesis, previously shown to block ovulation and the LH/hCG-induced rise in ovarian collagenolysis, suppressed the gonadotropic stimulation of interstitial collagenase mRNA, but slightly stimulated that of collagenase IV. The mouse cDNA probe of TIMP hybridized with a 0.9-kb mRNA, which was stimulated by hCG to reach a maximum (7- to 8-fold increase) between 6- 9 h after stimulation. TIMP was expressed and stimulated in both the granulosa cells and the residual tissue. Inhibitors of eicosanoid synthesis did not affect the gonadotropic stimulation of TIMP mRNA. These data support the suggested role of interstitial collagenase in follicle rupture and the essential role of eicosanoids in the mediation of gonadotropic stimulation of interstitial collagenase production and action. The observed stimulation of TIMP mRNA expression by the gonadotropin and the lack of any effect of eicosanoid synthesis inhibitors on this action of LH/hCG offer an additional mechanism by which these inhibitors may block ovulation. Thus, the suppression of ovulation by inhibitors of eicosanoid synthesis may result from selective inhibition of interstitial collagenase expression and undisturbed gonadotropin-stimulated TIMP expression.

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