Abstract
The preovulatory surge of LH promotes stimulation, closely followed by desensitization of the ovarian follicular adenylyl cyclase (AC) system (1–6). Desensitization of the AC system in estrous rabbit follicles is characterized by an LH-specific, dose-dependent decline in LH-stimulated AC activity and results, by definition, in a retarded rate of cAMP synthesis (2). Although a coincident decline in LH- and FSH-stimulated AC activities occurs, there is no concurrent decline in prostaglandin (PG)E1- or NaF- stimulated AC activities (2). LH refractoriness is demonstrable within min following mating of the iv injection of an ovulatory dose of hCG and is complete prior to ovulation. The follicular AC system does not acquire LH responsiveness again until 48–72 h after the induction of ovulation, when the new CL has formed. Desensitization of the AC system, then, is clearly one of the earliest events prompted by the surge of LH in follicles. However, little is known concerning the mechanism underlying the desensitizing process.
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Hunzicker-Dunn, M., Jungmann, R., Derda, D., Birnbaumer, L. (1979). LH-Induced Desensitization of the Adenylyl Cyclase System in Ovarian Follicles. In: Channing, C.P., Marsh, J.M., Sadler, W.A. (eds) Ovarian Follicular and Corpus Luteum Function. Advances in Experimental Medicine and Biology, vol 112. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-3474-3_3
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DOI: https://doi.org/10.1007/978-1-4684-3474-3_3
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