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Biology of Reproduction, Vol 10, 346-353, Copyright © 1974 by Society for the Study of Reproduction

The Effect of Ovulation on the Response of the Rabbit Oviduct to Adrenergic Agonists in Vitro

BARRIE J. HODGSON 1, and CARL J. PAUERSTEIN 1

1 Department of Obstetrics and Gynecology, The University of Texas Medical School at San Antonio, 7703 Floyd Curl Drive, San Antonio, Texas 78284


Rabbit oviductal segments in vitro are less sensitive to phenylephrine 72 hr after injection of human chorionic gonadotropin compared to estrogen-dominated tissues. The shift in the concentration—response curve and also an apparent difference in the affinity of phentolamine for alpha-adrenergic receptors is negated by propranolol. Comparison of concentration—response curves of inhibition of standard contractions by isoproterenol and papaverine confirms that ovulation specifically elicits an elevation of the inhibitory activity of beta-adrenergic receptors of the oviduct. Longitudinal preparations of the oviduct demonstrate a significantly greater sensitivity to phenylephrine than circular preparations. These data suggest that ovum passage through the oviductal isthmus is controlled by hormonally induced changes in the adrenergic receptor population.

Accepted on August 7, 1973






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Copyright © 1974 by the Society for the Study of Reproduction.