Biol Reprod Keystone Symposia Conference on Frontiers in Reproductive Biology & Regulation of Fertility.
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Biology of Reproduction, Vol 29, 295-300, Copyright © 1983 by Society for the Study of Reproduction

ARTICLES

Effects of intraluminal administration of adrenoceptor agonists on transisthmic flow in the rabbit oviduct

C Strom, A Dahlstrom, B Lindblom and H Ahlman

By perfusing the isthmic segment of the rabbit oviduct in vivo at low hydrostatic pressures with Ringer's solution (+38 degrees C), the resistance of the isthmic segment could be measured quantitatively using a drop-recording system. Transisthmic flow, from mid-tube to the uterine end, was thus studied in 45 animals, 48 h after human chorionic gonadotropin (hCG) injection. Stimulation of alpha-adrenoceptors by administration of norepinephrine or phenylephrine to the perfusate resulted in an immediate reduction or cessation of the basal flow. The duration of this effect varied dose-dependently. The administration of beta-adrenoceptor agonists (isoprenaline, prenalterol or terbutaline) markedly increased transisthmic flow. The beta 2-adrenoceptor agonist terbutaline was considerably more potent than the other beta-agonists. Thus, it seems that the isthmic contraction caused by adrenergic luminal stimulation is mediated via alpha-adrenoceptors, while the isthmic dilation is mediated via beta-adrenoceptors, mainly of the beta 2-type.


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S. Papaioannou
A hypothesis for the pathogenesis and natural history of proximal tubal blockage
Hum. Reprod., March 1, 2004; 19(3): 481 - 485.
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Copyright © 1983 by the Society for the Study of Reproduction.