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Biology of Reproduction, Vol 24, 245-248, Copyright © 1981 by Society for the Study of Reproduction
-Adrenergic Receptors
During the Estrous Cycle of the Rat
1 Division of Drug Biology, Pharmaceutical Research and Testing,
Food and Drug Administration,
Washington, D.C. 20204 Scatchard plot analyses of [3H]-dihydroalprenolol binding to rat ovarian membranes revealed
that the rat ovary contains a single class of specific, high affinity
-adrenergic receptors which vary
significantly during the estrous cycle. Receptor concentrations are highest during proestrus, fall to
50% of proestrus levels in the morning of estrus (P<0.001), then increase to near proestrus levels
during metestrus and diestrus. There is no change in receptor affinity during the estrous cycle (KD
= 2.2 ± 0.1 x 10-9 M). These results indicate that ovarian function may be influenced directly by
catecholamines of either a neural or adrenal origin.
Note:
ACKNOWLEDGMENTS
I would like to thank Sylvia Colson for her expert
technical assistance.
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