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Presence of Estrogen Receptors in the Hen Hypothalamus and Pituitary

Department of Poultry and Animal Sciences, Gifu University Gifu 501-11, Japan

Address requests for reprints to: Dr. Katuhide Tanaka, Department of Poultry /Animal Sciences, Gifu University, 1-1 Yanagido, Gifu 501-11, Japan.

Abstract

In the hen, the preoptic area, medial basal hypothalamus, and anterior lobe of the pituitary showed a greater uptake of [³H]estradiol-17β (E₂) in uiuo than other tissues. This uptake was decreased when unlabeled diethylstilbestrol was injected together with the [³H]E₂ or when unlabeled E₂ was injected before the [³H]E₂ injection. A specific estrogen binding component having properties of a receptor was found in vitro in both soluble and insoluble fractions of these tissues in a hypotonic buffer solution. The administration of E₂ in vivo caused a marked decrease in the estrogen receptor binding in the soluble fraction with a concomitant increase in binding in the insoluble fraction; as a result, total binding (sum of the bindings in soluble and insoluble fraction) did not change. (Endocrinology 120: 582–588, 1987)

Received January 10, 1986.

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