Abstract
Soluble and insoluble fractions in a hypotonic buffer solution of hypothalamic-preoptic and median eminence areas, and of the anterior pituitary of the hen were found to contain a specific androgen binding component having the properties of a receptor. Administration of testosterone in vivo caused a marked decrease in specific [3H]R1881 (a synthetic androgen) bindings in the soluble fraction with a concomitant increase in the bindings in the insoluble fraction, whereas the sum of the bindings did not change. A similar relationship between the bindings of the two fractions was also observed during an ovulatory cycle. The results may provide an evidence for a direct action of androgens on the hen hypothalamus and pituitary.
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