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Journal of Clinical Endocrinology & Metabolism, Vol 47, 1378-1382, Copyright © 1978 by Endocrine Society

ARTICLES

Specific 5 alpha-dihydrotestosterone receptors in human gingiva

AL Southren, SC Rappaport, GG Gordon and J Vittek

The cytoplasm of normal human male and female gingiva contains a receptor capable of specifically binding 5 alpha-dihydrotestosterone (DHT). This binding has a high affinity for DHT (Kd, approximately 2.2 x 10-9 M) and a low capacity (approximately 190 fmol/mg protein). The binding is extremely heat sensitive and exhibits a pattern of competition similar to that obtained with DHT receptors from other target tissues. The demonstration of a specific DHT receptor in human gingiva provides the first direct biochemical evidence that this tissue may function as a target organ for androgens. There was no correlation between the Kd in normal tissue and gingival hyperplasia or between the Kd or number of binding sites and the age or sex of the patient. However, there sites and the age or sex of the patient. However, there was a significant difference (P less than 0.0005) between the amount of DHT-binding sites per mg protein in normal tissue as compared to gingival hyperplasia (drugs or pregnancy).


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