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Biological Action of Estrogen on the Epididymis of Prepubertal Rhesus Monkey *

Summary:  An estrogen binding protein has been demonstrated in the cytosol of the epididymis and caudal lobe of prostate of immature rhesus monkey. Scatchard plot analyses were linear, suggesting a single class of high affinity binding sites for the synthetic estrogen, R‐2858 (Moxestrol) with a Kd of 5.88 times 10‐10 mol/l and a concentration of binding sites of 17.0 ± 4.4 fmol/mg cytosol protein in the epididymis. In the prostate, the concentration of binding sites was 19.7 ± 3.6 fmol/mg cytosol protein with a Kd of 5.42 times 10‐10 mol/l. In immature castrated monkeys, administration of estradiol dipropionate caused a significant increase in the weight, total protein and sialic acid content of the epididymis. This biological action of estrogen on the epididymis is presumably mediated via estrogen receptor.