Biol Reprod Keystone Symposia Conference on Frontiers in Reproductive Biology & Regulation of Fertility.
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Biology of Reproduction, Vol 6, 40-45, Copyright © 1972 by Society for the Study of Reproduction

Phenylethanolamine-N-Methyl Transferase Activity and its Regulation in Reproductive Tract of the Male Rat

ELENA A. BERNARD 1, and G. F. WASSERMANN 1

1 Instituto de Biología y Medicina Experimental, Obligado 2490, Buenos Aires, Argentina


Phenylethanolamine-N-methyl transferase (PNMT) activity has been found in cauda epididymides of mature rats.

The specific and total enzymatic activity of the region was significantly increased during sexual maturation of the animals (36 days: 3.38 ± 1.13; 44 days: 9.60 ± 1.12; 90 days: 53.77 ± 3.48 pmoles/mg protein/30 min), and by HCG administration to immature rats (44 days: 14.36 ± 1.31 pmoles/mg protein/30 min).

In adults, hypophysectomy diminished the total PNMT activity of the cauda epididymidis.

Very little activity was found in the other regions of the epididymides or in the testes. The presence of PNMT activity in cauda epididymidis, its increase during maturation, and the augmented activity produced through HCG administration suggests a significant role for this enzyme in the physiological processes of this particular region of the epididymis.

 Submitted on January 20, 1971






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Copyright © 1972 by the Society for the Study of Reproduction.