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Endocrinology, Vol 97, 1316-1320, Copyright © 1975 by Endocrine Society

ARTICLES

Sex hormones and tyrosine hydroxylase activity in vascular and adrenal tissue

C Kohler, BA Berkowitz and S Spector

Vascular tyrosine hydroxylase (TH) activity did not appear to be affected by the sex hormones. There were no differences in enzyme activity in the mesenteric artery or vein taken from male and female normotensive or spontaneously hypertensive rats. Castration of either male or female rats did not alter mesenteric artery or vein TH activity, and the administration of estradiol, progesterone, or testosterone also had no effect on vascular TH activity. However, the sex hormones did alter activity in other tissues. Estradiol and progesterone administration to intact female rats increased adrenal TH activity, whereas castration of the male rat decreased it. Although the sex hormones were not important regulators of TH in blood vessels, vascular TH activity did appear to be under some hormonal regulation since hypophysectomy decreased mesenteric artery enzyme activity. Hypophysectomy studies also indicated that adrenal TH activity was under some hormonal regulation.


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