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Cations inhibit specifically type I 5 alpha-reductase found in human skin.
Author
Sugimoto Y; Lopez-Solache I; Labrie F; Luu-The V
Address
Medical Research Council Group in Molecular Endocrinology, CHUL Research Center, Quebec,
Canada.
Source:
J Invest Dermatol, 104: 5, 1995 May, 775-8
Abstract
Steroid 5 alpha-reductase catalyzes the reduction of testosterone into the very potent
androgen dihydrotestosterone. Previously, we showed that human type I 5 alpha-reductase is
expressed mainly in the skin, whereas a type II 5 alpha-reductase is more specifically
expressed in the prostate. To assess the possible differential effects of various cations
on the two types of 5 alpha-reductase, we constructed expression vectors and transfected
them into SW-13 cells, a human adrenal carcinoma cell line containing negligible
endogenous 5 alpha-reductase activity. The expressed 5 alpha-reductases were analyzed for
their sensitivity to Li, Ca, Cd, Cu, Mg, Mn, Ni, Zn, and Fe. The results showed that type
I 5 alpha-reductase was strongly inhibited by Cd, Cu, and Zn and moderately inhibited by
Ni and Fe, with 50% inhibitory concentration values of 0.9, 1.9, 2.0, 169.2, and 174.3
microM, respectively. In contrast, type II 5 alpha-reductase activity was inhibited only
by Cu, with a 50% inhibitory concentration value of 19.2 microM. The data showed that
cations could specifically control 5 alpha-reductase activity expression, which is more
strongly inhibited in a target tissue, especially the skin.
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