Catecholestrogen sulfation: possible role in carcinogenesis

Biochemical and Biophysical Research Communications
Araba A Adjei, R M Weinshilboum

Abstract

A growing body of evidence supports the hypothesis that estrogens can be carcinogens as a result of their conversion to genotoxins after biotransformation to form the catecholestrogens (CEs) 2-hydroxyestrone (2-OHE1), 2-hydroxyestradiol (2-OHE2), 4-hydroxyestrone (4-OHE1) and 4-hydroxyestradiol (4-OHE2). CEs can then undergo further metabolism to form quinones that interact with DNA to form either stable or depurinating adducts. These events could potentially be interrupted by the sulfate conjugation of both the parent estrogens and/or the CEs. We set out to determine whether CEs can serve as substrates for sulfate conjugation, and-if so-which of the growing family of human sulfotransferase (SULT) isoforms are capable of catalyzing those reactions. We determined apparent K(m) values for 10 recombinant human SULT isoforms, as well as the three most common allozymes for SULT1A1 and SULT1A2, with 2-OHE1, 2-OHE2, 4-OHE1, and 4-OHE2, and with the endogenous estrogens, estrone (E1) and 17beta-estradiol (E2), as substrates. With the exception of SULT1B1, SULT1C1, and SULT4A1, all of the human SULTs studied catalyzed the sulfate conjugation of CEs. SULT1E1 had the lowest apparent K(m) values, 0.31, 0.18, 0.27, and 0.22 microM for 4-OHE...Continue Reading

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