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J. Biol. Chem., Vol. 259, Issue 8, 4840-4845, Apr, 1984
J Schneider, MM Huh, HL Bradlow and J Fishman
The estrogen responsive human breast cancer MCF-7 cell culture was examined for its response to 2-hydroxyestrone a principal metabolite of estradiol. Addition of 2-hydroxyestrone to the cell cultures in concentration of 10(-9) - 10(-6) M had no effect on cell growth and proliferation because of rapid O-methylation of the catechol estrogen by catechol O-methyltransferase which is highly active in these cells. In the presence of quinalizarin, a potent catechol O-methyltransferase inhibitor which reduces the O-methylation of the steroid, 10(-7) M and 10(-8) M 2-hydroxyestrone markedly suppresses the growth and proliferation of the cells. The tumor cell growth-inhibitory action of the catechol estrogen was neutralized by the presence of 10(-9) M estradiol. The catechol estrogen inhibition of cell growth is not observed in the estrogen receptor-negative human breast cancer cell lines MDA-MB-231 and MDA-MB-330 providing evidence that the inhibition is specific and is estrogen receptor-mediated. In contrast, the 16 alpha-hydroxylated metabolites of estradiol, estriol and 16 alpha- hydroxyestrone, are effective stimulators of MCF-7 cell proliferation with the latter exhibiting potency in excess of that expected from its estrogen receptor affinity. The present results represent the first observation of a specific receptor-mediated antiestrogenic action of 2- hydroxyestrone and suggest that the physiological regulation of the agonist activity of the primary estrogen may involve in situ generation of catechol estrogen.
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