16?-<wbr/>hydroxy Estrone

16?-hydroxy Estrone

CAT N°: 15208
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The naturally-occurring estrogens are estrone (E1, Item No. 10006485), estradiol (E2, Item No. 10006315), and estriol (E3, Item No. 10006484).{9611} 16?-hydroxy Estrone (16?-OHE1) is a hydroxylated metabolite of E1 as well as an interconversion product with E2.{24474,24473} E1 is 16?-hydroxylated by cytochrome P450 (CYP) isoforms, including CYP1A1, CYP3A5, CYP3A4, and CYP3A7, with CYP3A5 being breast-specific.{24483} 16?-OHE1 is sulphatized or glucuronidated before excretion.{24483} It is increased in rheumatoid arthritis and decreased by physical activity.{24474,24473} Unlike the parent estrogens and other hydroxylated metabolites of E1, 16?-OHE1 binds covalently and persistently activates estrogen receptors.{24475} In addition, this metabolite increases cell proliferation and does not suppress TNF-? secretion, whereas other estrogen metabolites are not pro-proliferative and have marked effects on TNF-? secretion.{24474,24483} The levels of 16?-OHE1 are increased in some forms of hormone therapy.{24472} Because hormone therapy increases breast cancer risk, 16?-OHE1 has been implicated as a risk factor for breast cancer, although supportive data remains elusive.{24476,24483,24472}

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