Biological and Pharmaceutical Bulletin
Online ISSN : 1347-5215
Print ISSN : 0918-6158
ISSN-L : 0918-6158
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Human Cytosolic Sulfotransferase SULT1A3 Mediates the Sulfation of Dextrorphan
Akihiro YamamotoKatsuhisa KurogiIsaac Thomas SchieferMing-Yih LiuYoichi SakakibaraMasahito SuikoMing-Cheh Liu
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2016 Volume 39 Issue 9 Pages 1432-1436

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Abstract

Dextrorphan, an active metabolite of the antitussive dextromethorphan, has been shown to be subjected to sulfation by several zebrafish cytosolic sulfotransferases (SULTs). We were interested in finding out which of the human SULT(s) is(are) capable of catalyzing the sulfation of dextrorphan, and to verify whether sulfation of dextrorphan may occur in cultured human cells and human organ cytosols. Data from the enzymatic assays showed that, of all thirteen known human SULTs, SULT1A3 displayed the strongest dextrorphan-sulfating activity. Cell culture experiments using HepG2 human hepatoma cells and Caco-2 human colon carcinoma cells incubated with [35S]sulfate together with varying concentrations of dextrorphan revealed indeed the production and release of [35S]sulfated dextrorphan in a concentration-dependent manner. Additionally, significant dextrorphan-sulfating activity was detected in human liver, small intestine and lung cytosols. Taken together, these results provided a biochemical basis for the sulfation of dextrorphan in humans.

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© 2016 The Pharmaceutical Society of Japan
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