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Biochem Pharmacol. 1995 Aug 25;50(5):731-4.

Quercetin, a potent and specific inhibitor of the human P-form phenosulfotransferase.

Author information

1
Department of Cell and Molecular Pharmacology and Experimental Therapeutics, Medical University of South Carolina, Charleston 29425, USA.

Abstract

The natural product quercetin was a potent inhibitor of the human P-form phenolsulfo-transferase with an IC50 value of 0.10 +/- 0.03 microM (mean +/- SEM; N = 5), which was three to four orders of magnitude more potent than its inhibition of other human sulfotransferases. The inhibition was noncompetitive with a Ki value of 0.10 microM. The potency and mechanism of this inhibition appear similar to those of the current standard P-form inhibitor, 2,6-dichloro-4-nitrophenol. Among other flavonoids examined, kaempferol was found to have an IC50 value of 0.39 +/- 0.07 microM, naringenin 10.6 +/- 1.6 microM and naringin 265 +/- 90 microM (N = 3). These observations suggest the potential for clinically important pharmacologic and toxicologic interactions by flavonoid-containing foods and beverages.

PMID:
7669078
DOI:
10.1016/0006-2952(95)00190-b
[Indexed for MEDLINE]

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