Sulfation of resveratrol in human liver: Evidence of a major role for the sulfotransferases SULT1A1 and SULT1E1

Abstract

Sulfation of resveratrol, a polyphenolic compound present in grapes and wine with anticancer and cardioprotective activities, was studied in human liver cytosol. In the presence of 3′-phosphoadenosine-5′-phosphosulfate, three metabolites (M1–3) whose structures were identified by mass spectrometry and NMR as trans-resveratrol-3-O-sulfate, trans-resveratrol-4′-O-sulfate, and trans-resveratrol-3-O-4′-O-disulfate, respectively. The kinetics of M1 formation in human liver cytosol exhibited an pattern of substrate inhibition with a K_i of 21.3 ± 8.73 µM and a V_max/K_m of 1.63 ± 0.41 µL min⁻¹mg⁻¹ protein. Formation of M2 and M3 showed sigmoidal kinetics with about 56-fold higher V_max/K_m values for M3 than for M2 (2.23 ± 0.14 and 0.04 ± 0.01 µL min⁻¹ mg⁻¹). Incubation in the presence of human recombinant sulfotransferases (SULTs) demonstrated that M1 is almost exclusively catalysed by SULT1A1 and only to a minor extent by SULT 1A2, 1A3 and 1E1, whereas M2 is selectively formed by SULT1A2. M3 is mainly catalysed by SULT1A2 and 1A3. In conclusion, the results elucidate the enzymatic pathways of resveratrol in human liver, which must be considered in humans following oral uptake of dietary resveratrol.

Kewords: :

• Resveratrol
• sulfation
• human liver
• SULT1A1
• SULT1E1

Acknowledgements

The study was supported by a grant from the Jubiläumsfonds are Österreichischen Nationalbank 9894 (W. J.) and by the Fonds zur Förderung der Wissenschftlichen Forschung des Bürgermeisters der Bundeshauptstadt Wien (2296; T. S.).