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Carcinogenesis, Vol. 23, No. 8, 1399-1404, August 2002
© 2002 Oxford University Press

CARCINOGENESIS

Sulforaphane and its glutathione conjugate but not sulforaphane nitrile induce UDP-glucuronosyl transferase (UGT1A1) and glutathione transferase (GSTA1) in cultured cells

Graham P. Basten, Yongping Bao and Gary Williamson,1

Institute of Food Research, Norwich Research Park, Conley Lane, Norwich, NR4 7UA, UK

Glucoraphanin in Brassica vegetables breaks down to either sulforaphane or sulforaphane nitrile depending on the conditions, and sulforaphane can be further conjugated with glutathione. Using a high-throughput microtitre plate assay and TaqMan real time quantitative RT-PCR to measure mRNA, we show that sulforaphane and its glutathione conjugate, but not the nitrile, increased significantly (P < 0.05) both UGT1A1 and GSTA1 mRNA levels in HepG2 and HT29 cells. These changes were accompanied by an increase in UGT1A1 protein, as assessed by immunoblotting, and a 2–8-fold increase in bilirubin glucuronidation. When treated together, the nitrile derivative did not affect sulforaphane induction. The induction of UGT1A1 and GSTA1 mRNA by sulforaphane was time and concentration dependent. The results show a functional induction of glucuronidation by sulforaphane but not sulforaphane nitrile, and show that the pathway of metabolism of glucosinolates in Brassica vegetables is important in determining the resulting biological and anticarcinogenic activities.


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