Stereospecific effects of catechin isomers on insulin induced lipogenesis in 3T3‐L1 cells

We studied the inuence of (+)‐ and (−)‐catechin contained in green tea on insulin induced lipogenesis in 3T3‐L1 cells. In 14 days of culture with insulin, the intracellular triglyceride concentration and the activities of glycerophosphate dehydrogenase, a marker of adipose conversion, increased. The addition of 0.02 mg/ml (+)‐isomer stimulated the accumulation of triglyceride induced by insulin, but the addition of the same concentration of (−)‐isomer inhibited lipogenesis. The activities of glycerophosphate dehydrogenase were changed by (+)‐ and (−)‐catechin in the same direction as the corresponding changes in triglyceride accumulation. These data suggest a biological signicance of catechins, with opposite effects on lipid metabolism depending on the isomer. Copyright © 2004 John Wiley & Sons, Ltd.