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- W2069865087 abstract "To study the effects of polyphenols on the Na+/glucose cotransporter (SGLT1) response, SGLT1 was expressed in Xenopus oocytes by injecting cRNA synthesized from the cloned cDNA of the small intestine cotransporter of rats, and the electrical response elicited by glucose or galactose was measured by a voltage clamping method. Most phenol derivatives had no effect on the response. However, the polyphenols (+)-catechin, (−)-epicatechin gallate (ECg), and (−)-epigallocatechin gallate (EGCg), which are components of green tea, caused an inhibition of the response, which was almost independent of glucose concentration. The inhibition constants were estimated to be 2.3 mM for (+)-catechin and 0.45 mM for both ECg and EGCg, assuming the noncompetitive inhibition mechanism. Saponin prepared from tea seeds also inhibited the response significantly. Tannic acid and aqueous extracts of teas induced nonspecific electrical responses in both cRNA-injected and noninjected oocytes at lower concentrations than those that caused an inhibition of the SGLT1 response when their dose-dependent effects were examined. These results are possibly helpful in the development of a dietary supplement for diabetic patients. Keywords: Catechin; Na+/glucose cotransporter; noncompetitive inhibition; polyphenol; Xenopus oocyte" @default.
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- W2069865087 date "2002-08-01" @default.
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- W2069865087 title "Polyphenol-Induced Inhibition of the Response of Na<sup>+</sup>/Glucose Cotransporter Expressed in <i>Xenopus</i> Oocytes" @default.
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- W2069865087 doi "https://doi.org/10.1021/jf020252e" @default.
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