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Erythrocyte sodium/hydrogen exchange inhibition by (-) epicatechin.

机译:(-)表儿茶素对红细胞钠/氢交换的抑制作用。

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Epicatechin, a flavonoid belonging to the group of compounds collectively called catechins, have been reported to possess insulin-like properties. Besides their anti-diabetic properties, catechins also show growth inhibition. Since cytosolic pH (pHi) plays a role in cell proliferation and the Na/H exchanger (NHE) is the major pH (pHi) regulatory mechanism, we undertook in vitro studies with human erythrocytes to examine the effect of (-) epicatechin (EC) on the NHE1 isoform. NHE activity was measured in eight healthy volunteers, eight type 1 diabetics, and nine type 2 diabetics, following 30 min incubations at 37 degrees C with either 1 mM epicatechin, 10(-9) M insulin or solvent alone. NHE activity was elevated in both groups of patients (P< 0.05). Epicatechin caused a 93% decrease in Na/H antiport activity in health controls, 89 and 86% in type 1 and type 2 diabetics, respectively (P< 0.001). Insulin caused a 36% decrease in antiport activity only in the type 2 diabetic group (P< 0.05). The strong inhibition of erythrocyte NHE1 (the ubiquitously present isoform) by epicatechin may have important implications. NHE1 inhibition could be one of the major mechanisms underlying the antiproliferative effects of catechins. Copyright 2001 Academic Press.
机译:据报道,表儿茶素是一种类黄酮,属于总称为儿茶素的一组化合物,具有类胰岛素的特性。儿茶素除具有抗糖尿病特性外,还显示出生长抑制作用。由于胞质pH(pHi)在细胞增殖中发挥作用,而Na / H交换剂(NHE)是主要的pH(pHi)调节机制,因此我们进行了人红细胞的体外研究,以研究(-)表儿茶素(EC)的作用。 )在NHE1亚型上。在37°C与1 mM表儿茶素,10(-9)M胰岛素或溶剂单独孵育30分钟后,在8位健康志愿者,8位1型糖尿病患者和9位2型糖尿病患者中测量了NHE活性。两组患者的NHE活性均升高(P <0.05)。表儿茶素在健康对照组中导致Na / H反向转运活性降低93%,在1型和2型糖尿病患者中分别降低89%和86%(P <0.001)。胰岛素仅在2型糖尿病组中引起36%的抗端口活性降低(P <0.05)。表儿茶素对红细胞NHE1(普遍存在的同种型)的强抑制作用可能具有重要意义。 NHE1抑制可能是儿茶素抗增殖作用的主要机制之一。版权所有2001,学术出版社。

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