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首页> 外文期刊>Pfluegers Archiv: European Journal of Physiology >Inhibition of volume-stimulated taurine efflux and tyrosine kinase activity in the skate red blood cell.
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Inhibition of volume-stimulated taurine efflux and tyrosine kinase activity in the skate red blood cell.

机译:滑冰红细胞中体积刺激的牛磺酸外排和酪氨酸激酶活性的抑制。

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摘要

Phosphorylation of the band 3 anion exchange protein by the tyrosine kinases p72syk and p56lyn is thought to play a role in the pathway that regulates swelling-activated taurine efflux from the skate red blood cell. In this study, the protein tyrosine kinase (PTK) inhibitors piceatannol and tyrphostin A23 both inhibited taurine efflux and the activities of the tyrosine kinases p72syk and p56lyn in the skate erythrocyte. However, the PTK inhibitors genistein and tyrphostin A46 had only small effects on taurine efflux and PTK activities. In general, a strong correlation between the extent of inhibition of taurine efflux and of tyrosine kinase activity was observed. PTK inhibitors showed a similar pattern of inhibition of band 3 phosphorylation, with the greatest inhibition observed in cells treated with piceatannol. The protein kinase C inhibitors staurosporine and bisindolylmaleimide tested alone or in combination with piceatannol had little or no significant effect on swelling-activated taurine efflux. Overall the results support the hypothesis that phosphorylation of the skate band 3 protein by p72syk and p56lyn contributes to the regulation of volume-activated taurine efflux in skate red cells, and suggest that protein kinase C may not be involved in this regulation.
机译:酪氨酸激酶p72syk和p56lyn对band 3阴离子交换蛋白的磷酸化被认为在调节滑冰红细胞中溶胀激活的牛磺酸流出的途径中起作用。在这项研究中,蛋白质酪氨酸激酶(PTK)抑制剂piceatannol和tyrphostin A23都抑制牛磺酸流出以及滑冰红细胞中酪氨酸激酶p72syk和p56lyn的活性。但是,PTK抑制剂金雀异黄素和酪氨酸蛋白酶抑制剂A46对牛磺酸外排和PTK活性的影响很小。通常,观察到牛磺酸外排的抑制程度与酪氨酸激酶活性之间存在很强的相关性。 PTK抑制剂显示出类似的带3磷酸化抑制模式,在用皮卡汀醇处理的细胞中观察到最大的抑制作用。单独或与皮卡季诺醇联合测试的蛋白激酶C抑制剂staurosporine和bisindolylmaleimide对溶胀激活的牛磺酸外排几乎没有或没有显着影响。总体而言,该结果支持以下假设:p72syk和p56lyn对滑冰带3蛋白的磷酸化有助于调节滑冰红细胞中体积激活的牛磺酸外排,并暗示蛋白激酶C可能不参与该调节。

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