...
首页> 外文期刊>Cell biology international. >REGULATION OF ION TRANSPORT BY P-2U PURINOCEPTORS AND ALPHA(2)A ADRENOCEPTORS IN HT29 CELLS
【24h】

REGULATION OF ION TRANSPORT BY P-2U PURINOCEPTORS AND ALPHA(2)A ADRENOCEPTORS IN HT29 CELLS

机译:HT29细胞中P-2U受体和α(2)A肾上腺素受体对离子迁移的调控

获取原文
获取原文并翻译 | 示例
           

摘要

X-ray microanalysis was applied to investigate ion transport mediated by P-2U purinoceptors and alpha(2)A adrenoceptors as well as their interaction in the regulation of the intracellular elemental concentration in HT29 cells. In response to ATP, HT29 cells showed a decrease of intracellular Cl, Na and an increase in Ca. A similar result was observed with UTP, but UTP appeared to be more potent than ATP. On the other hand, UK14,304, an alpha(2) receptor agonist, was found to be capable of reversing the action of both UTP and ATP on ion secretion, and caused a clear increase in intracellular Na and Cl. Moreover, treatment of cells with UK14,304 before exposure to UTP did not induce a decrease in C1 and Na, suggesting that UK14,304 blocks the action of UTP. The secretory effect of UTP was also blocked by NPPB, a chloride channel blocker, and alloxan. Chelation of extracellular Ca with EGTA abolished ion response to UTP. These results suggest that since inhibition of the intracellular cAMP system and chelation of Ca2+ can block the nucleotide-induced chloride secretion, the ATP and UTP-induced chloride secretion can be mediated via both cAMP-dependent and Ca2+-dependent pathways. (C) 1997 Academic Press Limited. [References: 33]
机译:X射线显微分析用于研究由P-2U嘌呤受体和α(2)A肾上腺素受体介导的离子运输及其在HT29细胞中细胞内元素浓度调节中的相互作用。响应ATP,HT29细胞显示细胞内Cl,Na减少和Ca增加。使用UTP观察到类似的结果,但是UTP似乎比ATP更有效。另一方面,发现UK14304是一种alpha(2)受体激动剂,能够逆转UTP和ATP对离子分泌的作用,并引起细胞内Na和Cl的明显增加。此外,在暴露于UTP之前用UK14,304处理细胞不会诱导C1和Na的减少,这表明UK14,304会阻止UTP的作用。 UTP的分泌作用也被NPPB,氯离子通道阻滞剂和四氧嘧啶阻断。 EGTA与细胞外钙的螯合消除了对UTP的离子反应。这些结果表明,由于细胞内cAMP系统的抑制和Ca2 +的螯合可以阻断核苷酸诱导的氯的分泌,因此ATP和UTP诱导的氯的分泌可以通过cAMP依赖性和Ca2 +依赖性途径介导。 (C)1997 Academic Press Limited。 [参考:33]

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号