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Ouabain-induced enhancement of rat mast cells response - Modulation by protein phosphorylation and intracellular pH

机译:哇巴因诱导的大鼠肥大细胞应答增强-蛋白磷酸化和细胞内pH调节

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The digitalic glicoside ouabain induces potentiation of rat mast cell histamine release in response to several stimuli. which is mediated bq Na+/Ca2+ exchanger. In this work. we studied the effect of ouabain on cytosolic calcium, intracellular pH and histamine release with Ca2+ ionophore A23 187 in conditions designed to maximize ouabain-induced potentiation of rat mast cells response. The effect of protein kinase C (PKC), cAMP and phosphatase inhibition was also tested. Ouabain induced an enhancement in histamine release, cytosolic calcium and intracellular pH. The adenylate cyclase activator forskolin reduced the effect of ouabain on histamine release and intracellular pH, but enhanced the effect on cytosolic calcium. PKC activator PMA enhanced the effect of ouabain on histamine release and cytosolic calcium, without affecting intracellular pH. A PKC inhibitor. GF-109203X. reduced ouabain-induced enhancement of histamine release and intracellular pH, but increased the enhancement on cytosolic calcium. Finally, inhibition of protein phosphatases 1 and 2A with okadaic acid. increased the effect of ouabain on histamine release and intracellular pH, but reduced cytosolic calcium in presence of ouabain. This result suggest that ouabain-induced potentiation of rat mast cell histamine release with A23187 is modulated by kinases, and this modulation may be carried out by changes in intracellular alkalinization. However. the mechanism underlying cellular alkalinization remains to be elucidated. (C) 2001 Elsevier Science Inc. All rights reserved. [References: 42]
机译:数字化的葡糖苷哇巴因响应几种刺激而诱导大鼠肥大细胞组胺释放的增强。这是由Naq / Ca2 +交换子介导的。在这项工作中。我们研究了哇巴因在旨在最大程度地由哇巴因诱导的大鼠肥大细胞应答增强的条件下,对Ca2 +离子载体A23 187的胞质钙,细胞内pH和组胺释放的影响。还测试了蛋白激酶C(PKC),cAMP和磷酸酶抑制作用。瓦巴因诱导组胺释放,胞质钙和细胞内pH升高。腺苷酸环化酶激活剂福司柯林降低了哇巴因对组胺释放和细胞内pH的作用,但增强了对胞质钙的作用。 PKC激活剂PMA增强了哇巴因对组胺释放和胞质钙的作用,而不会影响细胞内pH。 PKC抑制剂。 GF-109203X。降低了哇巴因诱导的组胺释放和细胞内pH增强,但增加了对胞质钙的增强。最后,用冈田酸抑制蛋白磷酸酶1和2A。增强了哇巴因对组胺释放和细胞内pH的影响,但在哇巴因存在时降低了胞质钙。该结果表明,哇巴因诱导的大鼠肥大细胞组胺用A23187的释放被激酶调节,并且该调节可以通过细胞内碱化的改变来进行。然而。细胞碱化的机理尚待阐明。 (C)2001 Elsevier Science Inc.保留所有权利。 [参考:42]

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