Independence with respect to Ca2+ changes of the neutrophil respiratory and secretory response to exogenous phospholipase C and possible involvement of diacylglycerol and protein kinase C.

Independence with respect to Ca2+ changes of the neutrophil respiratory and secretory response to exogenous phospholipase C and possible involvement of diacylglycerol and protein kinase C.
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中性粒细胞对外源性磷脂酶 C 的呼吸和分泌反应的 Ca2 变化独立,二酰甘油和蛋白激酶 C 可能参与其中。

DOI:
10.1016/0167-4889(85)90237-x
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发表时间:
1985
期刊:
Biochimica et biophysica acta
影响因子:
--
通讯作者:
F. Rossi
F. Rossi
中科院分区:
--
文献类型:
--
作者:
M. Grzeskowiak;V. della Bianca;P. De Togni;E. Papini;F. Rossi

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外源性磷脂酶C在人中性粒细胞中诱导呼吸爆发的激活,测量为O2消耗和O2 -产生以及特定颗粒的分泌,测量为维生素B-12结合蛋白的释放。分泌反应是最小的,紧随呼吸反应的开始。使用预先标记了bbbb3h |甘油和32p的细胞对刺激的分子机制进行的研究表明,这种作用依赖于通过水解不同类别的甘油磷脂形成二酰基甘油。然而,它们独立于“磷酸肌肽转换”的激活,这发生在受fMet-Leu-Phe刺激的细胞中。此外,对外源性磷脂酶C的呼吸和分泌反应与用Quin-2方法测量的胞质Ca2+浓度的改变以及用膜探针氯四环素测量的结合Ca2+的释放无关。除了数量上的差异,主要是关于呼吸和分泌反应强度的比例,外源性磷脂酶C引起的影响是定性的;与肉豆蔻酸酯佛醇诱导的相似,可能与蛋白激酶C的参与有关,由质膜中释放的二酰基甘油激活。
Exogenous phospholipase C induces in human neutrophils the activation of a respiratory burst, measured as O2consumption and O2−production and of secretion of specific granules, measured as release of vitamin B-12 binding protein. The secretory response is minimal and follows the onset of the respiratory response. Studies carried out using cells prelabeled with |3H|glycerol and32P on the molecular mechanism of the stimulations demonstrate that the effects are dependent on the formation of diacylglycerol by hydrolysis of different classes of glycerophospholipids. They are, however, independent of the activation of a ‘phosphoinositide turnover’ as occurs in cells stimulated with fMet-Leu-Phe. Furthermore, the respiratory and secretory responses to exogenous phospholipase C are not associated with moditications of cytosolic Ca2+concentration measured with the Quin-2 method, and the release of bound Ca2+, measured with the membrane probe, chlorotetracycline. Apart from a quantitative difference, mostly regarding the ratio of the intensity of the respiratory and secretory responses, the effects caused by exogenous phospholipase C are qualitative;y similar to those induced by phorbol myristate acetate and are probably linked to an involvement of protein kinase C, activated by diacylglycerol liberated in the plasma membrane.
DOI: --
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