Subcellular distribution of Ca2+ pumping sites in human neutrophils.

Subcellular distribution of Ca2+ pumping sites in human neutrophils.
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人中性粒细胞中 Ca2+泵站的亚细胞分布。

DOI:
--
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发表时间:
1987
影响因子:
15.9
通讯作者:
P. Lew
P. Lew
中科院分区:
医学1区
文献类型:
--
作者:
K. Krause;P. Lew

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本文研究了人中性粒细胞亚细胞组分中非线粒体Ca ~(2+)泵位点的分布和三磷酸肌醇(Ins 1,4,5-P_3)的作用位点。在匀浆中,可以观察到两个不同的Ca 2+池:线粒体Ca 2+池和非线粒体的,ATP依赖的,Ins 1,4,5-P3-响应的Ca 2+池。当匀浆被分离成微粒体,初级颗粒,和次级颗粒,非线粒体Ca 2+泵和Ins 1,4,5-P3诱导的Ca 2+释放只发生在微粒体部分。在分离不同微粒体细胞器的梯度中,最大的Ca 2+泵送活性发生在低密度的部分中。内质网Ca ~(2+)摄取与细胞器标志物呈负相关(r = -0.49),质膜、高尔基体和核内体Ca ~(2+)摄取与细胞器标志物呈正相关(r = 0.47、r = 0.62和r = 0.96)。由于这些组分中的Ca 2+泵细胞器对微摩尔钒酸盐和毛地黄皂苷处理不敏感,因此它们不太可能是质膜囊泡。我们的结论是第一,微粒体部分的人中性粒细胞含有细胞器,降低周围的游离Ca 2+浓度,并响应于胰岛素1,4,5-P3。第二,颗粒不参与中性粒细胞的细胞内Ca 2+调节。第三,非内质网细胞器,如核内体,高尔基体元素,或尚未定义的专门结构,在人类中性粒细胞胞内Ca 2+稳态中发挥重要作用。
The distribution of nonmitochondrial Ca2+ pumping sites and the site of action of inositol 1,4,5-trisphosphate (Ins 1,4,5-P3) were studied in subcellular fractions of human neutrophils. In homogenates, two different Ca2+ pools could be observed: a mitochondrial Ca2+ pool and a nonmitochondrial, ATP-dependent, Ins 1,4,5-P3-responsive Ca2+ pool. When the homogenate was separated into microsomes, primary granules, and secondary granules, the nonmitochondrial Ca2+ pumping and the Ins 1,4,5-P3-induced Ca2+ release occurred only in the microsomal fraction. In a gradient developed to separate different microsomal organelles, maximal Ca2+ pumping activity occurred in fractions of low densities. Correlations between Ca2+ uptake and organelle markers were negative for the endoplasmic reticulum (r = -0.49) and positive for plasma membrane (r = 0.47), Golgi (r = 0.62), and endosomes (r = 0.96). Because the Ca2+ pumping organelles in these fractions were insensitive to micromolar vanadate and digitonin treatment, they are unlikely to be plasma membrane vesicles. We conclude first that microsomal fractions of human neutrophils contain organelles that lower the ambient free Ca2+ concentration and respond to Ins 1,4,5-P3. Second, granules are not involved in intracellular Ca2+ regulation in neutrophils. Third, nonendoplasmic reticulum organelles, such as endosomes, Golgi elements, or yet undefined specialized structures, play a major role in intracellular Ca2+ homeostasis in human neutrophils.
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