Intracellular calcium release modulates polycystin-2 trafficking.

Intracellular calcium release modulates polycystin-2 trafficking.
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DOI:
10.1186/1471-2369-14-34
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发表时间:
2013-02-11
期刊:
影响因子:
2.3
通讯作者:
Uhlén P
Uhlén P
中科院分区:
医学4区
文献类型:
--
作者:
Miyakawa A;Ibarra C;Malmersjö S;Aperia A;Wiklund P;Uhlén P

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多囊蛋白-2 (PC2) 由常染色体显性多囊肾病 (ADPKD) 中突变的基因编码,具有钙 (Ca2+) 渗透性离子通道的功能。关于 PC2 在肾细胞中的亚细胞定位和信号传导功能仍存在相当大的争议。我们在刺激胞质 Ca2+ 信号传导后,通过免疫细胞化学和共聚焦显微镜研究了人和大鼠近曲小管细胞原代培养物中 PC2 的亚细胞定位。使用延时荧光显微镜通过 Fura-2 锰猝灭评估质膜 (PM) Ca2+ 渗透性。我们证明了 PC2 表现出动态的亚细胞定位模式。在未刺激的人或大鼠近曲小管细胞中,PC2 表现出胞质/网状分布。使用以各种方式影响 Ca2+ 信号传导机制的药物(ATP、缓激肽、离子霉素、CPA 或毒胡萝卜素)进行治疗,会导致 PM 中 PC2 免疫染色增加。将细胞暴露于类固醇激素哇巴因(已知会触发肾细胞中的 Ca2+ 振荡)会导致 PM 中的 PC2 增加,并增加 PM Ca2+ 渗透性。使用 BAPTA 进行细胞内 Ca2+ 缓冲,使用 2-氨基乙氧基二苯硼酸盐 (2-APB) 抑制肌醇 1,4,5-三磷酸受体 (InsP3R) 或使用 KN-93 抑制 Ca2+/钙调蛋白依赖性激酶,完全消除了哇巴因刺激的 PC2 易位至 PM。这些新发现证明了人和大鼠肾细胞中 Ca2+ 依赖性 PC2 运输,这可能为 ADPKD 囊肿形成提供新的见解。
Polycystin-2 (PC2), encoded by the gene that is mutated in autosomal dominant polycystic kidney disease (ADPKD), functions as a calcium (Ca2+) permeable ion channel. Considerable controversy remains regarding the subcellular localization and signaling function of PC2 in kidney cells. We investigated the subcellular PC2 localization by immunocytochemistry and confocal microscopy in primary cultures of human and rat proximal tubule cells after stimulating cytosolic Ca2+ signaling. Plasma membrane (PM) Ca2+ permeability was evaluated by Fura-2 manganese quenching using time-lapse fluorescence microscopy. We demonstrated that PC2 exhibits a dynamic subcellular localization pattern. In unstimulated human or rat proximal tubule cells, PC2 exhibited a cytosolic/reticular distribution. Treatments with agents that in various ways affect the Ca2+ signaling machinery, those being ATP, bradykinin, ionomycin, CPA or thapsigargin, resulted in increased PC2 immunostaining in the PM. Exposing cells to the steroid hormone ouabain, known to trigger Ca2+ oscillations in kidney cells, caused increased PC2 in the PM and increased PM Ca2+ permeability. Intracellular Ca2+ buffering with BAPTA, inositol 1,4,5-trisphosphate receptor (InsP3R) inhibition with 2-aminoethoxydiphenyl borate (2-APB) or Ca2+/Calmodulin-dependent kinase inhibition with KN-93 completely abolished ouabain-stimulated PC2 translocation to the PM. These novel findings demonstrate intracellular Ca2+-dependent PC2 trafficking in human and rat kidney cells, which may provide new insight into cyst formations in ADPKD.
DOI: 10.1146/annurev.med.60.101707.125712
发表时间: 2009
影响因子: 10.5
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发表时间: 2004-10-01
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期刊: ACTA PHYSIOLOGICA
影响因子: 6.3
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DOI: 10.1093/hmg/11.1.59
发表时间: 2002-01-01
影响因子: 3.5
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