Store-independent activation of Orai1 by SPCA2 in mammary tumors.

Store-independent activation of Orai1 by SPCA2 in mammary tumors.
复制标题

DOI:
10.1016/j.cell.2010.08.040
复制
发表时间:
2010-10-01
期刊:
影响因子:
64.5
通讯作者:
Rao R
Rao R
中科院分区:
生物学1区
文献类型:
--
作者:
Feng M;Grice DM;Faddy HM;Nguyen N;Leitch S;Wang Y;Muend S;Kenny PA;Sukumar S;Roberts-Thomson SJ;Monteith GR;Rao R

文献摘要

参考文献

被引文献

相似文献

Ca~(2+)是一种重要的、普遍存在的第二信使。细胞内钙离子的变化触发了肿瘤发生的关键事件,如细胞运动、增殖和凋亡。我们发现,分泌途径钙-ATPase的一个亚型SPCA2在乳腺癌来源的细胞和人类乳腺肿瘤中上调,抑制SPCA2可减弱基础钙水平和致瘤性。与其在高尔基体钙离子封存中的传统作用相反,SPCA2的表达增加了钙离子内流,其机制依赖于存储操作的钙通道Orai1。出乎意料的是,SPCA2-Orai1信号不依赖于内质网钙库或STIM1和STIM2感受器,而不依赖于SPCA2的钙-ATPase活性。SPCA2氨基末端与Orai1结合后,其羧基末端可与Orai1结合,激活钙离子内流。我们的发现揭示了Orai1-SPCA2复合体诱导结构性的不依赖于钙的钙信号促进肿瘤发生的信号通路。
Ca2+ is an essential and ubiquitous second messenger. Changes in cytosolic Ca2+ trigger events critical for tumorigenesis, such as cellular motility, proliferation and apoptosis. We show that an isoform of Secretory Pathway Ca2+-ATPase, SPCA2, is upregulated in breast cancer-derived cells and human breast tumors, and suppression of SPCA2 attenuated basal Ca2+ levels and tumorigenicity. Contrary to its conventional role in Golgi Ca2+ sequestration, expression of SPCA2 increased Ca2+ influx by a mechanism dependent on the store-operated Ca2+ channel Orai1. Unexpectedly, SPCA2-Orai1 signaling was independent of ER Ca2+ stores or STIM1 and STIM2 sensors, and uncoupled from Ca2+-ATPase activity of SPCA2. Binding of SPCA2 amino terminus to Orai1 enabled access of its carboxyl terminus to Orai1 and activation of Ca2+ influx. Our findings reveal a signaling pathway in which Orai1-SPCA2 complex elicits constitutive store-independent Ca2+ signaling that promotes tumorigenesis.
DOI: 10.1074/jbc.m801738200
发表时间: 2008-09-05
影响因子: 4.8
作者:
Mamillapalli, Ramanaiah;VanHouten, Joshua;Wysolmerski, John
通讯作者: Wysolmerski, John
DOI: 10.1016/j.bbrc.2008.03.003
发表时间: 2008-05-09
影响因子: 3.1
作者:
Faddy, Helen M.;Smart, Chanel E.;Monteith, Gregory R.
通讯作者: Monteith, Gregory R.
DOI: 10.1126/science.1065693
发表时间: 2002-01-18
期刊: SCIENCE
影响因子: 56.9
作者:
Matsumoto, Y;Maller, JL
通讯作者: Maller, JL
DOI: 10.1091/mbc.9.5.1149
发表时间: 1998-05-01
影响因子: 3.3
作者:
Dürr, G;Strayle, J;Rudolph, HK
通讯作者: Rudolph, HK
DOI: 10.1016/j.ceca.2007.03.007
发表时间: 2007-08-01
期刊: CELL CALCIUM
影响因子: 4
作者:
Gwack, Yousang;Feske, Stefan;Rao, Anjana
通讯作者: Rao, Anjana