Store-independent activation of Orai1 by SPCA2 in mammary tumors.
Store-independent activation of Orai1 by SPCA2 in mammary tumors.
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DOI:
10.1016/j.cell.2010.08.040
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发表时间:
2010-10-01
期刊:
影响因子:
64.5
通讯作者:
Rao R
中科院分区:
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
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.
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影响因子:
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作者:
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通讯作者:
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DOI:
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