Local Ca²+ entry via Orai1 regulates plasma membrane recruitment of TRPC1 and controls cytosolic Ca²+ signals required for specific cell functions.

Store-operated Ca²+ entry (SOCE) has been associated with two types of channels: CRAC channels that require Orai1 and STIM1 and SOC channels that involve TRPC1, Orai1, and STIM1. While TRPC1 significantly contributes to SOCE and SOC channel activity, abrogation of Orai1 function eliminates SOCE and...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Kwong Tai Cheng, Xibao Liu, Hwei Ling Ong, William Swaim, Indu S Ambudkar
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2011
Materias:	Biology (General) QH301-705.5
Acceso en línea:	https://doaj.org/article/64322283275949cf89a087ca6b28f5c3
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:64322283275949cf89a087ca6b28f5c3
record_format	dspace
spelling	oai:doaj.org-article:64322283275949cf89a087ca6b28f5c32021-11-18T05:36:18ZLocal Ca²+ entry via Orai1 regulates plasma membrane recruitment of TRPC1 and controls cytosolic Ca²+ signals required for specific cell functions.1544-91731545-788510.1371/journal.pbio.1001025https://doaj.org/article/64322283275949cf89a087ca6b28f5c32011-03-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/21408196/pdf/?tool=EBIhttps://doaj.org/toc/1544-9173https://doaj.org/toc/1545-7885Store-operated Ca²+ entry (SOCE) has been associated with two types of channels: CRAC channels that require Orai1 and STIM1 and SOC channels that involve TRPC1, Orai1, and STIM1. While TRPC1 significantly contributes to SOCE and SOC channel activity, abrogation of Orai1 function eliminates SOCE and activation of TRPC1. The critical role of Orai1 in activation of TRPC1-SOC channels following Ca²+ store depletion has not yet been established. Herein we report that TRPC1 and Orai1 are components of distinct channels. We show that TRPC1/Orai1/STIM1-dependent I(SOC), activated in response to Ca²+ store depletion, is composed of TRPC1/STIM1-mediated non-selective cation current and Orai1/STIM1-mediated I(CRAC); the latter is detected when TRPC1 function is suppressed by expression of shTRPC1 or a STIM1 mutant that lacks TRPC1 gating, STIM1(⁶⁸⁴EE⁶⁸⁵). In addition to gating TRPC1 and Orai1, STIM1 mediates the recruitment and association of the channels within ER/PM junctional domains, a critical step in TRPC1 activation. Importantly, we show that Ca²+ entry via Orai1 triggers plasma membrane insertion of TRPC1, which is prevented by blocking SOCE with 1 µM Gd³+, removal of extracellular Ca²+, knockdown of Orai1, or expression of dominant negative mutant Orai1 lacking a functional pore, Orai1-E106Q. In cells expressing another pore mutant of Orai1, Orai1-E106D, TRPC1 trafficking is supported in Ca²+-containing, but not Ca²+-free, medium. Consistent with this, I(CRAC) is activated in cells pretreated with thapsigargin in Ca²+-free medium while I(SOC) is activated in cells pretreated in Ca²+-containing medium. Significantly, TRPC1 function is required for sustained K(Ca) activity and contributes to NFκB activation while Orai1 is sufficient for NFAT activation. Together, these findings reveal an as-yet unidentified function for Orai1 that explains the critical requirement of the channel in the activation of TRPC1 following Ca²+ store depletion. We suggest that coordinated regulation of the surface expression of TRPC1 by Orai1 and gating by STIM1 provides a mechanism for rapidly modulating and maintaining SOCE-generated Ca²+ signals. By recruiting ion channels and other signaling pathways, Orai1 and STIM1 concertedly impact a variety of critical cell functions that are initiated by SOCE.Kwong Tai ChengXibao LiuHwei Ling OngWilliam SwaimIndu S AmbudkarPublic Library of Science (PLoS)articleBiology (General)QH301-705.5ENPLoS Biology, Vol 9, Iss 3, p e1001025 (2011)
institution	DOAJ
collection	DOAJ
language	EN
topic	Biology (General) QH301-705.5
spellingShingle	Biology (General) QH301-705.5 Kwong Tai Cheng Xibao Liu Hwei Ling Ong William Swaim Indu S Ambudkar Local Ca²+ entry via Orai1 regulates plasma membrane recruitment of TRPC1 and controls cytosolic Ca²+ signals required for specific cell functions.
description	Store-operated Ca²+ entry (SOCE) has been associated with two types of channels: CRAC channels that require Orai1 and STIM1 and SOC channels that involve TRPC1, Orai1, and STIM1. While TRPC1 significantly contributes to SOCE and SOC channel activity, abrogation of Orai1 function eliminates SOCE and activation of TRPC1. The critical role of Orai1 in activation of TRPC1-SOC channels following Ca²+ store depletion has not yet been established. Herein we report that TRPC1 and Orai1 are components of distinct channels. We show that TRPC1/Orai1/STIM1-dependent I(SOC), activated in response to Ca²+ store depletion, is composed of TRPC1/STIM1-mediated non-selective cation current and Orai1/STIM1-mediated I(CRAC); the latter is detected when TRPC1 function is suppressed by expression of shTRPC1 or a STIM1 mutant that lacks TRPC1 gating, STIM1(⁶⁸⁴EE⁶⁸⁵). In addition to gating TRPC1 and Orai1, STIM1 mediates the recruitment and association of the channels within ER/PM junctional domains, a critical step in TRPC1 activation. Importantly, we show that Ca²+ entry via Orai1 triggers plasma membrane insertion of TRPC1, which is prevented by blocking SOCE with 1 µM Gd³+, removal of extracellular Ca²+, knockdown of Orai1, or expression of dominant negative mutant Orai1 lacking a functional pore, Orai1-E106Q. In cells expressing another pore mutant of Orai1, Orai1-E106D, TRPC1 trafficking is supported in Ca²+-containing, but not Ca²+-free, medium. Consistent with this, I(CRAC) is activated in cells pretreated with thapsigargin in Ca²+-free medium while I(SOC) is activated in cells pretreated in Ca²+-containing medium. Significantly, TRPC1 function is required for sustained K(Ca) activity and contributes to NFκB activation while Orai1 is sufficient for NFAT activation. Together, these findings reveal an as-yet unidentified function for Orai1 that explains the critical requirement of the channel in the activation of TRPC1 following Ca²+ store depletion. We suggest that coordinated regulation of the surface expression of TRPC1 by Orai1 and gating by STIM1 provides a mechanism for rapidly modulating and maintaining SOCE-generated Ca²+ signals. By recruiting ion channels and other signaling pathways, Orai1 and STIM1 concertedly impact a variety of critical cell functions that are initiated by SOCE.
format	article
author	Kwong Tai Cheng Xibao Liu Hwei Ling Ong William Swaim Indu S Ambudkar
author_facet	Kwong Tai Cheng Xibao Liu Hwei Ling Ong William Swaim Indu S Ambudkar
author_sort	Kwong Tai Cheng
title	Local Ca²+ entry via Orai1 regulates plasma membrane recruitment of TRPC1 and controls cytosolic Ca²+ signals required for specific cell functions.
title_short	Local Ca²+ entry via Orai1 regulates plasma membrane recruitment of TRPC1 and controls cytosolic Ca²+ signals required for specific cell functions.
title_full	Local Ca²+ entry via Orai1 regulates plasma membrane recruitment of TRPC1 and controls cytosolic Ca²+ signals required for specific cell functions.
title_fullStr	Local Ca²+ entry via Orai1 regulates plasma membrane recruitment of TRPC1 and controls cytosolic Ca²+ signals required for specific cell functions.
title_full_unstemmed	Local Ca²+ entry via Orai1 regulates plasma membrane recruitment of TRPC1 and controls cytosolic Ca²+ signals required for specific cell functions.
title_sort	local ca²+ entry via orai1 regulates plasma membrane recruitment of trpc1 and controls cytosolic ca²+ signals required for specific cell functions.
publisher	Public Library of Science (PLoS)
publishDate	2011
url	https://doaj.org/article/64322283275949cf89a087ca6b28f5c3
work_keys_str_mv	AT kwongtaicheng localca2entryviaorai1regulatesplasmamembranerecruitmentoftrpc1andcontrolscytosolicca2signalsrequiredforspecificcellfunctions AT xibaoliu localca2entryviaorai1regulatesplasmamembranerecruitmentoftrpc1andcontrolscytosolicca2signalsrequiredforspecificcellfunctions AT hweilingong localca2entryviaorai1regulatesplasmamembranerecruitmentoftrpc1andcontrolscytosolicca2signalsrequiredforspecificcellfunctions AT williamswaim localca2entryviaorai1regulatesplasmamembranerecruitmentoftrpc1andcontrolscytosolicca2signalsrequiredforspecificcellfunctions AT indusambudkar localca2entryviaorai1regulatesplasmamembranerecruitmentoftrpc1andcontrolscytosolicca2signalsrequiredforspecificcellfunctions
_version_	1718424914866733056

Local Ca²+ entry via Orai1 regulates plasma membrane recruitment of TRPC1 and controls cytosolic Ca²+ signals required for specific cell functions.

Ejemplares similares