title: A novel native store-operated calcium channel encoded by Orai3: selective requirement of Orai3 versus Orai1 in estrogen receptor-positive versus estrogen receptor-negative breast cancer cells.
abstract: Store-operated calcium (Ca(2+)) entry (SOCE) mediated by STIM/Orai proteins is a ubiquitous pathway that controls many important cell functions including proliferation and migration. STIM proteins are Ca(2+) sensors in the endoplasmic reticulum and Orai proteins are channels expressed at the plasma membrane. The fall in endoplasmic reticulum Ca(2+) causes translocation of STIM1 to subplasmalemmal puncta where they activate Orai1 channels that mediate the highly Ca(2+)-selective Ca(2+) release-activated Ca(2+) current (I(CRAC)). Whereas Orai1 has been clearly shown to encode SOCE channels in many cell types, the role of Orai2 and Orai3 in native SOCE pathways remains elusive. Here we analyzed SOCE in ten breast cell lines picked in an unbiased way. We used a combination of Ca(2+) imaging, pharmacology, patch clamp electrophysiology, and molecular knockdown to show that native SOCE and I(CRAC) in estrogen receptor-positive (ER(+)) breast cancer cell lines are mediated by STIM1/2 and Orai3 while estrogen receptor-negative (ER(-)) breast cancer cells use the canonical STIM1/Orai1 pathway. The ER(+) breast cancer cells represent the first example where the native SOCE pathway and I(CRAC) are mediated by Orai3. Future studies implicating Orai3 in ER(+) breast cancer progression might establish Orai3 as a selective target in therapy of ER(+) breast tumors.
authors.affiliation: Center for Cardiovascular Sciences, Albany Medical College, Albany, New York 12208, USA.
authors.forename: Rajender K
authors.initials: RK
authors.lastname: Motiani
authors.forename: Iskandar F
authors.initials: IF
authors.lastname: Abdullaev
authors.forename: Mohamed
authors.initials: M
authors.lastname: Trebak
mesh_terms: D001943:Breast Neoplasms / Q000378:metabolism*; D002118:Calcium / Q000378:metabolism; D015220:Calcium Channels / Q000378:metabolism*; D015815:Cell Adhesion Molecules / Q000378:metabolism; D045744:Cell Line, Tumor; D018450:Disease Progression; D004721:Endoplasmic Reticulum / Q000378:metabolism; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D008565:Membrane Proteins / Q000378:metabolism; D009363:Neoplasm Proteins / Q000378:metabolism; D000071740:ORAI1 Protein; D018408:Patch-Clamp Techniques; D021381:Protein Transport; D011960:Receptors, Estrogen / Q000378:metabolism*; D000071737:Stromal Interaction Molecule 1; D000071738:Stromal Interaction Molecule 2
chemical_list: D015220:Calcium Channels; D015815:Cell Adhesion Molecules; D008565:Membrane Proteins; D009363:Neoplasm Proteins; D000071740:ORAI1 Protein; C510746:ORAI1 protein, human; C522867:Orai3 protein, human; D011960:Receptors, Estrogen; C103530:STIM1 protein, human; C513279:STIM2 protein, human; D000071737:Stromal Interaction Molecule 1; D000071738:Stromal Interaction Molecule 2; D002118:Calcium
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