Differential effects of two-pore channel protein 1 and 2 silencing in MDA-MB-468 breast cancer cells
Two-pore channel proteins, TPC1 and TPC2, are calcium permeable ion channels found localized to the membranes of endolysosomal calcium stores. There is increasing interest in the role of TPC-mediated intracellular signaling in various pathologies; however their role in breast cancer has not been ext...
Main Authors: | , , , , |
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Format: | Article |
Language: | English |
Published: |
2016
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Subjects: | |
Online Access: | View Fulltext in Publisher |
Summary: | Two-pore channel proteins, TPC1 and TPC2, are calcium permeable ion channels found localized to the membranes of endolysosomal calcium stores. There is increasing interest in the role of TPC-mediated intracellular signaling in various pathologies; however their role in breast cancer has not been extensively evaluated. TPC1 and TPC2 mRNA was present in all non-tumorigenic and tumorigenic breast cell lines assessed. Silencing of TPC2 but not TPC1 attenuated epidermal growth factor-induced vimentin expression in MDA-MB-468 breast cancer cells. This effect was not due to a general inhibition of epithelial to mesenchymal transition (EMT) as TPC2 silencing had no effect on epidermal growth factor (EGF)-induced changes on E-cadherin expression. TPC1 and TPC2 were also shown to differentially regulate cyclopiazonic acid (CPA)-mediated changes in cytosolic free Ca2+. These findings indicate potential differential regulation of signaling processes by TPC1 and TPC2 in breast cancer cells. (C) 2016 Elsevier Inc. All rights reserved. |
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DOI: | 10.1016/j.bbrc.2016.06.127 |