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• W2012598982 endingPage "e36923" @default.
• W2012598982 startingPage "e36923" @default.
• W2012598982 abstract "In addition to their well-defined roles in replenishing depleted endoplasmic reticulum (ER) Ca(2+) reserves, molecular components of the store-operated Ca(2+) entry pathway regulate breast cancer metastasis. A process implicated in cancer metastasis that describes the conversion to a more invasive phenotype is epithelial-mesenchymal transition (EMT). In this study we show that EGF-induced EMT in MDA-MB-468 breast cancer cells is associated with a reduction in agonist-stimulated and store-operated Ca(2+) influx, and that MDA-MB-468 cells prior to EMT induction have a high level of non-stimulated Ca(2+) influx. The potential roles for specific Ca(2+) channels in these pathways were assessed by siRNA-mediated silencing of ORAI1 and transient receptor potential canonical type 1 (TRPC1) channels in MDA-MB-468 breast cancer cells. Non-stimulated, agonist-stimulated and store-operated Ca(2+) influx were significantly inhibited with ORAI1 silencing. TRPC1 knockdown attenuated non-stimulated Ca(2+) influx in a manner dependent on Ca(2+) influx via ORAI1. TRPC1 silencing was also associated with reduced ERK1/2 phosphorylation and changes in the rate of Ca(2+) release from the ER associated with the inhibition of the sarco/endoplasmic reticulum Ca(2+)-ATPase (time to peak [Ca(2+)](CYT) = 188.7 ± 34.6 s (TRPC1 siRNA) versus 124.0 ± 9.5 s (non-targeting siRNA); P<0.05). These studies indicate that EMT in MDA-MB-468 breast cancer cells is associated with a pronounced remodeling of Ca(2+) influx, which may be due to altered ORAI1 and/or TRPC1 channel function. Our findings also suggest that TRPC1 channels in MDA-MB-468 cells contribute to ORAI1-mediated Ca(2+) influx in non-stimulated cells." @default.
• W2012598982 created "2016-06-24" @default.
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• W2012598982 date "2012-05-30" @default.
• W2012598982 modified "2023-10-18" @default.
• W2012598982 title "Non-Stimulated, Agonist-Stimulated and Store-Operated Ca2+ Influx in MDA-MB-468 Breast Cancer Cells and the Effect of EGF-Induced EMT on Calcium Entry" @default.
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• W2012598982 doi "https://doi.org/10.1371/journal.pone.0036923" @default.
• W2012598982 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3364242" @default.
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