Calcium store contents control the expression of TRPC1, TRPC3 and TRPV6 proteins in LNCaP prostate cancer cell line

Cell Calcium
Delphine PigozziPhilippe Gailly

Abstract

The mammalian homologues of the Drosophila transient receptor potential (TRP) represent a superfamily of ion channels involved in Ca(2+) homeostasis. Several members of this family are activated either by a depletion of the internal stores of Ca(2+) or by stimulation of G protein-coupled receptors. In androgen responsive prostate cancer cell line LNCaP, TRPC1, TRPC4 and/or TRPV6 have been reported to function as store-operated channels (SOCs) while TRPC3 might be involved in the response to agonist stimulation, possibly through the induction of diacylglycerol production by phospholipase C. However, the control of expression of these TRP proteins is largely unknown. In the present study, we have investigated if the expression of the TRP proteins possibly involved in the capacitative influx of calcium is influenced by the contents of Ca(2+) in the endoplasmic reticulum. Using real-time PCR and Western blot techniques, we show that the expression of TRPC1, TRPC3 and TRPV6 proteins increases after a prolonged (24-48 h) depletion of the stores with thapsigargin. The upregulation of TRPC1 and TRPC3 depends on the store contents level and involves the activation of the Ca(2+)/calmodulin/calcineurin/NFAT pathway. Functionally, cells ov...Continue Reading

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