title: Calcium sensing receptor modulates extracellular calcium entry and proliferation via TRPC3/6 channels in cultured human mesangial cells.
abstract: Calcium-sensing receptor (CaSR) has been demonstrated to be present in several tissues and cells unrelated to systemic calcium homeostasis, where it regulates a series of diverse cellular functions. A previous study indicated that CaSR is expressed in mouse glomerular mesangial cells (MCs), and stimulation of CaSR induces cell proliferation. However, the signaling cascades initiated by CaSR activation in MCs are currently unknown. In this study, our data demonstrate that CaSR mRNA and protein are expressed in a human mesangial cell line. Activating CaSR with high extracellular Ca2+ concentration ([Ca2+]o) or spermine induces a phospholipase C (PLC)-dependent increase in intracellular Ca2+ concentration ([Ca2+]i). Interestingly, the CaSR activation-induced increase in [Ca2+]i results not only from intracellular Ca2+ release from internal stores but also from canonical transient receptor potential (TRPC)-dependent Ca2+ influx. This increase in Ca2+ was attenuated by treatment with a nonselective TRPC channel blocker but not by treatment with a voltage-gated calcium blocker or Na+/Ca2+ exchanger inhibitor. Furthermore, stimulation of CaSR by high [Ca2+]o enhanced the expression of TRPC3 and TRPC6 but not TRPC1 and TRPC4, and siRNA targeting TRPC3 and TRPC6 attenuated the CaSR activation-induced [Ca2+]i increase. Further experiments indicate that 1-oleoyl-2-acetyl-sn-glycerol (OAG), a known activator of receptor-operated calcium channels, significantly enhances the CaSR activation-induced [Ca2+]i increase. Moreover, under conditions in which intracellular stores were already depleted with thapsigargin (TG), CaSR agonists also induced an increase in [Ca2+]i, suggesting that calcium influx stimulated by CaSR agonists does not require the release of calcium stores. Finally, our data indicate that pharmacological inhibition and knock down of TRPC3 and TRPC6 attenuates the CaSR activation-induced cell proliferation in human MCs. With these data, we conclude that CaSR activation mediates Ca2+ influx and cell proliferation via TRPC3 and TRPC6 in human MCs.
authors.affiliation: Department of Nephrology, The Second Affiliated Hospital, Harbin Medical University, Harbin, China.
authors.forename: Kexin
authors.initials: K
authors.lastname: Meng
authors.affiliation: Department of Nephrology, The Fourth Affiliated Hospital, Harbin Medical University, Harbin, China.
authors.forename: Jia
authors.initials: J
authors.lastname: Xu
authors.affiliation: Department of Nephrology, The Second Affiliated Hospital, Harbin Medical University, Harbin, China.
authors.forename: Chengwei
authors.initials: C
authors.lastname: Zhang
authors.affiliation: Department of Nephrology, The Second Affiliated Hospital, Harbin Medical University, Harbin, China.
authors.forename: Rui
authors.initials: R
authors.lastname: Zhang
authors.affiliation: Department of Nephrology, The Second Affiliated Hospital, Harbin Medical University, Harbin, China.
authors.forename: He
authors.initials: H
authors.lastname: Yang
authors.affiliation: Department of Nephrology, The Second Affiliated Hospital, Harbin Medical University, Harbin, China.
authors.forename: Chang
authors.initials: C
authors.lastname: Liao
authors.affiliation: Department of Nephrology, The Second Affiliated Hospital, Harbin Medical University, Harbin, China; Institute of Nephrology, Harbin Medical University, Harbin, China.
authors.forename: Jundong
authors.initials: J
authors.lastname: Jiao
mesh_terms: D000818:Animals; D001692:Biological Transport / Q000187:drug effects; D002118:Calcium / Q000378:metabolism*; D002460:Cell Line; D049109:Cell Proliferation / Q000187:drug effects; D005110:Extracellular Space / Q000187:drug effects / Q000378:metabolism*; D005786:Gene Expression Regulation / Q000187:drug effects; D006801:Humans; D050527:Mesangial Cells / Q000166:cytology* / Q000378:metabolism*; D051379:Mice; D044169:Receptors, Calcium-Sensing / Q000819:agonists / Q000378:metabolism*; D050052:TRPC Cation Channels / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D000074287:TRPC6 Cation Channel
chemical_list: D044169:Receptors, Calcium-Sensing; D050052:TRPC Cation Channels; C104603:TRPC3 cation channel; D000074287:TRPC6 Cation Channel; C117032:TRPC6 protein, human; D002118:Calcium