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• W2052698385 abstract "Although Orai1 protein was recently identified as the component of CRAC channels in hematopoietic cells, store-operated channels (SOC) in other cell types may have a different molecular entity. Also, the activation mechanism of SOC remains unclear, in general. In the present study, we tested the hypothesis that TRPC1 and TRPC4 proteins were functional subunits of SOC in glomerular mesangial cells (MCs) and that STIM1 was required for the channel activation through interaction with the TRPC proteins. In cultured human MCs, cell-attached patch clamp and fura-2 fluorescence measurements showed that single knockdown of either TRPC1 or TRPC4 significantly attenuated thapsigargin-induced membrane currents and Ca2+ entry as well as Ang II-induced channel activity. Double knockdown of both TRPCs resulted in a comparable inhibition on store-operated Ca2+ entry with single knockdown of either TRPC. Consistent with our previous report, co-immunoprecipitation showed a physical interaction between TRPC1 and TRPC4. Furthermore, we found that knockdown of STIM1 using RNAi significantly reduced the thapsigargin-stimulated membrane currents. Co-immunoprecipitation showed that STIM1 interacted with TRPC4, but not TRPC1. In addition, simultaneous inhibition of STIM1 and TRPC1 resulted in a comparable effect on SOC with single inhibition of either one of them. Taken together, we conclude that in glomerular mesangial cells, the TRPC1/TRPC4 complexes constitute the functional subunits of SOC and that the interaction between STIM1 and TRPC4 may be the mechanism for the activation of the channels." @default.
• W2052698385 created "2016-06-24" @default.
• W2052698385 creator A5006025102 @default.
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• W2052698385 date "2009-06-01" @default.
• W2052698385 modified "2023-09-29" @default.
• W2052698385 title "Interaction Between TRPC1/TRPC4 Assembly and STIM1 Contributes to Store-Operated Ca²⁺ Entry in Mesangial Cells" @default.
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• W2052698385 doi "https://doi.org/10.3181/0809-rm-279" @default.
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