ジアシルグリセロール感受性TRPCチャネルを介した心肥大誘導のメカニズム

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Activation of Ca2+ signaling in cardiomyocytes induced by receptor stimulation or mechanical stress has been implicated in the development of cardiac hypertrophy. However, it is still unclear how intracellular Ca2+ targets specifically decode the alteration of intracellular Ca2+ concentration ([Ca2+]i) on the background of the rhythmic Ca2+ increases required for muscle contraction. In excitable cardiomyocytes, changes in the frequency or amplitude of Ca2+ transients evoked by Ca2+ influx-induced Ca2+ release have been suggested to encode signals for induction of hypertrophy, and a partial depolarization of plasma membrane by receptor stimulation will increase the frequency of Ca2+ oscillations. We found that activation of diacylglycerol (DAG)-responsive canonical transient receptor potential (TRPC) subfamily channels (TRPC3 and TRPC6) mediate membrane depolarization induced by Gq protein-coupled receptor stimulation. DAG-mediated membrane depolarization through activation of TRPC3/TRPC6 channels increases the frequency of Ca2+ spikes, leading to activation of calcineurin-dependent signaling pathways. Inhibition of either TRPC3 or TRPC6 completely suppressed agonist-induced hypertrophic responses, suggesting that TRPC3 and TRPC6 form heterotetramer channels. Furthermore, we found that hypertrophic agonists increase the expression of TRPC6 proteins through activation of G12 family proteins, leading to amplification of DAG-mediated hypertrophic signaling in cardiomyocytes. As heart failure proceeds through cardiac hypertrophy, TRPC3/TRPC6 channels may be a new therapeutic target for heart failure.

ジアシルグリセロール感受性TRPCチャネルを介した心肥大誘導のメカニズム

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