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Deprecated: Implicit conversion from float 227.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Proc+Natl+Acad+Sci+U+S+A 2013 ; 110 (32): E3037-46 Nephropedia Template TP
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Ion channel-kinase TRPM7 is required for maintaining cardiac automaticity #MMPMID23878236
Sah R; Mesirca P; Van den Boogert M; Rosen J; Mably J; Mangoni ME; Clapham DE
Proc Natl Acad Sci U S A 2013[Aug]; 110 (32): E3037-46 PMID23878236show ga
Transient Receptor Potential Melastatin 7 (TRPM7) is a divalent-permeant channel-kinase of unknown function expressed in human atrial myocytes and fibroblasts and recently implicated in atrial arrhythmias. We show that TRPM7 is highly expressed in embryonic myocardium and sinoatrial node (SAN). Trpm7 disruption in vitro, in cultured embryonic cardiomyocytes, and in vivo in zebrafish and in mice impairs cardiac automaticity. We show that this occurs via reductions in Hcn4 mRNA and the pacemaker current, If, in SAN. We conclude that TRPM7 influences diastolic membrane depolarization and automaticity in SAN via regulation of Hcn4 expression.