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Resistance to pathologic cardiac hypertrophy and reduced expression of CaV1.2 in Trpc3-depleted mice

 Jung Woo Han  ;  Young Ho Lee  ;  Su-In Yoen  ;  Joel Abramowitz  ;  Lutz Birnbaumer  ;  Min Goo Lee  ;  Joo Young Kim 
 Molecular and Cellular Biochemistry, Vol.421(1~2) : 55-65, 2016 
Journal Title
 Molecular and Cellular Biochemistry 
Issue Date
Animals ; Calcium Channels, L-Type/biosynthesis* ; Calcium Channels, L-Type/genetics ; Calcium Signaling* ; Cardiomegaly/genetics ; Cardiomegaly/metabolism* ; Cardiomegaly/pathology ; Gene Expression Regulation* ; Mesenteric Arteries/metabolism ; Mesenteric Arteries/pathology ; Mice ; Mice, Knockout ; Myocardium/metabolism* ; Myocardium/pathology ; Phenylephrine/metabolism ; TRPC Cation Channels/deficiency* ; Vasoconstriction/genetics
Ca2+ influx ; L-type Ca2+ channel ; Pathologic cardiac hypertrophy ; Transient receptor potential canonical channels 3
Sustained elevation of intracellular Ca(2+) concentration ([Ca(2+)]i) reprograms cardiovascular cell fate, leading to cellular hypertrophy via Ca(2+)-calmodulin/calcineurin (Cn)/NFAT activation. Accumulating evidence suggests that transient receptor potential canonical (Trpc) channels play important roles in the development of pathologic cardiac hypertrophy. Here, we demonstrated that Trpc3 mediates pathologic cardiac hypertrophy in neurohumoral elevation via direct regulation of CaV1.2 expressions. Elevated PE (phenylephrine) was maintained in mice by continuous infusion using an osmotic pump. Wild-type (WT) mice, but not Trpc3 (-/-) showed a sudden decrease in blood pressure (BP) or death following elevation of BP under conditions of elevated PE. Trpc3 (-/-) mesenteric artery showed decreased PE-stimulated vasoconstriction. Analysis of morphology, function, and pathologic marker expression revealed that PE elevation caused pathologic cardiac hypertrophy in WT mice, which was prevented by deletion of Trpc3. Interestingly, protection by Trpc3 deletion seemed to be a result of reduced cardiac CaV1.2 expressions. Basal and PE induced increased expression of protein and mRNA of CaV1.2 was decreased in Trpc3 (-/-) heart. Accordingly, altered expression of CaV1.2 was observed by knockdown or stimulation of Trpc3 in cardiomyocytes. These findings suggest that Trpc3 is a mediator of pathologic cardiac hypertrophy not only through mediating part of the Ca(2+) influx, but also through control of CaV1.2 expressions.
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1. College of Medicine (의과대학) > Dept. of Pharmacology (약리학교실) > 1. Journal Papers
1. College of Medicine (의과대학) > Dept. of Physiology (생리학교실) > 1. Journal Papers
Yonsei Authors
Kim, Joo Young(김주영) ORCID logo https://orcid.org/0000-0003-2623-1491
Lee, Min Goo(이민구) ORCID logo https://orcid.org/0000-0001-7436-012X
Lee, Young Ho(이영호) ORCID logo https://orcid.org/0000-0002-5749-1045
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