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Circ Heart Fail. 2013 May;6(3):535-43. doi: 10.1161/CIRCHEARTFAILURE.112.000080. Epub 2013 Mar 14.

Tumor necrosis factor receptor-associated factor 2 signaling provokes adverse cardiac remodeling in the adult mammalian heart.

Author information

1
Winters Center for Heart Failure Research Section of Cardiology, Baylor College of Medicine, Houston, TX, USA.

Abstract

BACKGROUND:

Tumor necrosis factor superfamily ligands provoke a dilated cardiac phenotype signal through a common scaffolding protein termed tumor necrosis factor receptor-associated factor 2 (TRAF2); however, virtually nothing is known about TRAF2 signaling in the adult mammalian heart.

METHODS AND RESULTS:

We generated multiple founder lines of mice with cardiac-restricted overexpression of TRAF2 and characterized the phenotype of mice with higher expression levels of TRAF2 (myosin heavy chain [MHC]-TRAF2(HC)). MHC-TRAF2(HC) transgenic mice developed a time-dependent increase in cardiac hypertrophy, left ventricular dilation, and adverse left ventricular remodeling, and a significant decrease in LV+dP/dt and LV-dP/dt when compared with littermate controls (P<0.05 compared with littermate). During the early phases of left ventricular remodeling, there was a significant increase in total matrix metalloproteinase activity that corresponded with a decrease in total myocardial fibrillar collagen content. As the MHC-TRAF2(HC) mice aged, there was a significant decrease in total matrix metalloproteinase activity accompanied by an increase in total fibrillar collagen content and an increase in myocardial tissue inhibitor of metalloproteinase-1 levels. There was a significant increase in nuclear factor-κB activation at 4 to 12 weeks and jun N-terminal kinases activation at 4 weeks in the MHC-TRAF2(HC) mice. Transciptional profiling revealed that >95% of the hypertrophic/dilated cardiomyopathy-related genes that were significantly upregulated genes in the MHC-TRAF2(HC) hearts contained κB elements in their promoters.

CONCLUSIONS:

These results show for the first time that targeted overexpression of TRAF2 is sufficient to mediate adverse cardiac remodeling in the heart.

KEYWORDS:

TNF receptor–associated factor 2; dilated cardiomyopathy; inflammation; tumor necrosis factor superfamily

[Indexed for MEDLINE]
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