Journal
JOURNAL OF CELLULAR BIOCHEMISTRY
Volume 115, Issue 2, Pages 349-358Publisher
WILEY
DOI: 10.1002/jcb.24669
Keywords
TRAF5; CARDIAC HYPERTROPHY; FIBROSIS
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Funding
- National Natural Science Foundation of China [81000036, 30900524, 30972954, 81070089, 81000095]
- Specialized Research Fund for the Doctoral Program of Higher Education in China [20100141120070]
- Fundamental Research Funds for the Central Universities of China [20103020201000193, 201130202020007]
- Grants-in-Aid for Scientific Research [25670167, 26110003, 24390100] Funding Source: KAKEN
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The cytoplasmic signaling protein tumor necrosis factor (TNF) receptor-associated factor 5 (TRAF5), which was identified as a signal transducer for members of the TNF receptor super-family, has been implicated in several biological functions in T/B lymphocytes and the innate immune response against viral infection. However, the role of TRAF5 in cardiac hypertrophy has not been reported. In the present study, we investigated the effect of TRAF5 on the development of pathological cardiac hypertrophy induced by transthoracic aorta constriction (TAC) and further explored the underlying molecular mechanisms. Cardiac hypertrophy and function were evaluated with echocardiography, hemodynamic measurements, pathological and molecular analyses. For the first time, we found that TRAF5 deficiency substantially aggravated cardiac hypertrophy, cardiac dysfunction and fibrosis in response to pressure overload after 4 weeks of TAC compared to wild-type (WT) mice. Moreover, the mitogen-activated protein/extracellular signal-regulated kinase kinase (MEK)-extracellular signal-regulated kinases 1/2 (ERK1/2) signaling pathway was more activated in TRAF5-deficient mice than WT mice. In conclusion, our results suggest that as an intrinsic cardioprotective factor, TRAF5 plays a crucial role in the development of cardiac hypertrophy through the negative regulation of the MEK-ERK1/2 pathway. J. Cell. Biochem. 115: 349-358, 2014. (c) 2013 Wiley Periodicals, Inc.
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