Abstract
Background
The aging heart is characterized by cellular and molecular changes leading to a decline in physiologic function and cardiac remodeling, specifically the development of myocyte hypertrophy and fibrosis. Transient receptor potential vanilloid 2 (TRPV2), a stretch-mediated channel and regulator of calcium homeostasis, plays a key role in the function and structure of the heart. TRPV2 also plays an important role in the adaptive and maladaptive compensatory mechanisms of the heart in response to pathologic and exercise-induced stress. Our current study seeks to elucidate the potential role of TRPV2 channels in the regulation of cardiac function in aging.
Methods
Wild-type (WT) and TRPV2 functional knockout (FKO) mice were aged out to various time points, and their cardiac function was measured using advanced echocardiography. Furthermore, we histologically analyzed the heart morphology to determine myocyte hypertrophy, the development of fibrosis and the relative expression of TRPV2.
Results
Our results demonstrate that even though TRPV2-FKO mice have impaired function at baseline, their cardiac function as measured via standard and advanced echocardiographic parameters (ejection fraction, cardiac output and circumferential strain) decreased less with aging in comparison with the WT group. Furthermore, there was less fibrosis and hypertrophy in the TRPV2-FKO group with aging in comparison with the WT. The expression of TRPV2 in the WT group did not significantly change with aging.
Conclusions
TRPV2 functional deletion is compatible with aging and associated with a decreased development of myocyte hypertrophy and fibrosis. It may be an important target for prevention of age-induced cardiac remodeling.
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Acknowledgements
We thank Drs. Michael Tranter and A. Phillip Owens III for thoughtful discussions and scientific input. We gratefully acknowledge Michael Caterina, Ph.D., for providing the initial breeding pairs of TRPV2-FKO mice.
Funding
Research reported in this publication was supported in part by the American Heart Association (Beginning Grant in Aid 13BGIA17140069 to JR).
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Dr. Rubinstein is a founding member of TRP Therapeutics. He has not received any fees or honoraria from this venture.
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All animal procedures were performed with the approval of the Institutional Animal Care and Use Committee (IACUC) of the University of Cincinnati (Cincinnati, Ohio, USA).
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Jones, S., Mann, A., Worley, M.C. et al. The role of transient receptor potential vanilloid 2 channel in cardiac aging. Aging Clin Exp Res 29, 863–873 (2017). https://doi.org/10.1007/s40520-016-0663-x
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DOI: https://doi.org/10.1007/s40520-016-0663-x