The realization that the heart is a regenerative organ has spurred renewed interest in the possibilities for antagonizing the aging of the myocardium through enhanced repair. However, deterioration of myocardial function over our lifespan stems from combinatorial effects of diminished regenerative capabilities together with increasing accumulation of senescent cells with marginal functional performance. Thus, the optimal interventional strategy to antagonize aging of the heart would need to promote maintenance of youthful characteristics typified by a robust stem cell population and minimal accrual of senescent cells. This proposal will antagonize the aging phenotype through a molecular strategy involving Pim-1, a survival and proliferative kinase recently identified in the myocardium. Judicious enhancement of Pim-1 activity will antagonize senescence of stem cell and cardiomyocyte populations, conferring upon the heart a more youthful phenotype capable of greater hemodynamic function and resistance to cardiomyopathic injury including the degenerative consequences of aging. Accomplishing the stated aims of the proposal will provide a comprehensive mechanistic understanding of improvements mediated by myocardial Pim-1 activity. The innovation of this proposal rests with the unique nature of Pim-1 kinase as a targeted strategy to antagonize the aging phenotype and prolong the functional lifespan of cardiomyocytes as well as cardiac progenitor cells responsible for repair and regeneration. The short term goal is to delineate the aging-associated targets influenced by Pim-1 and demonstrate the efficacy of Pim-1 interventional approaches to retard the aging process.
Specific aims are: 1) Myocardial senescence is antagonized by Pim-1 mediated signaling, 2) Loss of Pim-1 activity leads to premature aging of the myocardium and associated decline in hemodynamic performance, and 3) the proliferative phase of cardiac progenitor cell and young cardiomyocyte expansion is extended by Pim-1 kinase. The significance of these studies is the inhibition of myocardial aging and maintenance of youthful characteristics for a longer period of lifespan. Collectively, these studies will set the stage for interventional approaches to regulate Pim-1 kinase activity in service of antagonizing senescence and promoting stem cell-mediated regeneration.

Public Health Relevance

Heart disease remains a major cause or morbidity and mortality in the United States, with long term care and hospitalization of patients a significant burden on the national health care system. Despite advances over the last several decades we are still not truly capable of addressing the fundamental issue in heart failure: the progressive loss of contractile function and viable tissue. This proposal focuses upon a novel fundamental molecular mechanism involving antagonizing the aging phenotype to maintain cardiac structure and function resulting in extended quality of life and decreased medical cost.

National Institute of Health (NIH)
National Heart, Lung, and Blood Institute (NHLBI)
Research Project (R01)
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Cardiac Contractility, Hypertrophy, and Failure Study Section (CCHF)
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Wong, Renee P
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San Diego State University
Schools of Arts and Sciences
San Diego
United States
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Monsanto, Megan M; Wang, Bingyan J; Sussman, Mark A (2017) Synthetic MSC? Nothing Beats the Real Thing. Circ Res 120:1694-1695
Khalafalla, Farid G; Greene, Steven; Khan, Hashim et al. (2017) P2Y2 Nucleotide Receptor Prompts Human Cardiac Progenitor Cell Activation by Modulating Hippo Signaling. Circ Res 121:1224-1236
Kubli, Dieter A; Sussman, Mark A (2017) Eat, breathe, ROS: controlling stem cell fate through metabolism. Expert Rev Cardiovasc Ther 15:345-356
Monsanto, Megan M; White, Kevin S; Kim, Taeyong et al. (2017) Concurrent Isolation of 3 Distinct Cardiac Stem Cell Populations From a Single Human Heart Biopsy. Circ Res 121:113-124
Sussman, Mark A (2017) A Matter of Opinion. Circ Res 120:36-38
Eschenhagen, Thomas; Bolli, Roberto; Braun, Thomas et al. (2017) Cardiomyocyte Regeneration: A Consensus Statement. Circulation 136:680-686
Samse, Kaitlen; Hariharan, Nirmala; Sussman, Mark A (2016) Personalizing cardiac regenerative therapy: At the heart of Pim1 kinase. Pharmacol Res 103:13-6
Doroudgar, Shirin; Quijada, Pearl; Konstandin, Mathias et al. (2016) S100A4 protects the myocardium against ischemic stress. J Mol Cell Cardiol 100:54-63
Kulandavelu, Shathiyah; Karantalis, Vasileios; Fritsch, Julia et al. (2016) Pim1 Kinase Overexpression Enhances ckit+ Cardiac Stem Cell Cardiac Repair Following Myocardial Infarction in Swine. J Am Coll Cardiol 68:2454-2464
Broughton, Kathleen M; Sussman, Mark A (2016) Empowering Adult Stem Cells for Myocardial Regeneration V2.0: Success in Small Steps. Circ Res 118:867-80

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