Myocardial infarction (MI) resulting in the loss of fully functional myocardium is the major cause (50-70%) of heart failure (HF), which continues to be a major health problem in the U.S. Unfavourable post-MI healing and extended MI size lead to detrimental cardiac remodeling that prone the damage heart to transition to HF. At this stage, there are no clinical therapies available to halt this downhill course with the aim to promote myocardial regeneration and limit MI size. This proposal, accordingly, has direct health relevance as it will characterize and test a novel therapeutic principle and target, respectively, to favourably modulate post-MI inflammation and regeneration with the ultimate goal of translating our findings clinically. In our previous work, we have extensively characterized the intracellular role of S100A1 in cardiomyocytes as a critical regulator of calcium (Ca2+) cycling exerting a non-detrimental positive inotropic effect in normal hearts and protect and rescue injured hearts from post-MI HF. Here, we propose a novel extracellular role for S100A1 when released by ischemic myocardium to act as a local and systemic signal of cardiac damage both favourably modulating cardiac healing and promoting cardiac tissue regeneration through a unique interaction with the bone marrow (BM). Taking advantage of genetically manipulated mouse models with different cardiac S100A1 expression levels and complementary biochemical strategies to specifically neutralize and supplement MI-released extracellular S100A1, we will determine the impact of damage-released S100A1 on post-MI healing and regeneration and test the therapeutic effect of exogenous S100A1. The Central Hypothesis of this proposal is that cardiomyocyte-released S100A1 protein acts as an endogenous signaling molecule that triggers a favourable inflammatory response in the infarcted heart and improves cardiac regeneration post-MI through recruitment of BM stem cells.
The specific aims are:
Aim 1 : To determine the local role of cardiomyocyte- released S100A1 to modulate the inflammatory response of the infarcted heart in vivo and the underlying molecular mechanisms and signaling pathways in cardiac S100A1 target cells ex vivo.
Aim 2 : To determine the systemic role of cardiomyocyte-released S100A1 to modulate bone marrow contribution to the regeneration of the infarcted heart in vivo and characterize the underlying molecular mechanisms and signaling cascades in extra-cardiac S100A1 target cells ex vivo.
Aim 3 : To examine the therapeutic role of exogenous S100A1 as a target to modulate cardiac healing, regeneration and subsequent remodeling after myocardial infarction in vivo.

Public Health Relevance

stems from our major aim to characterize and test a novel therapeutic cardiac target to improve healing and regeneration after myocardial infaction, which is the major reason for heart failure (HF) in the U.S. At this stage, there is no clinical therapy available to promote cardiac regeneration to prevent HF.

National Institute of Health (NIH)
National Heart, Lung, and Blood Institute (NHLBI)
Research Project (R01)
Project #
Application #
Study Section
Myocardial Ischemia and Metabolism Study Section (MIM)
Program Officer
Schwartz, Lisa
Project Start
Project End
Budget Start
Budget End
Support Year
Fiscal Year
Total Cost
Indirect Cost
Thomas Jefferson University
Internal Medicine/Medicine
Schools of Medicine
United States
Zip Code
Pleger, Sven T; Raake, Philip; Katus, Hugo A et al. (2014) Cardiac calcium handling on trial: targeting the failing cardiomyocyte signalosome. Circ Res 114:12-4
Sen, Anagha; Most, Patrick; Peppel, Karsten (2014) Induction of microRNA-138 by pro-inflammatory cytokines causes endothelial cell dysfunction. FEBS Lett 588:906-14
Friedrich, Oliver; Yi, Bing; Edwards, Joshua N et al. (2014) IL-1? reversibly inhibits skeletal muscle ryanodine receptor. a novel mechanism for critical illness myopathy? Am J Respir Cell Mol Biol 50:1096-106
Weber, C; Neacsu, I; Krautz, B et al. (2014) Therapeutic safety of high myocardial expression levels of the molecular inotrope S100A1 in a preclinical heart failure model. Gene Ther 21:131-8
Rohde, David; Schön, Christoph; Boerries, Melanie et al. (2014) S100A1 is released from ischemic cardiomyocytes and signals myocardial damage via Toll-like receptor 4. EMBO Mol Med 6:778-94
Most, Patrick; Raake, Philip; Weber, Christophe et al. (2013) S100A1 gene therapy in small and large animals. Methods Mol Biol 963:407-20
Pleger, Sven T; Brinks, Henriette; Ritterhoff, Julia et al. (2013) Heart failure gene therapy: the path to clinical practice. Circ Res 113:792-809
Most, Patrick; Lerchenmuller, Carolin; Rengo, Giuseppe et al. (2013) S100A1 deficiency impairs postischemic angiogenesis via compromised proangiogenic endothelial cell function and nitric oxide synthase regulation. Circ Res 112:66-78
Ritterhoff, J; Most, P (2012) Targeting S100A1 in heart failure. Gene Ther 19:613-21
Volkers, Mirko; Dolatabadi, Nima; Gude, Natalie et al. (2012) Orai1 deficiency leads to heart failure and skeletal myopathy in zebrafish. J Cell Sci 125:287-94

Showing the most recent 10 out of 21 publications