Chemokine-driven inflammation plays an important role in the reparative response following myocardial infarction and is critically involved in the pathogenesis of adverse remodeling. Differential expression of chemokine receptors by monocyte and lymphocyte subsets governs their trafficking in the infarcted myocardium resulting in infiltration with subpopulations that exhibit distinct functional properties. We propose that beyond their involvement in initiation and activation of the post-infarction inflammatory reaction, chemokine-mediated interactions also play an important role in suppression of inflammation through recruitment of leukocyte subsets with inhibitory properties. Our studies suggest that signaling through the CC chemokine receptor 5 (CCR5) mediates recruitment of suppressive monocyte subsets and regulatory T cells (Tregs), a CD4+ T lymphocyte subpopulation with an essential role in regulation of immune responses. Accordingly, the objective of the current proposal is to investigate the role of Tregs and inhibitory monocyte subpopulations in regulation of post-infarction inflammation, to study the molecular signals responsible for their protective effects, and to explore the role of chemokine signaling in their recruitment in the infarcted myocardium. These concepts will be examined in three specific aims:
Specific aim 1 : to investigate the role of monocyte subsets with anti-inflammatory properties in controlling the post-infarction inflammatory response.
Specific aim 2 : to study the involvement of Tregs in inhibition of inflammatory injury, in prevention of excessive matrix degradation and in protection from the development of adverse remodeling following myocardial infarction.
Specific aim 3 : to investigate chemokine/chemokine receptor interactions responsible for recruitment of Tregs and effector T cells in the infarcted myocardium. Chemokine-mediated suppression of inflammation through recruitment of regulatory mononuclear cell subpopulations appears to play an essential role in cardiac repair and protects from the development of adverse remodeling. Understanding the effects of inhibitory monocytes and Tregs may identify novel therapeutic targets for pharmacologic interventions and cell therapy in patients with myocardial infarction.

Public Health Relevance

The proposed project explores the role of monocyte subsets and regulatory T cells in preventing uncontrolled inflammation and excessive injury in myocardial infarction. Chemokine-mediated interactions responsible for recruitment of suppressive mononuclear cell subpopulations may play an essential protective role in the pathogenesis of adverse cardiac remodeling. The findings may identify novel therapeutic targets for pharmacologic interventions and cell therapy in patients with acute myocardial infarction.

Agency
National Institute of Health (NIH)
Institute
National Heart, Lung, and Blood Institute (NHLBI)
Type
Research Project (R01)
Project #
5R01HL076246-08
Application #
8220898
Study Section
Myocardial Ischemia and Metabolism Study Section (MIM)
Program Officer
Schwartz, Lisa
Project Start
2004-04-01
Project End
2015-02-28
Budget Start
2012-03-01
Budget End
2013-02-28
Support Year
8
Fiscal Year
2012
Total Cost
$415,000
Indirect Cost
$165,000
Name
Albert Einstein College of Medicine
Department
Internal Medicine/Medicine
Type
Schools of Medicine
DUNS #
110521739
City
Bronx
State
NY
Country
United States
Zip Code
10461
Chen, Bijun; Frangogiannis, Nikolaos G (2018) The Role of Macrophages in Nonischemic Heart Failure. JACC Basic Transl Sci 3:245-248
Kirk, Jonathan A; Frangogiannis, Nikolaos G (2018) Galectin-3 in the pathogenesis of heart failure: a causative mediator or simply a biomarker? Am J Physiol Heart Circ Physiol 314:H1256-H1258
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Frangogiannis, Nikolaos G (2018) Cell biological mechanisms in regulation of the post-infarction inflammatory response. Curr Opin Physiol 1:7-13
Huang, Shuaibo; Frangogiannis, Nikolaos G (2018) Anti-inflammatory therapies in myocardial infarction: failures, hopes and challenges. Br J Pharmacol 175:1377-1400
Alex, Linda; Frangogiannis, Nikolaos G (2018) The Cellular Origin of Activated Fibroblasts in the Infarcted and Remodeling Myocardium. Circ Res 122:540-542
Frangogiannis, Nikolaos G (2018) Cell therapy for peripheral artery disease. Curr Opin Pharmacol 39:27-34
Kong, Ping; Shinde, Arti V; Su, Ya et al. (2018) Opposing Actions of Fibroblast and Cardiomyocyte Smad3 Signaling in the Infarcted Myocardium. Circulation 137:707-724
Chen, Bijun; Frangogiannis, Nikolaos G (2017) Immune cells in repair of the infarcted myocardium. Microcirculation 24:
Shinde, Arti V; Frangogiannis, Nikolaos G (2017) Mechanisms of Fibroblast Activation in the Remodeling Myocardium. Curr Pathobiol Rep 5:145-152

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