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Related Concept Videos

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Myocarditis is an inflammation of the heart muscle. The symptoms vary widely, encompassing asymptomatic presentations to severe, acute manifestations.Clinical PresentationAsymptomatic cases: In some instances, myocarditis may be asymptomatic, with the infection resolving without intervention. These cases often go undetected unless discovered incidentally through diagnostic imaging or tests conducted for other reasons.General Early Symptoms: Early symptoms of myocarditis are non-specific and can...
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Related Experiment Video

Updated: Apr 16, 2026

Left Coronary Artery Ligation: A Surgical Murine Model of Myocardial Infarction
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Monocytes in myocardial infarction.

Partha Dutta1, Matthias Nahrendorf2

  • 1From the Center for Systems Biology, Massachusetts General Hospital and Harvard Medical School, Boston. Dutta.Partha@mgh.harvard.edu.

Arteriosclerosis, Thrombosis, and Vascular Biology
|March 21, 2015
PubMed
Summary
This summary is machine-generated.

Understanding monocyte roles in heart attack repair is key. New therapies targeting monocyte signals after myocardial infarction (MI) could improve cardiac healing and reduce heart failure risk.

Keywords:
hematopoiesismacrophagesmonocytesmyocardial infarction

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Area of Science:

  • Cardiovascular Science
  • Immunology
  • Regenerative Medicine

Background:

  • Myocardial infarction (MI) remains a leading cause of death, with high long-term morbidity despite revascularization.
  • The post-MI period involves rapid tissue turnover, including extracellular matrix digestion and fibrosis, making repair critical.
  • Monocytes are essential for debris removal and repair in the infarcted myocardium, but excessive inflammation can hinder healing.

Purpose of the Study:

  • To elucidate the roles and regulation of monocyte subsets during myocardial infarction (MI) repair.
  • To identify therapeutic targets for improving cardiac healing and mitigating heart failure post-MI.

Main Methods:

  • The study focuses on the two-phase recruitment of monocytes (Ly-6c(high) and Ly-6c(low)) to the infarcted myocardium post-MI.
  • Analysis of monocyte differentiation pathways, specifically Ly-6c(high) to Ly-6c(low) macrophages, during later healing stages.

Main Results:

  • Monocyte recruitment to the infarcted myocardium occurs in two distinct phases, initially dominated by Ly-6c(high) monocytes.
  • Ly-6c(low) monocyte recruitment is less pronounced, though Ly-6c(high) monocytes can differentiate into Ly-6c(low) macrophages.
  • Elevated white blood cell counts correlate with increased in-hospital mortality after MI, suggesting a role for inflammation control.

Conclusions:

  • Understanding the signals that regulate monocyte numbers and function after MI is crucial for developing novel therapeutic strategies.
  • Targeting monocyte responses holds promise for enhancing cardiac repair and reducing the incidence of heart failure following myocardial infarction.