Related Experiment Video
Updated: Nov 25, 2025
07:23
Improved Rodent Model of Myocardial Ischemia and Reperfusion Injury
Published on: March 7, 2022
6.7K
Eosinophils improve cardiac function after myocardial infarction
Jing Liu1,2, Chongzhe Yang1, Tianxiao Liu1,2
1Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, 02115, USA.
Nature Communications
|December 17, 2020
Summary
Eosinophils protect the heart after myocardial infarction (MI). Depleting these cells worsens cardiac dysfunction, but their presence and specific proteins like mEar1 prevent cell death and inflammation, establishing a cardioprotective role.
Area of Science:
- Cardiology
- Immunology
- Cell Biology
Background:
- Eosinophil counts and cationic proteins are implicated in coronary heart disease risk.
- Changes in eosinophil levels post-myocardial infarction (MI) require further investigation.
Purpose of the Study:
- To investigate the role of eosinophils in cardiac dysfunction and repair following myocardial infarction (MI).
- To elucidate the mechanisms by which eosinophils exert their effects in the post-MI heart.
Main Methods:
- Analyzing blood and heart eosinophil counts in humans and mice post-MI.
- Utilizing genetic and inducible eosinophil depletion models (∆dblGATA mice).
- Performing in vitro studies on cardiomyocyte death, fibroblast activation, and neutrophil adhesion.
Main Results:
- Eosinophil depletion exacerbated cardiac dysfunction, cell death, and fibrosis post-MI.
- Eosinophils, via IL4 and mEar1, protected cardiomyocytes from death and inhibited fibroblast activation and neutrophil adhesion.
- In vitro eosinophils and recombinant mEar1 protein corrected cardiac dysfunction in deficient mice.
Conclusions:
- Eosinophils play a crucial cardioprotective role in the heart after myocardial infarction.
- Eosinophil-derived IL4 and mEar1 are key mediators of this protective effect.
- Targeting eosinophils may offer novel therapeutic strategies for post-MI recovery.
Related Concept Videos
01:14Myocarditis III: Medical Management
80
Myocarditis: Comprehensive Medical ManagementMyocarditis, the heart muscle inflammation, requires a comprehensive medical management strategy that addresses the underlying cause, provides supportive care, manages symptoms, and reduces cardiac workload.Infections and Autoimmune CausesAdminister appropriate antimicrobial therapy when an infectious agent causes myocarditis. For instance, penicillin treats infections caused by Group A Streptococcus. In cases where autoimmune processes are...
80
01:21Myocarditis I: Introduction
178
Myocarditis is inflammation of the myocardium, which is the muscular layer of the heart.EtiologyMyocarditis has a diverse etiology, including a wide range of infectious and non-infectious causes:Infectious CausesViral: Common viruses include Coxsackie A and B, adenovirus, parvovirus B19, enteroviruses, and influenza A.Bacterial: Examples include infections caused by Streptococcus, Staphylococcus, and Mycoplasma species.Rickettsial: Infections like Rocky Mountain spotted fever can result in...
178
01:26Heart Failure Drugs: Inotropic Agents
944
Positive inotropic agents are commonly used as the first line of treatment for heart failure. One such agent is digoxin, derived from the genus Digitalis, which has been known for centuries but effectively utilized since 1785. However, these cardiac glycosides can have potentially toxic effects due to their mechanism of action, which involves inhibiting Na+/K+-ATPase and increasing contractility. Digoxin is absorbed orally and distributed in various tissues, including the CNS. It has a long...
944
01:29Cardiomyopathy V: Interprofessional Care
128
Managing cardiomyopathy involves addressing underlying or precipitating causes, treating heart failure with medications, and implementing dietary changes and a balanced exercise and rest regimen.Lifestyle ModificationsCardiomyopathy patients should adopt a low-sodium diet to reduce fluid retention and manage heart failure. A personalized exercise and rest plan helps maintain physical fitness without overstraining the heart. Avoiding alcohol and tobacco is essential to prevent further damage to...
128
01:26Heart Failure Drugs: Inhibitors of Renin-Angiotensin System
680
The activation of the sympathetic nervous system and the renin-angiotensin-aldosterone system (RAAS) contributes to cardiac remodeling, and inhibiting the RAAS is a pharmacological target in heart failure management. As a result, neurohumoral modulation is a crucial treatment principle for managing heart failure. This approach involves using medications like ACE inhibitors (ACEIs), angiotensin receptor blockers (ARBs), β-blockers, mineralocorticoid receptor antagonists (MRAs), and neutral...
680
01:17Exercise and Cardiac Output
1.6K
Regular physical activity is essential for maintaining cardiovascular health, with aerobic exercises being particularly effective. According to the American Heart Association, 150 minutes of moderate to intense aerobic exercise per week is recommended for a healthy heart. Aerobic activities may include brisk walking, running, bicycling, cross-country skiing, and swimming, ideally performed three to five times per week.
Sustained exercise increases the muscles' oxygen demand, which can be...
Sustained exercise increases the muscles' oxygen demand, which can be...
1.6K