DHA Supplementation Attenuates MI-Induced LV Matrix Remodeling and Dysfunction in Mice
I Habicht1, G Mohsen2, L Eichhorn2
1Department of Orthopaedics and Trauma Surgery, University Hospital Bonn, Germany.
Oxidative Medicine and Cellular Longevity
|August 25, 2020
Summary
Docosahexaenoic acid (DHA) supplementation before myocardial infarction in mice reduced inflammation and improved heart function. This omega-3 fatty acid shows promise for protecting the heart against injury and promoting recovery.
Area of Science:
- Cardiovascular Research
- Molecular Biology
- Nutritional Science
Background:
- Myocardial ischemia-reperfusion (I/R) injury causes oxidative stress and inflammation, leading to heart damage.
- Marine omega-3 fatty acids, like docosahexaenoic acid (DHA), are known to offer cardioprotection.
Purpose of the Study:
- To investigate if DHA supplementation prior to LAD occlusion-induced myocardial injury (MI) in mice confers cardioprotection.
- To test the hypothesis that DHA mitigates I/R injury by modulating inflammatory pathways.
Main Methods:
- Mice received DHA or control diets before LAD occlusion-induced MI.
- Inflammatory mediator expression (RT-qPCR), macrophage infiltration (FACS, histology), collagen deposition, and cardiac function (pressure-volume catheter) were assessed.
Main Results:
- DHA attenuated PPAR-α induction and reduced inflammatory cytokine mRNA (TNF-α, IL-1β, IL-10) post-MI.
- DHA promoted an alternatively activated macrophage phenotype, correlating with reduced collagen deposition.
- Left ventricular ejection fraction was significantly improved in DHA-supplemented mice after 14 days.
Conclusions:
- DHA supplementation mediates cardioprotection against MI by modulating the inflammatory response and promoting timely cardiac remodeling.
- DHA may attenuate cardiomyocyte injury partly through transient PPAR-α downregulation and influencing macrophage polarization.
