Key result
Prior bone marrow transplantation in mice significantly reduced post-MI adverse remodelling, infarct thinning, and contractile dysfunction compared to matched naive mice.
Why the study?
Does prior bone marrow transplantation improve cardiac recovery and reduce adverse remodeling after acute myocardial infarction in mice?
Does prior bone marrow transplantation improve cardiac recovery and reduce adverse remodeling after acute myocardial infarction in mice?
Prior bone marrow transplantation in mice alters tissue macrophage phenotype towards an M2 state, which enhances cardiac recovery and reduces adverse remodeling after subsequent acute myocardial infarction.
Supports macrophage modulation in post-MI recovery in mice; hypothesis-generating and should not yet change practice.
BACKGROUND: Bone marrow transplantation (BMT) is commonly used in experimental studies to investigate the contribution of BM-derived circulating cells to different disease processes. During studies investigating the cardiac response to acute myocardial infarction (MI) induced by permanent coronary ligation in mice that had previously undergone BMT, we found that BMT itself affects the remodelling response. METHODS AND RESULTS: Compared to matched naive mice, animals that had previously undergone BMT developed significantly less post-MI adverse remodelling, infarct thinning and contractile dysfunction as assessed by serial magnetic resonance imaging. Cardiac rupture in male mice was prevented. Histological analysis showed that the infarcts of mice that had undergone BMT had a significantly higher number of inflammatory cells, surviving cardiomyocytes and neovessels than control mice, as well as evidence of significant haemosiderin deposition. Flow cytometric and histological analyses demonstrated a higher number of alternatively activated (M2) macrophages in myocardium of the BMT group compared to control animals even before MI, and this increased further in the infarcts of the BMT mice after MI. CONCLUSIONS: The process of BMT itself substantially alters tissue macrophage phenotype and the subsequent response to acute MI. An increase in alternatively activated macrophages in this setting appears to enhance cardiac recovery after MI.
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Protti et al. (2015) studied Acute myocardial infarction. Bone marrow transplantation (BMT) vs. Matched naive mice was evaluated on Post-MI adverse remodelling, infarct thinning and contractile dysfunction. Prior bone marrow transplantation in mice significantly reduced post-MI adverse remodelling, infarct thinning, and contractile dysfunction compared to matched naive mice.
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