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Cardiac microvascular functions improved by MSC-derived exosomes attenuate cardiac fibrosis after
Xueqing Wang1, Long Bai2, Xinxin Liu1
1Department of Cardiology, 2nd Affiliated Hospital of Harbin Medical University, Harbin 150001, China; Key Laboratory of Myocardial Ischemia, Ministry of Education, Harbin Medical University, Harbin 150001, China.
Abstract:
Microvascular dysfunction caused by cardiac ischemia-reperfusion (I/R) leads to multiple severe cardiac adverse events, such as heart failure and ventricular modeling, which plays a critical role in outcomes. Though marrow mesenchymal stem cell (MSC) therapy has been proven effective for attenuating I/R injury, the limitations of clinical feasibility cannot be ignored. Since exosomes are recognized as the main vehicles for MSCs paracrine effects, we assumed that MSC-derived exosomes could prevent microvascular dysfunction and further protect cardiac function. By establishing a rat cardiac I/R model in vivo and a cardiac microvascular endothelial cells (CMECs) hypoxia-reperfusion (H/R) model in vitro, we demonstrated that MSC-derived exosomes enhanced microvascular regeneration under stress, inhibited fibrosis development, and eventually improved cardiac function through platelet-derived growth factor receptor-β (PDGFR-β) modulation. Furthermore, we found that MSC-derived exosomes possessed better therapeutic effects than MSCs themselves.
Insights
Mesenchymal stem cell-derived exosomes protect cardiac function by preventing microvascular dysfunction after ischemia-reperfusion injury. These exosomes show superior therapeutic potential compared to the stem cells themselves.
Area of Science:
- Cardiovascular Biology
- Regenerative Medicine
- Cellular Therapeutics
Background:
- Cardiac ischemia-reperfusion (I/R) injury causes microvascular dysfunction, leading to adverse cardiac events like heart failure.
- Marrow mesenchymal stem cell (MSC) therapy shows promise for I/R injury but faces clinical feasibility challenges.
- Exosomes mediate MSCs' paracrine effects, suggesting their therapeutic potential.
Purpose of the Study:
- To investigate the efficacy of MSC-derived exosomes in preventing cardiac microvascular dysfunction and protecting cardiac function post-I/R.
- To elucidate the underlying mechanisms, including microvascular regeneration, fibrosis inhibition, and growth factor modulation.
Main Methods:
- Established rat cardiac I/R and cardiac microvascular endothelial cells (CMECs) hypoxia-reperfusion (H/R) models.
- Administered MSC-derived exosomes in vivo and in vitro.
- Assessed microvascular regeneration, fibrosis, cardiac function, and platelet-derived growth factor receptor-β (PDGFR-β) signaling.
Main Results:
- MSC-derived exosomes enhanced microvascular regeneration under stress conditions.
- Exosome treatment inhibited fibrosis development in the cardiac tissue.
- MSC-derived exosomes demonstrated superior protective effects on cardiac function compared to MSCs.
- PDGFR-β modulation was identified as a key mechanism.
Conclusions:
- MSC-derived exosomes effectively protect against cardiac I/R injury by preserving microvascular integrity and function.
- Exosomes represent a promising cell-free therapeutic strategy for cardiac I/R injury with enhanced efficacy over MSCs.
- Targeting PDGFR-β signaling is crucial for the cardioprotective effects of MSC-derived exosomes.
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