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Poly(Lactide-Co-Glycolide)-Monomethoxy-Poly-(Polyethylene Glycol) Nanoparticles Loaded with Melatonin Protect
Qiang Ma1, Junjie Yang1, Xu Huang1
1Department of Cardiology, Chinese PLA General Hospital, Beijing, People's Republic of China.
Melatonin nanoparticles enhance the survival of stem cells in heart attack models. This novel approach improves cell protection against oxidative stress and inflammation, offering a promising therapy for myocardial infarction.
Area of Science:
- Biomedical Engineering
- Regenerative Medicine
- Cardiovascular Research
Background:
- Stem cell transplantation shows promise for myocardial infarction (MI) but suffers from low transplanted cell survival.
- Oxidative stress and inflammation in the ischemic heart microenvironment significantly impair cell viability.
- Melatonin, a potent antioxidant, offers protection but lacks sustained efficacy.
Purpose of the Study:
- To investigate if encapsulating melatonin in poly(lactide-co-glycolide)-monomethoxy-poly-(polyethylene glycol) (PLGA-mPEG) nanoparticles (Mel-NPs) enhances its protective effects on adipose-derived mesenchymal stem cells (ADSCs).
- To evaluate the efficacy of Mel-NPs compared to free melatonin in protecting ADSCs against hypoxia/reoxygenation injury in vitro and improving cell survival and therapeutic outcomes in vivo in a rat MI model.
Main Methods:
- Construction of PLGA-mPEG nanoparticles to encapsulate melatonin.
- In vitro assessment of Mel-NPs' effects on ADSCs, including p53-cyclophilin D complex formation and mitochondrial permeability transition pore opening under hypoxia/reoxygenation.
- In vivo evaluation of Mel-NP-treated ADSC survival and therapeutic efficacy in a rat myocardial infarction model.
Main Results:
- Mel-NPs significantly reduced p53-cyclophilin D complex formation and prevented mitochondrial permeability transition pore opening in vitro.
- ADSCs treated with Mel-NPs exhibited higher survival rates compared to those treated with free melatonin in the myocardial infarction area.
- Pretreatment of ADSCs with Mel-NPs led to more apparent therapeutic effects in the rat MI model.
Conclusions:
- Melatonin-loaded PLGA-mPEG nanoparticles provide enhanced protection to ADSCs against oxidative stress and ischemic injury compared to free melatonin.
- Mel-NPs improve ADSC survival and therapeutic outcomes in myocardial infarction, suggesting a promising strategy for regenerative therapy.
- The combination of Mel-NPs with stem cell transplantation offers a potential advancement in treating myocardial infarction.
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