Autologous preconditioned mesenchymal stem cell sheets improve left ventricular function in a rabbit old myocardial...

Area of Science:

• Cardiovascular Research
• Regenerative Medicine
• Stem Cell Therapy

Background:

• Mesenchymal stem cells (MSCs) show promise for treating infarcted hearts via therapeutic angiogenesis.
• Poor graft cell retention limits conventional MSC transplantation efficacy in ischemic conditions.
• Cell sheet technology improves cell retention in ischemic tissues.

Purpose of the Study:

• To investigate if hypoxic preconditioning enhances bone marrow-derived MSC (BM-MSC) sheet therapeutic functions.
• To assess the impact of autologous BM-MSC sheet implantation on cardiac function in rabbit myocardial infarction models.
• To determine if preconditioned BM-MSC sheets improve angiogenesis and cardiac function compared to standard sheets.

Main Methods:

• BM-MSC sheets were cultured under hypoxic conditions (2% O2) to assess vascular endothelial growth factor (VEGF) production.
• Autologous BM-MSC sheets, preconditioned or standardly cultured, were implanted into rabbit myocardial infarction models.
• Angiogenesis, infarct size, and left ventricular function were evaluated post-implantation.

Main Results:

• Hypoxic preconditioning increased VEGF production in BM-MSC sheets, peaking at 48 hours.
• Implantation of preconditioned BM-MSC sheets accelerated angiogenesis and reduced infarct size in rabbit hearts.
• Preconditioned BM-MSC sheets demonstrated superior therapeutic efficacy in improving left ventricular function compared to standard sheets.

Conclusions:

• Hypoxic preconditioning activates therapeutic functions of BM-MSC sheets.
• Autologous preconditioned BM-MSC sheet implantation is a feasible strategy for enhancing therapeutic angiogenesis in chronic myocardial infarction.
• This approach offers improved cardiac function recovery in infarcted hearts.