Exosomal MiR-223-3p from Adipose-Derived Stem Cells Alleviates Hypoxia/Reoxygenation-Induced Ferroptosis of H9c2...

Area of Science:

• Cardiovascular Biology
• Stem Cell Biology
• Exosome Biology

Background:

• Myocardial ischemia-reperfusion injury (MI/RI) causes cardiac dysfunction.
• Stem cell-derived exosomes show therapeutic potential for MI/RI.
• The specific role of microRNA-223-3p (miR-223-3p) in adipose-derived stem cell exosomes (ADSC-Exo) for MI/RI is not fully understood.

Purpose of the Study:

• To investigate the effects of exosomal miR-223-3p from ADSCs on hypoxia/reoxygenation (H/R)-induced H9c2 cell injury.
• To determine the underlying mechanism involving transferrin receptor (TFRC).

Main Methods:

• Characterization of ADSC-Exo (morphology, size, surface markers CD9/CD63).
• Assessment of H9c2 cell viability, proliferation, apoptosis, reactive oxygen species (ROS), glutathione (GSH), malondialdehyde (MDA), and Fe2+ levels.
• Manipulation of miR-223-3p and TFRC expression in ADSC-Exo and H9c2 cells.
• Bioinformatic analysis and experimental validation of miR-223-3p targeting TFRC.

Main Results:

• ADSC-Exo enhanced H9c2 cell viability, proliferation, GSH, GPX4, and miR-223-3p levels, while reducing apoptosis, ROS, MDA, Fe2+, ACSL4, and TFRC.
• Overexpression of exosomal miR-223-3p from ADSCs amplified these protective effects.
• Overexpression of TFRC in H9c2 cells reversed the benefits of miR-223-3p overexpressing ADSC-Exo.
• miR-223-3p was confirmed to directly target and downregulate TFRC.

Conclusions:

• Exosomal miR-223-3p derived from ADSCs mitigates H/R-induced ferroptosis in H9c2 cells.
• This protective effect is mediated by the inhibition of TFRC.
• Exosomal miR-223-3p targeting TFRC presents a novel therapeutic strategy for MI/RI.