Mesenchymal stem cell derived extracellular vesicles reverses neural aging via OSKM modulation

Area of Science:

• Regenerative Medicine
• Neuroscience
• Aging Research

Background:

• Human placenta-derived mesenchymal stem cells (hpMSCs) show therapeutic potential via secreted factors and extracellular vesicles (EVs).
• EVs facilitate genetic regulation for tissue repair, but their impact on normal aging remains unexplored.
• Systemic administration of hpMSCs and their derivatives offers a novel therapeutic avenue.

Purpose of the Study:

• To investigate the effects of systemically injected hpMSCs and their derived EVs on neural aging in mice.
• To elucidate the molecular mechanisms underlying hpMSC-mediated rejuvenation of aging neural pathways.

Main Methods:

• Aged female mice received intravenous infusions of hpMSCs or PBS.
• Extracellular vesicles were isolated from hpMSC culture media using size exclusion chromatography.
• RNA sequencing was performed on hippocampal tissues to analyze gene expression changes.

Main Results:

• hpMSCs modulated aging-related neural pathways, downregulating age-specific genes in the hippocampus.
• MicroRNAs (miRNAs) within hpMSC-derived EVs were found to reactivate senescent cells.
• Reactivation involves Toll-like receptor 4 (TLR4) inhibition and increased OSKM (OCT4, SOX2, KLF4, C-MYC) transcription factors, particularly SOX2.

Conclusions:

• hpMSC-derived EVs contain miRNAs capable of stimulating OSKM transcription factors.
• This study pioneers the use of EV-derived miRNAs for neural rejuvenation in aging.
• Represents a significant advancement in regenerative medicine for addressing neural aging.