Bone marrow-derived mesenchymal stem cells-derived exosomes prevent oligodendrocyte apoptosis through exosomal...

Area of Science:

• Neuroscience
• Cell Biology
• Regenerative Medicine

Background:

• Ischemic stroke leads to significant brain damage and is a major global health concern.
• MicroRNA-134 (miR-134) plays a role in neural ischemia injury, but its specific function in ischemic stroke is not fully understood.
• Oligodendrocytes (OLs) are crucial for brain function and are vulnerable to ischemic injury.

Purpose of the Study:

• To investigate the impact of exosomal miR-134 from bone marrow-derived mesenchymal stem cells (BMSCs) on oligodendrocyte apoptosis.
• To elucidate the underlying molecular mechanisms by which exosomal miR-134 affects OLs during ischemic conditions.

Main Methods:

• Oxygen-glucose deprivation (OGD) model was used to simulate ischemic conditions in cultured rat OLs.
• BMSCs-derived exosomes were isolated and characterized.
• miR-134 mimics and inhibitors were employed to modulate miR-134 levels in OLs.
• Caspase-8 expression and activity were assessed.
• Caspase-8 knockdown was performed using small interfering RNA (siRNA).

Main Results:

• OGD treatment decreased miR-134 levels and increased caspase-8 in BMSCs-exosomes and OLs.
• Exosomal miR-134 significantly inhibited OL apoptosis by reducing caspase-8 expression and activity in OGD-treated OLs.
• miR-134 mimics decreased caspase-8, while inhibitors exacerbated OGD-induced caspase-8 changes.
• Caspase-8 knockdown reversed the anti-apoptotic effects of miR-134 inhibition.

Conclusions:

• BMSCs-derived exosomes suppress OL apoptosis via exosomal miR-134.
• The mechanism involves the negative regulation of the caspase-8-dependent apoptosis pathway.
• Exosomal miR-134 represents a potential therapeutic target for ischemic stroke treatment.