miR-181b promotes angiogenesis and neurological function recovery after ischemic stroke

Area of Science:

• Neuroscience
• Molecular Biology
• Cardiovascular Research

Background:

• New blood vessel formation (angiogenesis) is a therapeutic strategy for ischemic stroke.
• Non-coding microRNAs (miRNAs) are emerging as potential therapeutic targets for stroke.
• The role of miR-181b in ischemic stroke-induced angiogenesis was previously unknown.

Purpose of the Study:

• To investigate the therapeutic potential of miR-181b in ischemic stroke.
• To elucidate the molecular mechanism underlying miR-181b's effect on angiogenesis in stroke.

Main Methods:

• Overexpression of miR-181b in brain microvascular endothelial cells under oxygen-glucose deprivation.
• In vivo studies using rat models of focal cerebral ischemia.
• Analysis of the PTEN/Akt signaling pathway and related gene expression.

Main Results:

• miR-181b overexpression restored endothelial cell proliferation and enhanced angiogenesis in vitro.
• In vivo, miR-181b reduced infarct volume, promoted angiogenesis in the ischemic penumbra, and improved neurological function.
• miR-181b directly targeted PTEN mRNA, downregulating PTEN and activating the Akt pathway, leading to increased vascular endothelial growth factors and decreased endostatin.

Conclusions:

• Exogenous miR-181b demonstrates neuroprotective effects in ischemic stroke.
• miR-181b promotes angiogenesis by activating the PTEN/Akt signaling pathway.
• miR-181b represents a promising therapeutic target for ischemic stroke treatment.