Enriched environment promotes post-stroke angiogenesis through astrocytic interleukin-17A.

Area of Science:

• Neuroscience
• Regenerative Medicine
• Stroke Research

Background:

• Previous studies suggest enriched environments (EE) aid stroke recovery via astrocyte proliferation and angiogenesis.
• The precise role of astrocytes in EE-mediated angiogenesis following cerebral ischemia/reperfusion (I/R) injury requires further elucidation.

Purpose of the Study:

• To investigate the neuroprotective effects of EE on angiogenesis in an astrocytic interleukin-17A (IL-17A)-dependent manner after cerebral I/R injury.

Main Methods:

• Established a rat model of ischemic stroke using middle cerebral artery occlusion (MCAO).
• Assessed functional recovery using behavioral tests (mNSS, rotarod) and infarct volume (TTC staining).
• Quantified angiogenesis markers (CD34, VEGF) and IL-17A, IL-6, JAK2, STAT3 expression via immunofluorescence, western blotting, and RT-qPCR.

Main Results:

• EE significantly improved functional recovery, reduced infarct volume, and enhanced angiogenesis compared to standard conditions.
• EE increased IL-17A expression in astrocytes and upregulated angiogenesis markers (CD34, VEGF, IL-6, JAK2, STAT3) in the penumbra.
• Neutralizing IL-17A in EE rats abolished the beneficial effects on functional recovery and angiogenesis.

Conclusions:

• Astrocytic IL-17A plays a crucial role in EE-mediated angiogenesis and functional recovery post-I/R injury.
• This study provides a potential neuroprotective mechanism for EE in stroke recovery.
• Findings may inform clinical applications of EE for stroke patients and guide future research on IL-17A's role in neural repair.