Pericytes Regulate Cerebral Perfusion through VEGFR1 in Ischemic Stroke

Area of Science:

• Neuroscience
• Vascular Biology
• Stroke Research

Background:

• Neurons in the ischemic penumbra can be rescued by restoring blood flow.
• Post-stroke angiogenesis is a potential therapeutic strategy for reducing ischemic damage.
• Mechanisms of brain neovasculature formation and current therapies for brain ischemia are suboptimal.

Purpose of the Study:

• To investigate the role of VEGFR1 in pericytes following stroke.
• To elucidate the mechanism of pericyte-derived VEGFR1 in angiogenesis and vascular integrity after ischemic stroke.

Main Methods:

• Stroke induction in animal models.
• VEGFR1 knockdown in pericytes.
• In vitro studies on endothelial tube formation and pericyte migration.
• Analysis of Akt activity in endothelial cells and pericytes.

Main Results:

• VEGFR1 was significantly upregulated in pericytes post-stroke.
• Knockdown of VEGFR1 in pericytes increased infarct size and impaired vessel formation.
• Pericyte-derived VEGFR1 is critical for endothelial tube formation and pericyte migration.
• Pericyte-derived VEGFR1 exhibited opposing effects on Akt activity in endothelial cells and pericytes.

Conclusions:

• Pericyte-specific VEGFR1 plays a key role in modulating ischemia-induced vessel formation and vascular integrity in the brain.
• Targeting pericyte VEGFR1 may offer a novel therapeutic approach for stroke recovery.