MCP-1-mediated activation of microglia promotes white matter lesions and cognitive deficits by chronic cerebral...

Area of Science:

• Neuroscience
• Cerebrovascular Biology
• Neuroinflammation

Background:

• Microglia activation is implicated in white matter lesions (WMLs) resulting from chronic cerebral hypoperfusion.
• Hypoxia upregulates Monocyte Chemoattractant Protein-1 (MCP-1), a known promoter of microglia activation.
• The specific role of MCP-1 in microglia activation during chronic cerebral ischemia remains unclear.

Purpose of the Study:

• To investigate the role of MCP-1-mediated microglia activation in the pathogenesis of white matter lesions under chronic cerebral hypoperfusion.
• To elucidate the involvement of the p38MAPK/PKC signaling pathway in this process.
• To assess the impact on working memory in a mouse model.

Main Methods:

• Establishment of a chronic cerebral hypoperfusion mouse model via permanent stenosis of bilateral common carotid arteries.
• Assessment of microglia activation in white matter.
• Analysis of the p38MAPK/PKC signaling pathway activation.
• Evaluation of working memory performance.

Main Results:

• Stenosis of common carotid arteries induced significant white matter lesions.
• MCP-1-mediated microglia activation was observed, correlating with white matter damage.
• Activation of the p38MAPK/PKC signaling pathway was identified as a key mediator in this process.

Conclusions:

• Chronic cerebral hypoperfusion triggers MCP-1-mediated microglia activation through the p38MAPK/PKC pathway, leading to white matter lesions.
• This study uncovers a novel mechanism involving MCP-1 in microglia activation relevant to cerebral ischemia.
• The findings suggest a potential therapeutic strategy targeting MCP-1 for treating chronic cerebral hypoperfusion.