Microglial Plasticity in Vascular Dementia: Mechanisms and Therapeutic Reprogramming.

Area of Science:

• Neuroscience
• Immunology
• Pathology

Background:

• Vascular dementia (VaD) is a major cause of cognitive decline.
• It stems from cerebrovascular issues like small vessel disease and hypoperfusion.
• Microglia play a dual role, initially protective, then detrimental in VaD.

Purpose of the Study:

• To explore molecular pathways governing microglial function in VaD.
• To identify epigenetic regulators, like microRNAs, impacting microglial phenotypes.
• To establish a framework for reprogramming microglia for therapeutic benefit.

Main Methods:

• Review of emerging evidence on molecular and epigenetic regulation of microglia.
• Analysis of pathways including purinergic receptors, TLRs, inflammasomes, complement, TREM2, and CSF1R.
• Examination of microRNA-mediated regulation (miR-30, miR-124, miR-146a, miR-155).

Main Results:

• Microglial function transitions are controlled by multiple molecular pathways.
• Post-transcriptional regulation by microRNAs significantly modulates microglial phenotypes.
• These pathways offer potential biomarkers and therapeutic targets for VaD.

Conclusions:

• Understanding these networks is key to reprogramming microglia from pro-inflammatory to reparative states.
• This provides a mechanistic basis for precision interventions in VaD.
• Targeting these pathways can help preserve neurovascular integrity and mitigate cognitive impairment.