Direct glia-to-neuron conversion mitigates hippocampal damage in a vascular dementia mouse model

Area of Science:

• Neuroscience
• Regenerative Medicine
• Dementia Research

Background:

• Vascular dementia is a major global health issue, second only to Alzheimer's disease.
• Inducing neurogenesis is a potential therapeutic strategy for vascular dementia.
• The asymmetric carotid artery stenosis (ACAS) model mimics vascular dementia conditions.

Purpose of the Study:

• To assess the therapeutic effects of glia-to-neuron conversion in an ACAS mouse model.
• To compare the efficacy of Ptbp1 knockdown (KD) versus Ascl1, NeuroD1, and Sox2 (ANS) transduction.
• To evaluate neurogenesis, CA1 preservation, and inflammatory responses post-intervention.

Main Methods:

• Mice underwent ACAS surgery followed by viral vector administration (Ptbp1 KD or ANS).
• Immunohistochemical analysis was performed 2 months post-surgery.
• Key metrics included CA1 thickness, hippocampal inflammation markers, and neurogenesis (NeuN/mCherry+ cells).

Main Results:

• The ACAS + ANS group showed significantly thicker CA1 compared to the ACAS + Ptbp1 KD group.
• Both ACAS + ANS and ACAS + Ptbp1 KD groups exhibited suppressed hippocampal inflammation.
• Neurogenesis was observed in the dentate gyrus for both groups, but only in CA1 for the ACAS + ANS group.

Conclusions:

• AAV-pGFAP-ANS effectively induced glia-to-neuron reprogramming in the ACAS model.
• This reprogramming suppressed hippocampal inflammation.
• The ANS approach demonstrated therapeutic potential for vascular dementia by promoting neurogenesis and preserving neural structures.