Cholesterol-loaded nanoparticles ameliorate synaptic and cognitive function in Huntington's disease mice

Area of Science:

• Neuroscience
• Biotechnology
• Pharmacology

Background:

• Huntington's disease (HD) is associated with reduced brain cholesterol levels, impacting neuronal function and synapse integrity.
• Locally synthesized cholesterol is crucial for maintaining synapse structure and remodeling in the brain.

Purpose of the Study:

• To investigate the efficacy of cholesterol-loaded nanoparticles for brain delivery in HD mouse models.
• To assess the impact of enhanced brain cholesterol levels on synaptic and cognitive functions in HD.

Main Methods:

• Biodegradable polymeric nanoparticles (NPs) were modified with glycopeptides (g7) and loaded with cholesterol (g7-NPs-Chol).
• g7-NPs-Chol were administered intraperitoneally to HD mice to assess blood-brain barrier (BBB) crossing and cellular localization.
• Synaptic, cognitive, and global activity were evaluated after repeated systemic delivery of g7-NPs-Chol.

Main Results:

• g7-NPs demonstrated efficient BBB penetration and localized in glial and neuronal cells in the brain, unlike unmodified NPs.
• Repeated systemic administration of g7-NPs-Chol rescued synaptic and cognitive dysfunction in HD mice.
• Partial improvement in global activity was observed in HD mice treated with g7-NPs-Chol.

Conclusions:

• Cholesterol supplementation to the HD brain via g7-NPs-Chol reverses functional deficits.
• This nanoparticle-based drug delivery system shows promise for treating brain disorders characterized by cholesterol deficiency.