A hyperlipidemic diet induces structural changes in cerebral blood vessels

Area of Science:

• Neuroscience
• Cardiovascular Research
• Pathology

Background:

• Cerebrovascular pathology significantly contributes to mortality.
• Hyperlipidemia is a known cardiovascular risk factor and is implicated in neurodegenerative disorders.

Purpose of the Study:

• To investigate the impact of a hyperlipidemic (HL) diet on cerebral vessel morphology and amyloid deposition in hamsters.
• To utilize the hyperlipidemic hamster as a model for atherosclerosis research.

Main Methods:

• Hamsters were fed a HL diet and monitored for serum parameters.
• Histological analysis included paraffin embedding, thioflavin S staining, fluorescence, and electron microscopy (EM).
• Cerebral vessels and carotid arteries were examined at 3 and 6 months.

Main Results:

• HL hamsters exhibited elevated serum cholesterol and triglycerides.
• Carotid arteries showed fatty streaks and atherosclerotic plaques.
• Brain microvessels displayed irregular shapes, enlarged perivascular spaces, and lipoprotein particles.
• Thioflavin S staining indicated incipient amyloid deposits in capillary walls and endothelial cells.
• EM revealed lipid-laden perivascular cells in meningeal vessels of hypercholesterolemic hamsters.

Conclusions:

• HL diet-induced morphological changes in cerebral vessels may impair brain function.
• Findings suggest a link between hyperlipidemia and neurodegenerative processes.
• Reversing these changes could offer a therapeutic strategy for neurodegenerative diseases.