Perturbed cholesterol homeostasis in aging spinal cord

Area of Science:

• Neuroscience
• Aging Research
• Molecular Biology

Background:

• The spinal cord is crucial for sensorimotor function, transmitting signals between the brain and periphery.
• Spinal cord aging impairs function, but the underlying molecular mechanisms remain unclear.

Purpose of the Study:

• To investigate the molecular mechanisms of spinal cord aging.
• To characterize changes in gene expression and cholesterol homeostasis in aging rat spinal cords.

Main Methods:

• Microarray analysis of gene expression in cervical spinal cords of aging rats.
• Quantification of myelin and neuroinflammation markers.
• Measurement of total cholesterol content and cholesterol ester accumulation.

Main Results:

• Cholesterol synthesis genes were downregulated, while cholesterol transport and metabolism genes were upregulated.
• Total cholesterol content increased, associated with cholesterol ester accumulation.
• Increased markers of microglial phagocytosis and astrogliosis were observed, particularly in white matter, with minimal changes in myelin markers.

Conclusions:

• Perturbed cholesterol homeostasis is a significant feature of spinal cord aging.
• Increased neuroinflammation in white matter may contribute to altered cholesterol metabolism.
• These changes likely play a role in age-related decline in spinal cord function.