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High cholesterol level is essential for myelin membrane growth
Gesine Saher1, Britta Brügger, Corinna Lappe-Siefke
1Department of Neurogenetics, Max Planck Institute of Experimental Medicine, 37075 Goettingen, Germany.
Nature Neuroscience
|March 29, 2005
Summary
Cholesterol is vital for myelin development in the brain. Mice lacking cholesterol synthesis in oligodendrocytes showed impaired myelination and neurological deficits, highlighting cholesterol
Area of Science:
- Neuroscience
- Cell Biology
- Biochemistry
Background:
- Cholesterol is implicated in neurodegenerative diseases.
- The mature brain has high cholesterol content, primarily in myelin.
- The normal function of brain cholesterol remains unclear.
Purpose of the Study:
- To investigate the role of cholesterol synthesis in oligodendrocytes for myelin formation.
- To understand the impact of cholesterol deficiency on central nervous system (CNS) myelination and brain maturation.
Main Methods:
- Generation of mice with cholesterol synthesis deficiency in oligodendrocytes.
- Analysis of CNS myelination and oligodendrocyte function in mutant mice.
- Assessment of neurological phenotypes, including ataxia and tremor.
Main Results:
- Oligodendrocytes lacking cholesterol synthesis survived but severely impaired CNS myelination.
- Mutant mice exhibited ataxia and tremor, indicating neurological dysfunction.
- Despite deficiency, oligodendrocytes enriched cholesterol and formed myelin with substantial cholesterol content.
Conclusions:
- Cholesterol is indispensable for myelin membrane integrity and CNS myelination.
- Oligodendrocyte cholesterol availability is a rate-limiting factor for brain maturation.
- This study elucidates the critical role of cholesterol in myelin development and brain function.