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Differential exon expression in myelin basic protein transcripts during central nervous system (CNS) remyelination
C A Jordan1, V L Friedrich, F de Ferra
1Laboratory of Viral and Molecular Pathogenesis, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland 20892.
Cellular and Molecular Neurobiology
|March 11, 1990
Summary
During central nervous system (CNS) remyelination, myelin basic protein (MBP) transcript expression, particularly exon 2-containing forms, is upregulated in oligodendrocytes, mirroring developmental patterns.
Area of Science:
- Neuroscience
- Molecular Biology
- Immunology
Background:
- The adult central nervous system (CNS) has limited capacity for myelin repair.
- Understanding molecular events during remyelination is crucial for developing therapeutic strategies.
- Mouse coronavirus infection in C57B1/6 mice provides a model for studying CNS demyelination and subsequent remyelination.
Purpose of the Study:
- To investigate the expression patterns of myelin basic protein (MBP) transcripts during CNS remyelination.
- To characterize the molecular mechanisms underlying myelin repair in a mouse model of demyelination.
Main Methods:
- Utilized RNase protection assays and in situ hybridization to analyze MBP transcript expression.
- Examined MBP transcript changes in demyelinating lesions of mice infected with mouse coronavirus.
- Compared transcript levels at different time points post-infection (WPI) with control white matter.
Main Results:
- Total MBP transcripts decreased by 75% in lesions at 3 WPI.
- An increase in MBP transcripts containing exon 2 was detected, coinciding with early remyelination signs.
- Exon 2-containing MBP transcripts showed a 13-fold peak abundance in lesions, with perinuclear clustering in oligodendrocytes.
- Later stages of remyelination showed increased, more diffuse expression of MBP transcripts lacking exon 2.
Conclusions:
- Remyelination involves the abundant expression and specific regulation of pre-forms of MBP transcripts, similar to developmental myelination.
- Oligodendrocytes play a key role in regulating MBP transcript expression during myelin repair.
- The findings provide insights into the molecular control of myelin regeneration in the adult CNS.