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Transcripts for secreted and GPI-anchored brevican are differentially distributed in rat brain
C I Seidenbecher1, E D Gundelfinger, T M Böckers
1Leibnitz Institute for Neurobiology, Magdeburg, Germany. seidenc@ifn-magdeburg.de
The European Journal of Neuroscience
|September 29, 1998
Summary
Brevican, a proteoglycan in the nervous system, exists in secreted and cell-surface forms. This study reveals secreted brevican is in neurons, while GPI-anchored brevican is in glial cells, suggesting a neuroglial function.
Area of Science:
- Neuroscience
- Molecular Biology
- Proteoglycan Research
Background:
- Brevican is a proteoglycan found in the nervous system, existing as both secreted and cell-surface (GPI-anchored) isoforms.
- Both brevican variants originate from the same gene but are processed into distinct transcripts.
Purpose of the Study:
- To investigate the cellular localization and developmental expression of secreted and GPI-anchored brevican transcripts in the postnatal rat brain.
- To elucidate the functional roles of different brevican isoforms in neurodevelopment.
Main Methods:
- In situ hybridization to detect mRNA distribution in brain tissue.
- Reverse transcriptase-polymerase chain reaction (RT-PCR) on glial cell cultures.
- Biochemical analysis of brevican in isolated optic nerve fractions.
Main Results:
- The 3.6-kb transcript for secreted brevican is widespread in grey matter neurons.
- The 3.3-kb transcript for GPI-anchored brevican is primarily found in white matter glial cells.
- GPI-anchored brevican expression is delayed compared to secreted brevican during development and is associated with brain myelin.
Conclusions:
- Distinct cellular expression patterns suggest specialized roles for secreted and GPI-anchored brevican isoforms.
- GPI-anchored brevican's association with glial cells and myelin indicates a potential function in neuroglia and myelination.