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Platelet-derived growth factor receptor is expressed by cells in the early oligodendrocyte lineage
1Department of Anatomy, UCLA, School of Medicine 90024-1759.
Insights
Platelet-derived growth factor receptor alpha (PDGFR alpha) mRNA is found in developing rat oligodendrocytes. This indicates PDGFR alpha
Area of Science:
- Neuroscience
- Developmental Biology
- Cell Biology
Background:
- Oligodendrocytes are crucial glial cells in the central nervous system, responsible for myelin sheath formation.
- Understanding the molecular markers and developmental stages of oligodendrocytes is key to studying demyelinating diseases and brain development.
Purpose of the Study:
- To investigate the expression and localization of Platelet-Derived Growth Factor Receptor alpha (PDGFR alpha) mRNA in developing rat forebrain oligodendrocytes.
- To correlate PDGFR alpha expression with specific oligodendrocyte lineage markers and developmental stages.
Main Methods:
- Combined immunocytochemistry and in situ hybridization were used to detect PDGFR alpha mRNA.
- Phenotypic markers including GD3 ganglioside, O4 sulfatide, galactocerebroside, neurofilament, S-100, and GFAP were utilized to identify cell types.
Main Results:
- PDGFR alpha mRNA was colocalized with GD3 and O4 sulfatide, markers for oligodendrocyte progenitors and pre-oligodendrocytes.
- Three distinct populations expressing PDGFR alpha were identified: GD3+, GD3+/O4+, and O4+ cells.
- Immature oligodendrocytes (galactocerebroside+), neurons (neurofilament+), and astrocytes (S-100/GFAP+) did not express PDGFR alpha mRNA.
- PDGFR alpha mRNA expression was observed in post-migratory, proliferative oligodendrocyte populations prior to myelin protein expression.
Conclusions:
- PDGFR alpha is expressed in specific progenitor and pre-oligodendrocyte stages during early postnatal rat forebrain development.
- PDGFR alpha expression marks a proliferative, post-migratory phase in the oligodendrocyte lineage, preceding terminal differentiation and myelination.
Abstract:
We report the localization of PDGFR alpha mRNA (PDGFR alpha) in phenotypically defined cells during the first postnatal week of rat forebrain development. Using a method of combined immunocytochemistry and in situ hybridization we have demonstrated the cellular colocalization of PDGFR alpha mRNA with GD3 ganglioside or O4 sulfatide, phenotypic markers of oligodendrocytes, in the gray and white matter of the dorsal cerebral cortex at all ages studied. Population analysis of the PDGFR alpha +/GD3+ and PDGFR alpha+/O4+ cells revealed that three populations express PDGFR alpha: GD3+, GD3+/O4+, and O4+, corresponding to two lineage stages, progenitor and preoligodendrocyte, in oligodendrocyte development. Immature oligodendrocytes, identified by galactocerebroside immunoreactivity, did not express detectable levels of PDGFR alpha mRNA. Post-mitotic neurons, identified by immunoperoxidase localization of the 68 kD neurofilament, and astrocytes identified by S-100 or GFAP immunoreactivity were also negative for PDGFR alpha mRNA. The spatial and temporal expression of PDGFR alpha mRNA occurred in oligodendrocyte cell populations which are post-migratory and proliferative, but which do not express myelin proteins characteristic of post-mitotic oligodendrocytes.