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Expression of v-src arrests murine glial cell differentiation
J Trotter1, C A Boulter, H Sontheimer
1Department of Neurobiology, University of Heidelberg, Federal Republic of Germany.
Abstract:
A replication-defective retroviral vector carrying the v-src oncogene and the gene for neomycin resistance was used to infect neurone- and fibroblast-depleted embryonic mouse brain cells in vitro. Cells resistant to the antibiotic G418 were obtained and continually passaged. Several cell lines were isolated which express high levels of v-src mRNA and v-src tyrosine kinase activity. The antigenic marker profile of either the pooled cells from an individual infection or sublines isolated from individual foci showed the cells to be immature glia: most cells expressed vimentin, A2B5 antigen and/or J1/tenascin glycoproteins, but not fibronectin. Sublines expressed different antigen profiles suggesting that the immortalised cells were derived from glial cells of different phenotypes. The cell lines expressed the 120 and 140 but not the 180 kd components of N-CAM as well as voltage-activated potassium channels, typical for glial cells. 01 antigen-positive oligodendrocytes were never observed in the lines or sublines after long term passage (over 1 year), but some cells expressed glial fibrillary acidic protein, a marker for mature astrocytes. Thus, expression of v-src in murine glial cells appears to arrest their development and prevent their differentiation.
Insights
Introducing oncogenes into mouse glial cells using a retroviral vector halts their development. This study demonstrates that v-src oncogene expression prevents glial cell differentiation, impacting neural development research.
Area of Science:
- Neuroscience
- Molecular Biology
- Cell Biology
Background:
- Glial cells are crucial for central nervous system development and function.
- Understanding glial cell differentiation is key to neurodevelopmental research.
- Oncogenes can alter cellular behavior and differentiation pathways.
Purpose of the Study:
- To investigate the effect of v-src oncogene expression on murine glial cell differentiation.
- To establish immortalized glial cell lines for studying neural development.
- To characterize the phenotype of v-src-expressing glial cells.
Main Methods:
- Infection of embryonic mouse brain cells with a replication-defective retroviral vector encoding v-src and neomycin resistance.
- Selection of G418-resistant cells and isolation of immortalized cell lines.
- Analysis of v-src mRNA and tyrosine kinase activity.
- Immunophenotyping using antigenic markers (vimentin, A2B5, J1/tenascin, fibronectin, N-CAM, GFAP) and electrophysiological recordings (potassium channels).
Main Results:
- Isolated cell lines expressed high levels of v-src mRNA and tyrosine kinase activity.
- Immunophenotyping indicated the cells were immature glia, expressing markers like vimentin and A2B5, but not fibronectin.
- Cell lines exhibited glial cell characteristics, including voltage-activated potassium channels and specific N-CAM components.
- Some cell lines expressed glial fibrillary acidic protein (GFAP), a marker for mature astrocytes, while O1 antigen-positive oligodendrocytes were absent.
- v-src expression appeared to arrest glial cell development and inhibit differentiation.
Conclusions:
- Expression of the v-src oncogene in murine glial cells leads to an arrest in their developmental trajectory.
- The immortalized glial cell lines generated serve as a valuable model for studying glial cell biology and the impact of oncogenes on neural development.
- These findings suggest that oncogenic signaling can disrupt normal glial differentiation, with potential implications for understanding neurological disorders.