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Glial fibrillary acidic protein synthesized in vitro using messenger RNA from a human glioma cell line
Abstract:
Messenger RNA (mRNA) extracted from a continuous human glioma cell line grown in culture or as a solid tumor was translated in an mRNA-dependent reticulocyte lysate system. Translation products labeled with [35S]methionine were immunoprecipitated with antiserum specific for glial fibrillary acidic (GFA) protein, separated by one- and two-dimensional polyacrylamide gel electrophoresis and analyzed fluorographically. Immunoprecipitates from both cell culture and tumor mRNA translations had a molecular weight of 49,000 daltons, consistent with GFA protein extracted from human tissue. In two dimensions, the 49,000-dalton band resolved into two to three spots at pH 5.7-5.9, the isoelectric point of GFA protein. Minor lower molecular weight products were detected in fluorographs of heavily overloaded gels or in film exposed for extended periods of time. These data indicate that the GFA protein produced by this glioma cell line is chemically and immunologically similar to normal human GFA protein, which suggests that the primary phenotypic expression of GFA protein in this tumor cell line is not altered by the neoplastic process.
Insights
This study shows that glial fibrillary acidic (GFA) protein from a human glioma cell line is chemically and immunologically similar to normal GFA protein. This suggests that the neoplastic process does not alter the primary phenotypic expression of GFA protein.
Area of Science:
- Neuroscience
- Molecular Biology
- Oncology
Background:
- Glioma is a primary brain tumor.
- Glial fibrillary acidic (GFA) protein is a key intermediate filament protein in astrocytes.
- Understanding GFA protein expression in glioma is crucial for diagnosis and treatment.
Purpose of the Study:
- To investigate the characteristics of GFA protein produced by a human glioma cell line.
- To compare the GFA protein from glioma cells with that from normal human tissue.
- To determine if the neoplastic process alters GFA protein expression.
Main Methods:
- Messenger RNA (mRNA) from a human glioma cell line was translated in a reticulocyte lysate system.
- Translation products were immunoprecipitated using GFA protein-specific antiserum.
- Proteins were analyzed using one- and two-dimensional polyacrylamide gel electrophoresis and fluorography.
Main Results:
- Translated products showed a molecular weight of 49,000 daltons, consistent with human GFA protein.
- Two-dimensional electrophoresis revealed spots at the isoelectric point of GFA protein (pH 5.7-5.9).
- Minor lower molecular weight products were detected under specific conditions.
Conclusions:
- The GFA protein synthesized by the glioma cell line is chemically and immunologically similar to normal human GFA protein.
- The neoplastic process in this glioma cell line does not appear to alter the primary phenotypic expression of GFA protein.
- These findings support the use of GFA protein as a reliable marker in glioma research.