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Expression of three viral oncogenes (v-sis, v-myc, v-fos) in primary human brain tumors of neuroectodermal origin
M Fujimoto1, F J Weaker, D C Herbert
1Department of Surgery, University of Texas Health Science Center at San Antonio 78284.
Abstract:
We determined which viral oncogenes (v-sis, v-myc, and v-fos) were expressed in five primary human brain tumors of neuroectodermal origin (two glioblastomas multiforme, one medulloblastoma, one cystic cerebellar astrocytoma, and one ganglioglioma) and which of these oncogenes is correlated with malignancy. Using the dot hybridization technique, we determined the relative amounts of mRNA coded by these genes using the same nitrocellulose filter. The v-myc probe showed a 4- to 12-fold greater hybridization to the mRNA from two glioblastomas and the medulloblastoma (malignant group) than the mRNA from the cystic cerebellar astrocytoma or the ganglioglioma (benign group). In contrast, RNA hybridizing to v-sis and v-fos were accumulated to a greater extent in the benign tumors. These data suggest that the amount of myc expression may be correlated with the degree of malignancy of brain tumors of neuroectodermal origin.
Insights
This study investigated viral oncogenes in human brain tumors. Findings suggest that myc gene expression correlates with the malignancy of neuroectodermal brain tumors.
Area of Science:
- Oncology
- Molecular Biology
- Neuroscience
Background:
- Viral oncogenes play a role in cellular transformation and tumorigenesis.
- Understanding oncogene expression in brain tumors is crucial for diagnosis and treatment.
Purpose of the Study:
- To determine the expression levels of viral oncogenes (v-sis, v-myc, v-fos) in human brain tumors of neuroectodermal origin.
- To identify correlations between the expression of these oncogenes and tumor malignancy.
Main Methods:
- Analysis of five primary human brain tumors: two glioblastomas multiforme, one medulloblastoma, one cystic cerebellar astrocytoma, and one ganglioglioma.
- Dot hybridization technique to quantify mRNA levels for v-sis, v-myc, and v-fos.
- Comparison of oncogene expression between malignant and benign tumor groups.
Main Results:
- v-myc mRNA levels were significantly higher (4- to 12-fold) in malignant tumors (glioblastomas, medulloblastoma) compared to benign tumors (astrocytoma, ganglioglioma).
- v-sis and v-fos RNA showed greater accumulation in benign tumors than in malignant ones.
- Differential expression patterns observed for the three viral oncogenes across tumor types.
Conclusions:
- The expression level of the myc oncogene may be associated with the degree of malignancy in human brain tumors of neuroectodermal origin.
- v-sis and v-fos oncogenes may have different roles or regulatory mechanisms in brain tumor development.
- Further research is warranted to elucidate the precise roles of these viral oncogenes in neuro-oncogenesis.