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Expression of the c-src protooncogene in human skin tumors
Abstract:
Retroviral oncogenes are genetic elements, the expression of which is responsible for the transformed phenotype of cells. These genes are derived from normal cellular DNA sequences called cellular protooncogenes, which are present in all human cells and seem to have potential transforming ability in tumors of nonviral origin, since it is possible that they undergo structural alterations and/or changes in their expression. Human skin tumors were analyzed in this study with respect to the expression of the c-src protooncogene, the cellular homologue of the Rous sarcoma virus transforming gene, by measuring the enzymatic activity of its gene product, the pp60c-src kinase activity. Tyrosine-specific kinase activity was detected in all skin tumors tested. The expression pattern of the c-src gene product in the melanomas tested was differential and varying kinase levels in different metastases from the same patient were detected. The elevation of kinase activity as compared to normal skin ranged from about 4- to 20-fold.
Insights
Cellular protooncogenes, like c-src, can drive tumor growth. This study found elevated pp60c-src kinase activity in human skin tumors, particularly melanomas, indicating its role in cancer development.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Retroviral oncogenes originate from cellular protooncogenes.
- Protooncogenes, such as c-src, are present in normal human cells.
- Alterations in protooncogene expression or structure can contribute to tumor formation.
Purpose of the Study:
- To investigate the expression of the c-src protooncogene in human skin tumors.
- To quantify the enzymatic activity of its gene product, pp60c-src kinase.
Main Methods:
- Analysis of human skin tumors.
- Measurement of pp60c-src kinase activity.
Main Results:
- Tyrosine-specific kinase activity of pp60c-src was detected in all tested skin tumors.
- Differential expression and varying kinase levels were observed in melanomas, even between metastases from the same patient.
- Kinase activity was elevated 4- to 20-fold compared to normal skin.
Conclusions:
- The c-src protooncogene product, pp60c-src, is expressed in human skin tumors.
- Elevated pp60c-src kinase activity suggests its involvement in the pathogenesis of skin cancers, including melanoma.
- Variability in kinase levels highlights potential complexities in c-src's role across different tumor sites and metastases.