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Tumorigenicity assay of the human mammary carcinoma cell line MCF-7
I Marics1, J Adelaide, O Rosnet
1U. 119 INSERM, Marseille, France.
Abstract:
A tumorigenicity assay was performed using DNA extracted from the human mammary carcinoma cell line MCF-7. Seven nude mouse tumors were obtained and were analyzed for the presence of human sequences and known activated oncogenes. The c-erbB.2/neu gene was identified in two tumors and two ras oncogenes in two other tumors. In order to characterize the mechanism of activation of the c-erbB.2/neu oncogene, we isolated and analyzed this gene from one of the tumors. The cloned gene did not present any rearrangement. c-erbB.2/neu transcripts from the nude mice tumors were of normal size. In one case overexpression was observed.
Insights
This study identified activated oncogenes, including c-erbB.2/neu and ras, in human mammary carcinoma (MCF-7) cell line tumors grown in nude mice. One tumor showed overexpression of the c-erbB.2/neu gene without rearrangement.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- The human mammary carcinoma cell line MCF-7 is a model for breast cancer research.
- Tumorigenicity assays in nude mice are used to study human tumor growth and oncogene activation.
- Identifying activated oncogenes is crucial for understanding cancer development.
Purpose of the Study:
- To investigate the presence and activation of oncogenes in tumors derived from MCF-7 cells in nude mice.
- To characterize the molecular mechanism of c-erbB.2/neu oncogene activation.
Main Methods:
- Tumorigenicity assay using MCF-7 cell line DNA in nude mice.
- Analysis of nude mouse tumors for human sequences and known activated oncogenes (c-erbB.2/neu, ras).
- Isolation and characterization of the c-erbB.2/neu gene from a tumor.
Main Results:
- Seven nude mouse tumors were successfully generated.
- Human sequences and activated oncogenes were detected in the tumors.
- The c-erbB.2/neu gene was found in two tumors, and two ras oncogenes in two other tumors.
- The cloned c-erbB.2/neu gene showed no rearrangement, and transcripts were of normal size.
- Overexpression of c-erbB.2/neu was observed in one tumor.
Conclusions:
- Tumors derived from MCF-7 cells can harbor activated oncogenes.
- c-erbB.2/neu activation in this model may involve mechanisms other than gene rearrangement, such as overexpression.
- Further investigation into oncogene activation in breast cancer models is warranted.