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MNU-induced point mutation and activation of c-Ha-ras oncogene in cell lines derived from human pancreas explants
K K Maheshwari1, I Parsa, W H Marsh
1Medical University of South Carolina, Department of Pediatrics, Charleston 29425.
Abstract:
Point mutation and activation of c-Ha-ras oncogene was studied at various stages of carcinogenesis in cell lines developed from MNU-treated human pancreas explants. DNAs from normal pancreas and nontumorigenic cell lines showed no transforming activity in NIH 3T3 cells whereas DNA from one of the tumorigenic cell lines transformed NIH 3T3 cells. In this cell line the point mutation was demonstrated to be at codon 12 of c-Ha-ras gene by the loss of an Msp I site. The mutation possibly affected the transcription of c-Ha-ras gene which in turn contributed to the transformation of these cells.
Insights
Researchers identified a specific point mutation in the c-Ha-ras oncogene within human pancreatic cancer cells. This genetic alteration in codon 12 was linked to cellular transformation and may impact gene transcription, contributing to cancer development.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Carcinogenesis involves genetic alterations, including oncogene activation.
- The c-Ha-ras oncogene is frequently implicated in various cancers.
- Understanding oncogene mutations in pancreatic cancer is crucial for developing targeted therapies.
Purpose of the Study:
- To investigate point mutations and activation of the c-Ha-ras oncogene during pancreatic carcinogenesis.
- To determine the transforming activity of DNA from MNU-treated human pancreatic cell lines.
- To identify specific genetic alterations in tumorigenic pancreatic cell lines.
Main Methods:
- Development of cell lines from MNU-treated human pancreas explants.
- NIH/3T3 cell transformation assays to assess DNA activity.
- Molecular analysis, including Msp I restriction digestion, to detect mutations in the c-Ha-ras gene.
Main Results:
- DNA from normal and nontumorigenic pancreatic cell lines showed no NIH/3T3 transforming activity.
- DNA from a tumorigenic pancreatic cell line induced NIH/3T3 cell transformation.
- A point mutation at codon 12 of the c-Ha-ras gene was identified in the transforming cell line, evidenced by the loss of an Msp I site.
Conclusions:
- A specific point mutation in the c-Ha-ras gene at codon 12 is associated with the transformation of human pancreatic cells.
- This mutation may alter c-Ha-ras gene transcription, contributing to oncogenesis.
- The findings highlight the role of c-Ha-ras mutations in pancreatic cancer development.