© 1991 Oxford University Press
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Comparison of ras activation during epidermal carcinogenesis in vitro and in vivo
1Cancer Research Campaign Beatson Laboratories, Beatson Institute for Cancer Research Garscube Estate, Switchback Road, Bearsden, Glasgow G61 1BD, UK
2Instituto di Investigaciones Biomedicas CSIC, 28029, Madrid, Spain
3Department of Hematology, Johannes Gutenberg University Mainz, FRG
4University of Chicago, Department of Radiation Oncology Chicago, IL, USA
5University of Arizona, Department of Radiation Oncology Tucson, AZ, USA
6To whom correspondence should be addressed
Mouse epidermal cells have frequently been used to study the role of ras oncogenes in transformation in vivo and in vitro. After initiation with dimethylbenzanthracene (DMBA) in vivo, >90% of the papillomas arising show the same A:T - T:A transversion at codon 61 of the H-ras gene, presumed to be the initiating event. On the other hand, initiation of epidermal cells in culture with carcinogens, followed by selection of initiated cells by resistance to calclum-induced differentiation, does not in general lead to the isolation of clones carrying mutant ras genes. Some other aspects of tumour progression in vivo can be reproduced using epidermal cells in culture: a rare DMBA transfonnant carrying the codon 61 mutation and expressing a 2:1 ratio of normal to mutant ras alleles gave rise upon transplantation to a more aggressive line in which the ratio of normal to mutant H-ras genes (and p21 products) was reversed. Similar alterations in ras gene dosage have been seen during progression of papillomas to carcinomas in vivo. We conclude that the mechanisms of initiation in vitro may differ substantially from in vivo, and depend on the particular culture conditions used. Moreover, the effects of mutant H-ras expression in mouse epidermal cells are variable depending on the genetic background of the cell.
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