Summary
Transformation of normal cells to malignant cells in vitro by chemical agents has been achieved in a number of fibroblastic and epithelial cell systems. The commonly sused assays for cell transformation employ either diploid Syrian hamster embryo fibroblasts or cells from some permanent mouse fibroblast lines. Under culture conditions these cells have an oriented pattern of growth, are cell density (or contact) inhibited, and are not tumorigenic when implanted in host animals. During cell transformation, these “normal” or control cells are converted into cells that have a hereditary random pattern of cell growth and can form tumors in appropriate hosts. The random pattern of growth of the transformed cells in either a colony or a focus is used as an end point for quantitatively determining cell transformation.
Carcinogenesis (and in vitro cell transformation) is at present believed to be a multistage process in which the initial step is due to a “mutation-like event” caused by the activated carcinogen. Using an in vitro mammalian cell-mediated mutagenicity assay, we were able to establish a relationship between the degree of mutagenesis in this assay, using Chinese hamster V79 cells as target cells, and the degree of activity of carcinogens (initiators) in experimental animal. This assay has also provided the means to study the organ specificity of chemical carcinogens. It is possible, however, that some environmental agents may act not as primary tumor initiating agents, but as tumor promoters, at a later stage of the carcinogenic process. Tumor promoters, including phorbol diesters and teleocidin, which also enhance cell transformation in vitro, usually do not bind to DNA and because they are devoid of mutagenic activity cannot be detected with mutagenicity assays. However, these agents can induce various effects, including a modulation of differentiation processes, in a number of cell types. In some human melanoma and leukemia cells in culture these tumor promoters, after binding to specific cellular receptors, induce the treated cells to diffrentiate into cells with characteristics of mature cells. This property of the tumor promoter to induce cell differentiation suggests that tumor promotion may, among other things, involve the expression of “mutated tumor genes” in a process similar to gene expression during cell differentiation. This paper discusses the usefulness of in vitro cell transformation, differentiation, and mutagenesis systems for studies of the mechanisms of carcinogenesis.
This work is supported by the United States Department of Energy under Contract No. W-31-109-ENG-38.
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Huberman, E. (1984). The Control of Cell Transformation, Mutagenesis, and Differentiation by Chemicals that Initiate or Promote Tumor Formation. In: Chu, E.H.Y., Generoso, W.M. (eds) Mutation, Cancer, and Malformation. Environmental Science Research, vol 31. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-2399-0_17
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