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© 1999 Oxford University Press

Article

238Pu {alpha}-particle-induced C3H10T1/2 transformants are less tumorigenic than the X-ray-induced equivalent

Margaret M. Lehane1,4, Peter E. Bryant2, Andrew C. Riches2, Louise A. Allen1, Cecilie V. Briscoe2, Jean Melville2 and Andrew J. Mill1,3

1 Radiobiology Laboratory, Nuclear Electric Ltd, Berkeley Centre, Berkeley GL13 9PB,
2 School of Biomedical Sciences, University of St Andrews, Bute Medical Building, St Andrews KY16 9TS and
3 Faculty of Applied Sciences, University of the West of England, Frenchay Campus, Coldharbour Lane, Bristol BS16 9TS, UK

Transformation is a complex multistage process in vitro by which benign cells gradually acquire characteristics of tumour cells. Transformed C3H10T1/2 cells appear in vitro as multilayers of cells termed foci. A variety of transformed phenotypes are observed in vitro and in this study samples of these phenotypes were developed as cell lines and assessed for their ability to induce tumours in C3H mice. It was found that, while a high proportion of X-ray-induced transformants were tumorigenic, most of the {alpha}-particle-induced transformants were non-tumorigenic. Although tumours produced by the X-ray-induced transformants appeared earlier, they grew at similar rates to the {alpha}-particle-induced equivalent. Foci were classified as fully or partially tumorigenic depending on whether the foci produced at least one tumour in the mice injected (partially tumorigenic) or produced tumours in all mice injected (fully tumorigenic). It was found that tumours from the partially tumorigenic foci grew slower or appeared later than those of the fully tumorigenic foci. It is hypothesized that the apparent low tumorigenicity of positively transformed {alpha}-particle-induced foci is due to an increase in genomic instability of progeny focus cells compared with X-ray-induced foci leading to a larger non-viable population of cells in the {alpha}-particle-induced foci.


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