Enhanced metastatic potential of murine fibrosarcomas treated in vitro with ultraviolet radiation - PubMed (original) (raw)
. 1981 Aug;41(8):3018-23.
- PMID: 7248958
Enhanced metastatic potential of murine fibrosarcomas treated in vitro with ultraviolet radiation
M S Fisher et al. Cancer Res. 1981 Aug.
Abstract
The purpose of this study was to determine whether repeated treatment of tumor cells in vitro with mutagenic doses of ultraviolet (UV) radiation could influence the metastatic behavior of these cells in vivo. Three cloned lines of UV-2237, a fibrosarcoma induced in a C3H- mouse by chronic irradiation with UV, and SF-19, a spontaneous C3H- fibrosarcoma, were grown in culture. These cell lines varied from low to high metastatic potential as determined by in vivo tests. The cultures were exposed to UV radiation from an FS40 sunlamp at a dose that killed 40% of the cells. These UV radiation exposures were repeated at 3- to 5-day intervals for a total of 5 treatments. The mutation frequency was analyzed by monitoring the appearance of ouabain-resistant colonies following UV irradiation. With all four tumor lines, the frequency of conversion to ouabain resistance was increased more than 10-fold. Tumor cells given 5 UV radiation treatments and control cultures carried in parallel without exposure to UV radiation were tested for metastatic potential in an in vivo lung colony assay. Cell lines treated in vitro with UV radiation produced more experimental metastases than the counterpart unirradiated cultures. We conclude that, in all four tumor lines, exposure of tumorigenic cells to mutagenic doses of UV radiation can alter their biological behavior and that this may contribute to the progression of tumors from low to high metastatic capability.
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