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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Induction of morphological transformation, anchorage-independent growth and plasminogen activators in non-tumorigenic human osteosarcoma cells by lead chromate.

The possible carcinogenicity of insoluble chromium (VI) compound, PbCrO4, in human cells has been tested using a nontumorigenic human osteosarcoma cell line ( HOS, TE 85). Electron microscopic studies show that PbCrO4 is phagocytosed by HOS cells and accumulates within the vacuoles in the cytoplasm. A number of cell lines have been isolated following multiple treatment of HOS cells with PbCrO4. These cell lines are morphologically different from HOS cells, form anchorage-independent colonies in soft agar and form quickly regressing small tumor nodules in athymic nude mice. The cellular and secreted plasminogen activator (PA) levels of 5 cell lines isolated after PbCrO4 treatment are increased up to 8 fold and up to 10 fold respectively as compared to untreated HOS controls. SDS-PAGE analysis in the presence of copolymerized substrates is consistent with increase in 55 kDa urokinase-type PA ( u-PA) and 68 kDa tissue-type PA ( t-PA). These results show that PbCrO4 treatment leads to stable phenotypic changes indicative of the transformation of HOS cells.[1]


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