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Tumors have evolved numerous mechanisms by which they can escape from immune surveillance. One of these is to produce immunosuppressive cytokines. Transforming growth factor-β(TGF-β) is a pleiotropic cytokine with a crucial function in mediating immune suppression, especially in the tumor microenvironment. TGF-β produced by T cells has been demonstrated as(More)
In this study, we examined the mutagenicity of sodium arsenite at the xathine-guanine phosphoribosyl transferase locus (gpt) in a pSV2 gpt-transformed CHO cell line AS52. The chemical induced a dose-dependent increase of mutant frequency at the locus. Nested PCR analysis revealed that the majority of arsenite-induced AS52 mutants had totally deleted the gpt(More)
In this study, we have examined the mutagenicity of sodium arsenite at the xanthine-guanine phosphoribosyltransferase locus (ypt) in a pSV2 gpt-transformed CHO cell line, AS52. Our results provide very weak evidence for arsenite as a gene mutagen because the chemical at high doses and at high cytotoxicity enhances barely a doubling of mutant frequency (MF)(More)
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