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• W1938821831 abstract "A major limitation to successful cancer treatment is the existence of drug resistance. While several mechanisms of drug resistance have now been well characterized, mechanisms of resistance to alkylating drugs have remained less well defined. Several experimental models of alkylator resistance have implicated isoforms of glutathione S-transferase (GST) but transfection experiments using cloned isoforms of GST have yielded conflicting results. While there are several plausible explanations for these apparently contradictory findings, the issue that clonal variability might potentially confound the results of conventional transfection experiments has been raised. To address this issue properly, we have studied rat GST-Yc expression and drug sensitivity to alkylating drugs in populations of mouse NIH 3T3 fibroblasts following either transfection or transduction with an N2-based retrovirus vector. In comparison with cells treated with an antisense vector, Yc-transfected and Yc-transduced populations of NIH 3T3 cells expressed increased levels of GST-Yc mRNA (Northern blot), increased levels of immunodetectable GST-Yc (Western blot), and, respectively, 1.4- and 1.9-fold increases in total GST activity and 6.1- and 8.3-fold increases in glutathione peroxidase activity (associated with the Yc subunit). Yc-transfected and Yc-transduced cell populations were, respectively, 5.8- (P < 0.001) and 2.4-fold (P < 0.05) resistant to chlorambucil and 10.8- (P < 0.01) and 5.4-fold (P < 0.001) resistant to mechlorethamine. The range of resistance of clonal isolates from either population was 1.8-6.0-fold for chlorambucil and 4.6-6.1-fold for mechlorethamine (P < 0.05). In contrast, these cells showed unaltered sensitivity to the antimetabolite methotrexate, a nonalkylating drug. These results clearly demonstrate that the rat GTS-Yc is able to confer alkylating drug resistance in mouse fibroblasts. The ability to confer alkylating drug resistance following retrovirus-mediated gene transfer also raises the possibility of using GST-Yc somatic gene transfer to confer protection to the hematopoietic system in a gene therapy strategy applicable to cancer." @default.
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• W1938821831 date "1994-08-15" @default.
• W1938821831 modified "2023-10-17" @default.
• W1938821831 title "Retrovirus-mediated gene transfer of rat glutathione S-transferase Yc confers alkylating drug resistance in NIH 3T3 mouse fibroblasts." @default.
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