title: Transformation of rat liver epithelial cells with v-H-ras or v-raf causes expression of MDR-1, glutathione-S-transferase-P and increased resistance to cytotoxic chemicals.
abstract: We have examined the relationship between transformation and multidrug resistance by employing the v-H-ras or v-raf oncogenes to transform rat liver epithelial (RLE) cells in vitro. The data indicate that transformation of RLE cells with v-H-ras or v-raf results in increased resistance to the cytotoxins adriamycin, vinblastine and 2-acetylaminofluorene. This multidrug resistance is accompanied by increasing expression of P-glycoprotein (MDR-1) and glutathione-S-transferase P (GST-P). Thus, neoplastic transformation of RLE cells with v-raf or v-H-ras, independently of chemical exposure, results in multidrug resistance.
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D000818:Animals; D000970:Antineoplastic Agents / Q000494:pharmacology*; D002470:Cell Survival / Q000187:drug effects; D002471:Cell Transformation, Neoplastic / Q000378:metabolism*; D004351:Drug Resistance / Q000235:genetics; D005982:Glutathione Transferase / Q000096:biosynthesis* / Q000235:genetics; D008099:Liver / Q000187:drug effects*; D008562:Membrane Glycoproteins / Q000096:biosynthesis*; D009857:Oncogenes; D010920:Placenta / Q000201:enzymology; D051381:Rats
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D000970:Antineoplastic Agents; D008562:Membrane Glycoproteins; D005982:Glutathione Transferase