title: Evidence for a defective mitochondrial membrane in 1,2-dimethylhydrazine-induced colon adenocarcinoma in rat: enhanced lipid peroxidation potential in vitro.
abstract: Enhanced lipid peroxidation potential was measured in Holtzman rat colon tumors induced by chronic subcutaneous injection of 1,2-dimethyl-hydrazine as compared with normal colonic tissue. The peroxidation potentials were determined in the mitochondrial cellular components by measuring the ferrous-ascorbate induced formation of malondialdehyde. The tumor mitochondria were found to peroxidize at a rate 8-10-fold higher than the comparable normal tissue components. In addition, we found that the mitochondria from the cancer cells exhibited reduced NADH-cytochrome c reductase activity. These observations suggest an involvement of non-enzymatic free radical flux in DMH-induced carcinogenesis, which may be the result of structurally altered mitochondrial membranes.
mesh_terms: D000230:Adenocarcinoma / Q000139:chemically induced / Q000378:metabolism*; D000818:Animals; D002462:Cell Membrane / Q000473:pathology; D003110:Colonic Neoplasms / Q000139:chemically induced / Q000378:metabolism*; D004127:Dimethylhydrazines; D008054:Lipid Peroxides / Q000378:metabolism*; D008297:Male; D008928:Mitochondria / Q000378:metabolism*; D051381:Rats
chemical_list: D004127:Dimethylhydrazines; D008054:Lipid Peroxides