title: Influences of strain and diet on the promoting effects of sodium L-ascorbate in two-stage urinary bladder carcinogenesis in rats.
abstract: The influences of strain and diet on the promoting effects of sodium L-ascorbate (SA) on two-stage urinary bladder carcinogenesis was investigated in male F344 and Lewis rats. Two kinds of commercial basal diets, Oriental MF and Clea CA-1, were used. Rats were given 0.05% N-butyl-N-(4-hydroxybutyl)nitrosamine in their drinking water for 4 weeks and then basal diet with 5% SA or without SA for 32 weeks. Treatment with SA increased the induction of neoplastic lesions of the urinary bladder in rats initiated by 0.05% N-butyl-N-(4-hydroxybutyl)nitrosamine. The promoting effect of SA for urinary bladder carcinogenesis was: F344 strain-Oriental MF diet greater than Lewis strain-Clea CA-1 diet greater than F344 strain-Clea CA-1 diet = Lewis stain-Oriental MF diet. In both strains or with both diets, SA-treatment increased the urinary pH and the concentrations of sodium ion and total ascorbic acid. These results demonstrate that strain and diet strongly influence susceptibility to the SA-promoting effects in rat urinary bladder carcinogenesis.
mesh_terms: D000818:Animals; D001205:Ascorbic Acid / Q000633:toxicity* / Q000652:urine; D002085:Butylhydroxybutylnitrosamine / Q000008:administration & dosage; D002277:Carcinoma / Q000209:etiology*; D003043:Cocarcinogenesis; D004032:Diet; D006863:Hydrogen-Ion Concentration; D051381:Rats; D011916:Rats, Inbred F344 / Q000502:physiology; D011917:Rats, Inbred Lew / Q000502:physiology; D012964:Sodium / Q000652:urine; D001749:Urinary Bladder Neoplasms / Q000209:etiology*
chemical_list: D002085:Butylhydroxybutylnitrosamine; D012964:Sodium; D001205:Ascorbic Acid