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Biomedical subjects

S Lock

Publications and source records attributed to S Lock.

53 records · Page 3Linked to original sources
PubMed1978

Toxicity of butylated hydroxytoluene in mouse following oral administration.

Male Swiss--Webster mice were given 400 mg/kg of butylated hydroxytoluene ([methyl-14C]toluene) by stomach tube. Radioactivity was measured in plasma, lung, liver and kidney from 0.5 h to 10 days later. Radioactivity associated with butylated hydroxytoluene (BHT) or its metabolites was highest in plasma and all tissues examined between 1 and 12 h after administration. After 24 h, less than 1% of the administered dose remained in the lung, kidney or liver. One day after BHT, DNA synthesis in lung increased and, on days 3, 4 and 5, was 6--8 times as high as in controls. DNA content of the lungs almost doubled. Synthesis and net increase of pulmonary DNA were dose-dependent. If BHT was given orally following injection of one single dose of urethane, adenoma formation in lung was enhanced. It is concluded that BHT, given by stomach tube and in doses higher than 100 mg/kg, produces extensive cell proliferation in mouse lung and acts as a promoting agent in adenoma development.

Adenoma↗
PubMed1977

Enhancement of urethan tumorigenesis in mouse lung by butylated hydroxytoluene.

Intraperitoneal injection of the antioxidant butylated hydroxytoluene (BHT) produces cell proliferation in mouse lungs within 2-4 days. We examined whether the presence of an increased number of proliferating lung cells would influence urethan tumorigenesis. Male Swiss-Webster mice were treated with 1 mg urethan/g before, during, or after BHT-stimulated cell growth in the lung. The number of pulmonary tumors found 13-15 weeks later was not different in BHT-treated mice compared to that in controls. On the other hand, repeated stimulation of cell growth after urethan treatment enhanced tumorigenesis. Male Swiss-Webster and A/J mice were given a single dose of urethan (1 mg/g) and, beginning 7 days later, weekly injections of BHT or corn oil. Repeated injections of BHT significantly increased the yield of lung tumors in both strains. Weekly injections of BHT into mice pretreated with 0.9% NaCl reduced the number of spontaneous pulmonary adenomas.

Animals↗