Revised rat multi-organ carcinogenesis bioassay for whole-body detection of chemopreventive agents: modifying potential of S-methylcysteine.

Abstract

The DMBDD rat multi-organ carcinogenesis model based on two-stage carcinogenesis theory was revised to make more suitable assay system for detecting chemopreventive effects of chemical substances by increasing the doses of two carcinogens, 1,2-dimethylhydrazine dihydrochloride (DMH) and N-butyl-N-(4-hydroxybutyl)nitrosamine (BBN). The revised bioassay resulted in increasing preneoplastic or neoplastic lesions in the colon, urinary bladder and liver. S-Methylcysteine (SMC), a water-soluble organosulfur compound, was used as a test chemical in the new initiation regimen. Though SMC did not express clear-cut inhibitory effects in tumor levels, it showed modifying effects on the development of lung hyperplastic and colon preneoplastic lesions. In conclusion, the present model featuring high yields of preneoplastic and neoplastic lesions with low mortality in a short period (30 weeks), might be suitable for testing the efficacy of possible chemopreventive chemicals at the whole-body level.

• Authors: Kenichiro Doi, Hideki Wanibuchi, Elsayed I Salim, Jun Shen, Min Wei, Makoto Mitsuhashi, Shinzoh Kudoh, Kazuto Hirata, Shoji Fukushima
• Journal: Cancer letters (Cancer Lett) Vol. 206 Issue 1 Pg. 15-26 (Mar 31 2004) ISSN: 0304-3835 [Print] Ireland
• PMID: 15019155 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Alkylating Agents
• Carcinogens
• Diethylnitrosamine
• S-methylcysteine
• Glutathione Transferase
• 1,2-Dimethylhydrazine
• Cysteine

Topics

• 1,2-Dimethylhydrazine (toxicity)
• Alkylating Agents (toxicity)
• Animals
• Biological Assay (methods)
• Carcinogens (toxicity)
• Chemoprevention (methods)
• Colon (drug effects, enzymology, pathology)
• Cysteine (analogs & derivatives, pharmacology)
• Diethylnitrosamine (toxicity)
• Drug Screening Assays, Antitumor (methods)
• Glutathione Transferase (analysis)
• Liver (drug effects, enzymology, pathology)
• Lung (drug effects, enzymology, pathology)
• Male
• Neoplasms, Experimental (chemically induced, pathology)
• Organ Specificity (drug effects)
• Rats
• Rats, Inbred F344