Modifying effects of 1,2-dichloropropane on N-nitrosobis(2-oxopropyl)amine-induced cholangiocarcinogenesis in male Syrian hamsters.

Abstract

Based on the findings of epidemiological studies in Japan that occupational exposure to 1,2-dichloropropane (1,2-DCP) was associated with increased cholangiocarcinomas, 1,2-DCP has recently been classified as being carcinogenic to humans (Group 1). However, the cholangiocarcinogenicity of 1,2-DCP has not been demonstrated experimentally, and it was negative for cholangiocarcinogenicity in rats and mice. The present study determined the effects of 1,2-DCP on N-nitrosobis(2-oxopropyl)amine (BOP)-induced cholangiocarcinogenesis in male hamsters. We found that 1,2-DCP did not enhance the development of BOP-induced atypical biliary hyperplasia and did not induce any lesions in liver bile duct when administered alone. Notably, 1,2-DCP had no effect on the proliferative activity of bile duct epithelial cells regardless of BOP-initiation. These results demonstrate that 1,2-DCP lacks promoting effects on BOP-induced cholangiocarcinogenesis and suggest the possibility that 1,2-DCP is not cholangiocarcinogenic to the hamster in the present model. In addition, 1,2-DCP also lacks promoting effects on pancreatic, lung, and renal carcinogenesis. As the occurrence of occupational cholangiocarcinomas in Japan might be attributed to exposure to multiple chemicals, the results of the present study indicate that it will be necessary to determine the cholangiocarcinogenic effects of concurrent exposure of 1,2-DCP and the other halogen solvents to which workers with cholangiocarcinomas were exposed.

• Authors: Min Gi, Masaki Fujioka, Shotaro Yamano, Eri Shimomura, Masayuki Kanki, Satoko Kawachi, Hirokazu Tachibana, Kumiko Tatsumi, He Fang, Naomi Ishii, Anna Kakehashi, Hideki Wanibuchi
• Journal: The Journal of toxicological sciences (J Toxicol Sci) Vol. 40 Issue 5 Pg. 647-56 ( 2015) ISSN: 1880-3989 [Electronic] Japan
• PMID: 26354381 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Nitrosamines
• Solvents
• nitrosobis(2-oxopropyl)amine
• propylene dichloride
• Propane

Topics

• Animals
• Bile Duct Neoplasms (chemically induced)
• Cholangiocarcinoma (chemically induced)
• Disease Models, Animal
• Male
• Mesocricetus
• Nitrosamines
• Occupational Exposure (adverse effects)
• Propane (adverse effects, analogs & derivatives)
• Solvents