Investigations of the genotoxicity and cell proliferative activity of dichlorvos in mouse forestomach

Toxicology
D J BenfordJ N Bremmer

Abstract

This study investigated the possible mechanism by which dichlorvos may have caused forestomach tumours in mice in a chronic corn oil gavage cancer bioassay [NTP (1989) Toxicology and carcinogenesis studies of dichlorvos in F344/N rats and B6C3F1 mice (gavage studies). National Toxicology Program Technical Report 342, NIH Publ. No 89-2598]. For this purpose, a method has been developed to assess the genotoxicity of irritant substances on mouse forestomach epithelium. Groups of five B6C3F1 mice were given a single oral dose of dichlorvos, the genotoxic forestomach carcinogen 1-methyl-3-nitro-1-nitrosoguanidine (MNNG) or the irritant, non-genotoxic forestomach carcinogen butylated hydroxyanisole (BHA). After periods of 2-48 h, three parameters were assessed: unscheduled DNA synthesis (UDS) by autoradiography of tissue sections, replicative DNA synthesis (RDS) also by autoradiography of incorporated [3H]thymidine, and histopathological changes, including hyperplasia. MNNG induced UDS but not RDS or hyperplasia in forestomach epithelium, consistent with its genotoxic mode of action. BHA and dichlorvos did not induce UDS, consistent with absence of genotoxic activity in the forestomach after in vivo exposure. In contrast, BHA and dic...Continue Reading

References

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Citations

Jul 24, 2012·Chemical Research in Toxicology·Aditya SunkariaKiran Dip Gill
Mar 15, 2000·Regulatory Toxicology and Pharmacology : RTP·G Van Maele-FabryJ L Willems
Aug 7, 1998·Regulatory Toxicology and Pharmacology : RTP·J H Mennear
Jan 28, 2006·Regulatory Toxicology and Pharmacology : RTP·John IshmaelAnn Manley
May 11, 2018·Drug and Chemical Toxicology·Eyyüp Rencüzoğulları, Muhsin Aydın

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