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• W2052837621 abstract "The toxicity of arsenic compounds is highly dependent on the valence and methylation state of the compound. Although there is extensive published literature on the potential developmental toxicity of inorganic arsenic compounds, little exists on organic arsenic compounds and, in particular, studies conducted in accordance with conventional regulatory guidelines appropriate for risk assessment are rare. The organic arsenic compounds, monomethylarsonic acid (MMAV) and dimethylarsinic acid (DMAV, also called cacodylic acid), are the active ingredients in pesticide products that are used mainly for weed control. MMAV and DMAV are also metabolites of inorganic arsenic formed intracellularly by most living organisms (animals, plants and bacteria). In mammals, this occurs predominantly in liver cells.Conventional developmental toxicity studies of orally administered MMAV and DMAV in the Sprague-Dawley rat and New Zealand White rabbit were conducted in commercial contract laboratories in the late 1980 s for regulatory compliance. The results of these studies are summarized and presented to broaden the data available in the public domain.In both species, data shows an absence of dose-related effects at organic arsenic exposures that were not maternally toxic. MMAV doses of 0, 10, 100, and 500 mg/kg/day (rat) and 0, 1, 3, 7, and 12 mg/kg/day (rabbit) and DMAV doses of 0, 4, 12, and 36 mg/kg/day (rat) and 0, 3, 12, and 48 mg/kg/day (rabbit) were administered by oral gavage daily during organogenesis (Gestation Day [GD] 6-15, rat; GD 7-19, rabbit) and the litters examined at maternal sacrifice (GD 20, rat; GD 29, rabbit). After treatment with MMAV, maternal and fetal toxicity were observed at the highest doses of 500 mg/kg/day (rat) and 12 mg/kg/day (rabbit), but no treatment-related developmental toxicity at the lower doses, even in the presence of minimal maternal toxicity in the rat at 100 mg/kg/d. There was no evidence of teratogenicity associated with MMAV treatment. With DMAV, maternal and developmental toxicity were observed in the rat at 36 mg/kg/day, with a higher than spontaneous incidence of fetuses with diaphragmatic hernia. In the rabbit at 48 mg/kg/day, there was marked maternal toxicity, culminating for most females in abortion and with no surviving fetuses for evaluation. There was no treatment-related maternal or developmental toxicity in the rat or rabbit at 12 mg/kg/day. Based on pregnancy outcome, the developmental toxicity no observed adverse effect level (NOAEL) for orally administered MMAV were 100 and 7 mg/kg/day in the rat and rabbit, respectively, and for DMAV were 12 mg/kg/day in both species.Margins of exposure estimated based on conservative estimates of daily intakes of arsenic in all of its forms indicate that exposure to MMAV or DMAV at environmentally relevant exposure levels, by the oral route (the environmentally relevant route of exposure) is unlikely to pose a risk to pregnant women and their offspring." @default.
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• W2052837621 date "2006-02-01" @default.
• W2052837621 modified "2023-10-07" @default.
• W2052837621 title "Monomethylarsonic acid and dimethylarsinic acid: developmental toxicity studies with risk assessment" @default.
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• W2052837621 doi "https://doi.org/10.1002/bdrb.20065" @default.
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