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Subchronic hepatotoxicity evaluation of bromobenzene in Fischer 344 rats
Author(s) -
Dodd Darol E.,
Pluta Linda J.,
Sochaski Mark A.,
Banas Deborah A.,
Thomas Russell S.
Publication year - 2013
Publication title -
journal of applied toxicology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.784
H-Index - 87
eISSN - 1099-1263
pISSN - 0260-437X
DOI - 10.1002/jat.2732
Subject(s) - corn oil , bromobenzene , toxicity , hepatocyte , histopathology , muscle hypertrophy , medicine , centrilobular necrosis , endocrinology , body weight , chemistry , pathology , biochemistry , in vitro , catalysis
Male Fischer 344 (F344) rats were exposed to bromobenzene (BB) for 5 days and 2, 4 and 13 weeks. BB was administered by gavage (corn oil vehicle) at doses of 0, 25, 100, 200, 300 and 400 mg kg −1 per day. Endpoints evaluated included clinical observations, body weights, liver weights, serum chemistry, blood BB, gross pathology and liver histopathology. There were no BB exposure‐related clinical signs of toxicity. Mean body weight decreased by 5–10% compared with control in the 400 mg kg −1 per day group. Liver weight increases were dose‐ and exposure time‐related and statistically significant at ≥25 mg kg −1 per day. Incidence and severity of centrilobular cytoplasmic alteration and hepatocyte hypertrophy were related to dose and exposure time. At early time points (5 days and 2 weeks), centrilobular inflammation, including granulomatous areas, and necrotic and anisokaryocytic hepatocytes were observed in rats of the two highest BB dose groups. Blood BB concentrations increased linearly with dose and at 13 weeks ranged from 8 to 136 µg ml −1 (25–400 mg kg −1 per day). In conclusion, rats administered BB doses up to 400 mg kg −1 per day for up to 13 weeks had mild liver effects. A NOAEL of 200 mg kg −1 per day was selected based on the statistically significant incidence of hepatocyte hypertrophy at doses ≥ 400 mg kg −1 per day. Copyright © 2012 John Wiley & Sons, Ltd.