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Species differences in short term toxicity from inhalation exposure to bromobenzene

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Abstract

Lung, liver and kidney injury were studied in mice, rats and rabbits 48 h after termination of a 4 h inhalation exposure to bromobenzene vapour (250–3400 ppm). Light and electron microscopy of lung tissue revealed injury to Clara cells and adjacent epithelium in mouse bronchioli (bromobenzene concentration 250 ppm and 1000 ppm) and to Clara cells of rat bronchi and bronchioli (1000 ppm bromobenzene) and of rabbit bronchi (2500 ppm and 3400 ppm). Histological and clinicochemical indices of liver damage were found in the same animals, whereas kidney toxicity was observed in mice (two out of ten showed tubular necrosis and elevated concentration of plasma urea) and rats (all had elevated plasma concentrations of creatinine) exposed to 1000 ppm bromobenzene. Inhalation exposure thus produced less kidney injury than expected from previous studies with equimolar doses given intraperitoneally. The mouse was the most severely affected species, followed by the rat, and lastly the rabbit. The animal susceptibility could not be ranked according to the rate of14C-bromobenzene covalent binding in lung or liver, but it was inversely related to the rate of N-demethylation of benzphetamine (indicative of P450IIB activity) in both lung and liver microsomal preparations. Differences in a P450 mediated detoxification could therefore be of importance in species variability to bromobenzene injury.

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Author notes

  1. Jon Einar Dahl

    Present address: NIOM-Scandinavian Institute of Dental Materials, P. O. Box 70, N-1344, Haslum, Norway

Authors and Affiliations

  1. Department of Environmental Medicine, National Institute of Public Health, Geitmyrsveien 75, N-0462, Oslo 4, Norway

    Jon Einar Dahl, Rune Becher & Erik Dybing

  2. Department of Pharmacology and Toxicology, Faculty of Medicine, University of Trondheim, N-7006, Trondheim, Norway

    Kjell Aarstad & Odd G. Nilsen

Authors
  1. Jon Einar Dahl
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  2. Rune Becher
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  3. Kjell Aarstad
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  4. Odd G. Nilsen
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  5. Erik Dybing
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Dahl, J.E., Becher, R., Aarstad, K. et al. Species differences in short term toxicity from inhalation exposure to bromobenzene. Arch Toxicol 64, 370–376 (1990). https://doi.org/10.1007/BF01973458

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  • DOI: https://doi.org/10.1007/BF01973458

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