Toxicologic Pathology

 

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Toxicologic Pathology, Vol. 29, No. 4, 451-457 (2001)
DOI: 10.1080/01926230152499809

Toxicosis Associated with Dual Oral Exposure of Rats to Lead and Trichloroethylene

Jack Nunes

Department of Biomedical Sciences and Pathobiology, Virginia-Maryland Regional College of Veterinary Medicine, Blacksburg, Virginia 24061

Marion Ehrich

Department of Biomedical Sciences and Pathobiology, Virginia-Maryland Regional College of Veterinary Medicine, Blacksburg, Virginia 24061, marion{at}vt.edu

John Robertson

Department of Biomedical Sciences and Pathobiology, Virginia-Maryland Regional College of Veterinary Medicine, Blacksburg, Virginia 24061

To determine if additive or synergistic toxic effects would occur, adult male rats were exposed orally to lead carbonate (2,000 mg/kg) for 9 days before trichloroethylene (TCE), 2,000 mg/kg, was given concurrently for an additional 7 days. Comparisons were made with groups of vehicle-treated rats and rats given only lead or only TCE. Potential neurotoxicity was evaluated by using the Functional Observational Battery (FOB) recommended for neurotoxicity screening. Rats were sacrifi ced on day 16, and brain, testes, spleen, kidney/adrenals, heart, and liver weighed and observed for pathological changes. Results of the FOB indicated that lead carbonate was more responsible than TCE for changes observed. Additive or synergistic neurotoxicities were not noted. Histological examination of the kidney from lead-treated rats revealed inclusions, an increased incidence of coagulated proteins, and tubular dilation that was generally more severe in the medullary segments. Gastric and testicular necrosis were found in rats given lead carbonate both with and without TCE (15/20 and 6/20 treated, respectively). The results suggest that, even when given concurrently, the toxicities of lead carbonate and TCE are expressed only as though one toxicant was given.

Key Words: Neurotoxicity • trichloroethylene • lead • lead carbonate • FOB.


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