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Hepatic Toxicity and Recovery of Fischer 344 Rats Following Exposure to 2-Aminoanthracene by Intraperitoneal Injection

Department of Veterinary Pathology, dbaker{at}mail.vetmed.lsu.edu

H. Wayne Taylor

Department of Veterinary Pathology

Stephen P. Lee

Department of Veterinary Pathology

Steven A. Barker

Department of Veterinary Physiology, Pharmacology and Toxicology, School of Veterinary Medicine, Louisiana State University, Baton Rouge, Louisiana 70803

Mary E.P. Goad

Department of Veterinary Pathology

Jay C. Means

Department of Veterinary Pathology, Department of Chemistry, Western Michigan University, Kalamazoo, Michigan 49008

Humans may be exposed to 2-aminoanthracen e (2-AA), a substituted polycyclic aromatic hydrocarbon, and a recognized mutagen and carcinogen, through oral and respiratory routes from contact with a variety of environmental sources. For the present study, we sought to evaluate hepatic damage and recovery in Fischer 344 rats following multiple IP injections of 5 mg of 2-AA. Rats were injected weekly for up to 5 weeks. Subgroups were then allowed to recover for 1, 5, or 9 weeks, and biochemical and pathologic changes were evaluated. We observed that weight gains were reduced relative to controls for all groups receiving 2 injections. Serum enzyme levels indicative of liver damage were evident and included alterations in serum aspartate aminotransferase, alkaline phosphatase, total protein, albumin, and globulin. These alterations usually returned to normal by 5 weeks following cessation of 2-AA administration. In contrast, histologic liver changes, including hepatocyte hypertrophy, biliary hyperplasia with oval cell proliferation, altered foci, nodular hyperplasia, and one hepatocellular adenoma became more severe with time. This experiment demonstrates patterns of hepatic damage and recovery in rats exposed to 2-AA.

Key Words: Animal model • arylamine • liver • polycyclic aromatic hydrocarbon (PAH)

Toxicologic Pathology, Vol. 29, No. 3, 328-332 (2001)
DOI: 10.1080/019262301316905282


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