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© 1986 Oxford University Press

research-article

The Subchronic Oral Toxicity of the ß-Isomer of Hexachiorocyclohexane in Rats

F. L. VAN VELSEN*, L. H. J. C. DANSE**, F. X. R. VAN LEEUWEN*, J. A. M. A. DORMANS** and M. J. VAN LOGTEN{dagger}

*Laborazorv of General Toxicology Bilthoven. The Netherlands **National Institute of Public Health and Environmental Hygiene Bilthoven, The Netherlands

The Subchronic Oral Toxicity of the ß-Isomer of Hexachlorocyclohexane in Rats VAN VELSEN, F. L., DANSE, L. H. J. C., VAN LEEUWEN, F. X. R., DORMANS, J. A. M. A., AND VAN LOGTEN, M. J. (1986). Fundam. Appl. Toxicol. 6, 697–712. The 13-week oral toxicity of ß-HCH, a non pesticidal isomer of hexachlorocyclohexane, was investigated in rats with doses of 0,2, 10, 50, or 250 mg/kg feed. Parameters studied comprised clinical signs, growth and food intake, biochemistry, hematology, organ weights, and histopathology. In all dose groups liver effects comprising increase of organ weight, centrilobular hepatocytic hypertrophy, and proliferation of smooth endoplasmic reticulum or increased activity of microsomal enzymes, were observed. In the 50 mg/kg group the weights of thymus and testes were affected. In the highest dose group, progressive clinical signs leading to the unscheduled sacrifice of approximately 50% of the rats were observed. Moreover, in the males of this group atrophy of the testes, characterized by a reduced size of the seminiferous tubules and a decreased number of interstitial cells was observed in association with spermatogrnic arrest. The females in this group showed atrophy of the ovaries with impaired oogenesis and focal hyperplasia and metaplastic changes of the endometrial epithelium. These effects are discussed with respect to a possible estrogenic action of ß-HCH.


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