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A Review of Chronic Inhalation Studies with Mainstream Cigarett Smoke in Rats and Mice
Christopher R. E. Coggins
Lorillard Tobacco Co., Greensboro, North Carolina 27408-7018
In this paper, I review the results of a representative selection of chronic inhalation studies with rats and mice exposed to mainstream cigarette smoke and describe the inhalation exposures and the histopathological changes reported by various authors. Many of the studies used nose-only exposure systems, whereas others simply used large whole-body chambers. Smoke-induced epithelial hypertrophy, hyperplasia, and squamous metaplasia were reported in the conducting airways in most of the studies, along with increased numbers of intra-alveolar macrophages that were occasionally associated with alveolar metaplasia. Lung adenomas and adenocarcinomas were reported in only a few of the studies. No statistically significant increase in the incidence of malignant lung tumors was seen in either species as a result of smoke exposure, a finding that does not agree with the results of epidemiological studies in humans. Possible reasons for this lack of correlation are given.
Key Words: Cigarette smoke • inhalation toxicology • rodent respiratory tract
Toxicologic Pathology, Vol. 26, No. 3,
307-314 (1998)
DOI: 10.1177/019262339802600301
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