Schulte A, Ernst H, Peters L, Heinrich U. Induction of squamous cell carcinomas in the mouse lung after long-term inhalation of polycyclic aromatic hydrocarbon-rich exhausts.
EXPERIMENTAL AND TOXICOLOGIC PATHOLOGY : OFFICIAL JOURNAL OF THE GESELLSCHAFT FUR TOXIKOLOGISCHE PATHOLOGIE 1994;
45:415-21. [PMID:
8167464 DOI:
10.1016/s0940-2993(11)80369-6]
[Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
A 10-month inhalation study using newborn female mice was performed to determine pulmonary tumorigenicity of polycyclic aromatic hydrocarbon (PAH)-enriched exhausts. At two exhaust doses containing 50 micrograms/m3 (group II) and 90 micrograms/m3 benzo(a)pyrene (BaP) (group III) a significant increase of lung tumors was observed and the incidence of malignant lung tumors was dose-dependent. Bronchiolo-alveolar adenomas were observed in all mice of groups II and III (40/40 each) as compared to 5/40 in the control (group I). Bronchiolo-alveolar adenocarcinomas developed in 10/40 and in 33/40 mice of groups II and III, respectively, but were absent in group I. Single or multiple squamous cell carcinomas, which showed variable degrees of differentiation were observed exclusively in 6 mice of group III. One adenosquamous carcinoma was seen in an further animal of this group.
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