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© 1995 Oxford University Press

research-article

Promotion of N-nitrosodimethylamine-initiated mouse lung tumors following single or multiple low dose exposure to 2,3,7,8-tetrachlorodibenzo-p-dioxin

Lisa E. Beebe 1, Miriam R. Anver 2, Charles W. Riggs 3, Laura W. Fornwald 4 and Lucy M. Anderson

Laboratory of Comparative Carcinogenesis Frederick, MD 21702, USA
2Pathology Histotechnology Laboratory, PRI/DynCorp Frederick, MD 21702, USA
3Data Management Services Inc. Frederick, MD 21702, USA
4Biological Carcinogenesis and Development Program, PRI/Dyn Corp, National Cancer Institute-Freederick Cancer Research and Development Center Frederick, MD 21702, USA

1To whom Correspondence should be addressed

The environmental contaminant, 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD), is highly toxic to several rodent species and may have adverse health effects in exposed human populations. Further, TCDD has been shown to be a potent liver tumor promoter in the rat after repeated administration. These studies were conducted to determine the tumor promoting capability of TCDD in the Swiss mouse following single or multiple exposures. Following tumor initiation with N-nitrosodimethylamine (NDMA; 25 mg/kg), animals were given either a single dose (1.6, 16 or 48 µg/kg) or repeated injections (0.05 µg/kg/week for 20 weeks) of TCDD and sacrificed at 52 weeks of age. Neither NDMA nor TCDD caused an increase in incidence of liver tumors. NDMA induced lung tumors in 100% of animals, with 12 ± 0.1 tumors/mouse. The multiplicity of lung tumors was significantly increased by low dose TCDD treatment, with 20 ± 2.6 tumors/mouse following a single 1.6 µg/kg dose (P = 0.016) and 18 ± 1.7 (P = 0.031) following repeated 0.05 (µg/kg doses (x20). Higher doses of TCDD did not increase multiplicity of lung tumors and, in fact, may have been toxic to the lungs of NDMA-treated mice, as evidenced by the infiltration of pigmented macrophages. These data demonstrate the potent tumor promoting capability of TCDD in mouse lung.


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