Abstract:
:A six-month bioassay in A/J mice was conducted to test the hypothesis that chronically inhaled mainstream cigarette smoke would either induce lung cancer or promote lung carcinogenicity induced by the tobacco-specific nitrosamine, 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK). Groups of 20 female A/J mice were exposed to filtered air (FA) or cigarette smoke (CS), injected with NNK, or exposed to both CS and NNK. At 7 weeks of age, mice were injected once with NNK; 3 days later, they were exposed to CS for 6 h/day, 5 days/week, for 26 weeks at a mean 248 mg total particulate matter/m3 concentration. Animals were sacrificed 5 weeks after exposures ended for gross and histological evaluation of lung lesions. No significant differences in survival between exposure groups was observed. A biologically significant level of CS exposure was achieved as indicated by CS-induced body weight reductions, lung weight increases, and carboxyhemoglobin levels in blood of about 17%. Crude tumor incidences, as determined from gross observation of lung nodules, were similar between the CS-exposed and FA groups, and the NNK and CS + NNK groups. Incidences in either of these latter groups were greater than either the CS or FA groups. Furthermore, tumor multiplicity in tumor-bearing animals was not significantly different among any of the three groups (FA, NNK, CS + NNK) in which tumors were observed. Thus, CS exposure neither induced lung tumors nor promoted NNK-induced tumors. Because the CS exposure concentration was probably near the maximally tolerable level, longer exposures should be evaluated to potentially establish a CS-induced model of lung carcinogenesis in the A/J mouse.
journal_name
Cancer Lettjournal_title
Cancer lettersauthors
Finch GL,Nikula KJ,Belinsky SA,Barr EB,Stoner GD,Lechner JFdoi
10.1016/0304-3835(95)04059-5subject
Has Abstractpub_date
1996-02-06 00:00:00pages
161-7issue
2eissn
0304-3835issn
1872-7980pii
0304383595040595journal_volume
99pub_type
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