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• W2055770667 abstract "Among the different chemicals present in tobacco and tobacco smoke, 4-(methylnitrosamine)-1-(3-pyridyl)-1-butanone (NNK) is the most potent carcinogen. In the present study the immunosuppressive effect of NNK was investigated in laboratory animals by analyzing the antitumor immune responses. Mice of B6C3F1 strain were treated with different doses of NNK by IP and assayed for natural killer cell activity by the lysis of 51Cr-labeled YAC-1 lymphoma cells. The control mice received physiological saline. The results showed a significant inhibition of natural killer cell activity in the spleen cells of mice treated with 100 or 250 mg/kg NNK. In contrast to the high-dose NNK group, treatment of mice with lower doses of NNK like 10 or 50 mg/kg had no significant effect on the natural killer cell activity. In addition to spleen, the natural killer cell activity was also suppressed in the hilar lymph nodes and lung cells of NNK-treated mice. The clearance of 125I labeled YAC-1 tumor cells was also reduced from the lungs of mice injected with NNK. Further, the metastatic potential of B16F10 melanoma cells was significantly higher, as evidenced by the increased lung tumor nodules in the high-dose NNK-treated mice. The decreased antitumor immune response in the carcinogen-treated mice was not due to a decrease of NK cells, because flow cytometric analysis indicated no change in the frequency of NK 1.1+ cells between control and treated animals. However, there was an increased plasma cortisone levels in the carcinogen-treated mice compared to control animals. Injection of mice with poly I:C or interleukin-12 was able to restore natural killer cell activity in the tobacco carcinogen-treated mice." @default.
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• W2055770667 date "1999-01-15" @default.
• W2055770667 modified "2023-09-23" @default.
• W2055770667 title "INHIBITION OF NATURAL KILLER CELL ACTIVITY IN MICE TREATED WITH TOBACCO SPECIFIC CARCINOGEN NNK" @default.
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• W2055770667 doi "https://doi.org/10.1080/009841099158196" @default.
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