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The Journal of Immunology, Vol 157, Issue 12 5512-5520, Copyright © 1996 by American Association of Immunologists
ARTICLES |
M Huang, S Sharma, JT Mao and SM Dubinett
Department of Medicine, Johnson Comprehensive Cancer Center, University of California-Los Angeles School of Medicine, 90073, USA.
Studies suggest that IL-10 may contribute to tumor-associated immunosuppression. In the current study we evaluated the capacity of human non-small cell lung cancer (NSCLC) cell lines to induce PBL IL-10 production. We observed a 10- to 100-fold increase in human PBL IL-10 production following exposure to NSCLC cell supernatants. The tumor- induced increase in PBL IL-10 production was partially blocked by pretreatment of the tumors with the PG inhibitor indomethacin. NSCLC lines were found to constitutively produce PGE2. Exogenous PGE2 also induced PBL IL-10 production in a dose- and time-dependent manner. Both PGE2 and NSCLC supernatant-induced PBL IL-10 production were due to an increase in the IL-10 mRNA transcriptional rate. To evaluate the significance of tumor-induced lymphocyte IL-10 production, the capacity of PBL to produce IFN-gamma during culture in tumor supernatants was assessed in the presence of specific anti-IL-10 mAb. We found enhanced PBL IFN-gamma production following anti-IL-10 treatment. These in vitro studies imply that NSCLC-induced PBL IL-10 production may serve to shift the Th1/Th2 cytokine axis at the tumor site and thus inhibit cell- mediated anti-tumor immune responses. These findings identify a mechanism by which lung cancer cells may escape host immune surveillance. We conclude that NSCLC-derived soluble mediators, including PGs, may play an immunoregulatory role through induction of lymphocyte IL-10 production.
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