Synergistic effect of interleukin-15 and interleukin-12 on antitumor activity in a murine malignant pleurisy model - PubMed (original) (raw)
Synergistic effect of interleukin-15 and interleukin-12 on antitumor activity in a murine malignant pleurisy model
K Kimura et al. Cancer Immunol Immunother. 2000 May.
Abstract
Interleukin(IL)-15, which uses IL-2 receptor (R) beta and gamma chains for signal transduction, shares many of the biological activities of IL-2. We examined the effects of exogenous IL-15 on protection in a murine malignant pleurisy model using BALB/c mice and syngeneic MethA fibrosarcoma (MethA). Intrapleural administration of IL-15 significantly prolonged the survival time of mice after an intrapleural inoculation of MethA, whereas the same dose of IL-2 did not. The in vivo antitumor effect of IL-15 was synergistically enhanced by additive administration of IL-12. Combination therapy of IL-15 and IL-12 protected mice from death from bloody pleural fluid. Such treatment induced marked increases in the number of CD3-IL-2Rbeta+ cells corresponding to natural killer (NK) cells and the production of interferon gamma (IFNgamma) by T cells in the thoracic exudate cells (TEC). Administration of anti-IFNgamma mAb partly inhibited the protective effect of a combination of IL-15 and IL-12. A tumor-neutralizing (Winn) assay revealed that the antitumor activity of effector cells in the TEC was abrogated by treatment with anti-CD8 mAb or anti-asialoGM1 Ab plus complement. Thus, treatment with IL-15 in combination with IL-12 may enhance the activities of NK and CD8+ T cells in the TEC, providing strong antitumor activity against the malignant pleurisy. These results suggest that IL-15 together with IL-12 may have potential for the immunotherapy of some types of malignant pleurisy.
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