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Objective: To investigate the antitumor mechanisms of the streptococcal preparation OK-432. Methods: Using C57BL/6 mouse bearing B16 melanoma, we observed the antitumor activity of OK-432 and investigated the effect of OK-432 on multi-cytokine (IL-2, IL-4, IL-6, IL-10, IL-12, IFN-() production of mouse splenocyte both in vitro and in vivo. Results: As compared with control, OK-432 significantly inhibited B16 melanoma growth and lengthened mice survival time (P<0.05). In vitro OK-432 could stimulate splenocyte from tumor bearing mice to secrete IL-6, IL-12, IFN-( and IL-10 remarkably (P<0.01). In vivo OK-432 led to the increased production of IL-2, IL-12 and IFN-( but decreased production of IL-10 (P<0.05). When the splenocytes harvested from OK-432 treated mice were stimulated with OK-432 again in vitro, the production of IFN-( increased and IL-10 decreased significantly (P<0.05). Conclusion: OK-432 could boost multiple cytokines production, especially IL-12 which skewed T cells in a Th1 dominant state and enhanced the host antitumor activities.
