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Abstract
The secretion of interleukins (IL-18, IL-12) and Nitric Oxide (NO) by peritoneal macrophages from hamsters bearing two lines of transplantable melanoma was estimated. Macrophages of animals with melanoma lines secreted less IL-18 but more IL-12 and NO in comparison with the control macrophages. The distinctly higher cytotoxic activity of macrophages from animals with amelanotic line in comparison with the melanotic line was not accompanied by significant differences in the IL-18 and IL-12 secretion between studied groups of macrophages. Thus, it seems that IL-18 play the role in innate immunity but not in adaptive cellular immunity, whereas IL-12 and NO take part in macrophages tumoricidal activity.