Endogenous interleukin (IL)-1 alpha and IL-1 beta are crucial for host defense against disseminated candidiasis

The Journal of Infectious Diseases
Alieke G VonkBart Jan Kullberg

Abstract

Interleukin (IL)-1 alpha and IL-1 beta are protective proinflammatory cytokines involved in host defense against Candida albicans. It is, however, unknown whether they provide protection through similar mechanisms. We investigated the effect of endogenous IL-1 alpha and IL-1 beta on disseminated C. albicans infection. Mice deficient in the genes encoding IL-1 alpha (IL-1 alpha-/-), IL-1 beta (IL-1 beta-/-), or both molecules (IL-1 alpha-/- beta-/-) were used. Survival and C. albicans outgrowth in the kidneys was assessed after intravenous injection of C. albicans. Both mortality and C. albicans outgrowth in the kidneys were significantly increased in IL-1 alpha-/- and IL-1 beta-/- mice, compared with those in control mice, with the IL-1 alpha-/- beta-/- mice being most susceptible to disseminated candidiasis. The host defense mechanisms triggered by IL-1 alpha and IL-1 beta differed from one another. IL-1 beta-/- mice showed decreased recruitment of granulocytes in response to an intraperitoneal C. albicans challenge, and generation of superoxide production was diminished in IL-1 beta-/- granulocytes. IL-1 alpha-/- mice had a reduced capacity to damage C. albicans pseudohyphae. Protective type 1 responses were deficient in both...Continue Reading

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