Abstract
In immunocompetent mice with candidiasis, successful therapy with amphotericin B and fluconazole relies on the induction of protective, T helper (Th) type 1 responses, an effect potentiated by concomitant interleukin (IL)-4 neutralization. To assess the therapeutic efficacy of combined treatments with antifungals and immunomodulators in conditions of immunosuppression, leukopenic or neutropenic mice with disseminated candidiasis were treated with amphotericin B or fluconazole alone or in combination with soluble IL-4 receptor (sIL-4R) or recombinant (r) IL-12 or IL-10 neutralizing monoclonal antibodies. We found that (1) the synergistic effect of sIL-4R and antifungals is retained in immunocompromised mice; (2) synergism with amphotericin B was superior to that with fluconazole, particularly in leukopenic mice; (3) rIL-12 synergized with fluconazole in neutropenic mice; and (4) IL-10 neutralization was always of limited efficacy. This study indicates that the therapeutic efficacy of antifungals is differentially potentiated by cytokines or cytokine antagonists and is influenced by host immune reactivity.
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