Candida parapsilosis complex induces local inflammatory cytokines in immunocompetent mice.

Abstract

Despite the increasing incidence of the Candida parapsilosis complex in the clinical setting and high mortality rates associated with disseminated infection, the host-fungus interactions regarding Candida parapsilosis sensu stricto and the closely related species C. orthopsilosis and C. metapsilosis remains blurred. In this study, we analyzed inflammatory cytokines levels and histopathology as well as fungal burden in spleen, kidney and lung of mice infected with six strains of the "psilosis" group with different enzymatic profiles. Strong interleukin 22 (IL-22) and tumor necrosis factor α (TNF-α) responses were observed in analyzed organs from infected mice (P<.0001) regardless of the species and enzymatic profile. TNF-α and IL-22 levels were related with spleen inflammation and fungal load. Fungal cells were detected only in spleen and kidney of infected mice, especially by day 2 post-challenge. The kidney showed glomerular retraction and partial destruction of renal tubules. Our data suggest that a strong inflammatory response, mainly of IL-22 and TNF-α, could be involved in Candida parapsilosis complex infection control.