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Monocytes and macrophages are the cell types most commonly associated with the innate immune response against Candida albicans infection. Interactions between the host immune system and Candida organisms have been investigated for planktonic Candida cells, but no studies have addressed these interactions in a biofilm environment. In this study, for the first time, we evaluated the ability of C. albicans to form biofilms in the presence or absence of adherent peripheral blood mononuclear cells (PBMCs; enriched for monocytes and macrophages by adherence). Our analyses using scanning electron and confocal scanning laser microscopy showed that the presence of PBMCs enhanced the ability of C. albicans to form biofilms and that the majority of PBMCs were localized to the basal and middle layers of the biofilm. In contrast to the interactions of PBMCs with planktonic C. albicans, where PBMCs phagocytose fungal cells, PBMCs did not appear to phagocytose fungal cells in biofilms. Furthermore, time-lapse laser microscopy revealed dynamic interactions between C. albicans and PBMCs in a biofilm. Additionally, we found that (i) only viable PBMCs influence Candida biofilm formation, (ii) cell surface components of PBMCs did not contribute to the enhancement of C. albicans biofilm, (iii) the biofilm-enhancing effect of PBMCs is mediated by a soluble factor released into the coculture medium of PBMCs with C. albicans, and (iv) supernatant collected from this coculture contained differential levels of pro- and anti-inflammatory cytokines. Our studies provide new insight into the interaction between Candida biofilm and host immune cells and demonstrate that immunocytes may influence the ability of C. albicans to form biofilms.

infection and immunity

Interaction of<i>Candida albicans</i>with Adherent Human Peripheral Blood Mononuclear Cells Increases<i>C. albicans</i>Biofilm Formation and Results in Differential Expression of Pro- and Anti-Inflammatory Cytokines

Interaction ofCandida albicanswith Adherent Human Peripheral Blood Mononuclear Cells IncreasesC. albicansBiofilm Formation and Results in Differential Expression of Pro- and Anti-Inflammatory Cytokines