Dectin-2-dependent adaptive immunity governs intestinal clearance of systemic Candida albicans

Effective immunity to Candida albicans requires coordination between innate recognition and induction of adaptive CD4 T cell responses. While the C-type lectin receptor Clec4n (Dectin-2) is known to drive Th17 polarization, its role in shaping tissue-specific adaptive responses remains incompletely understood. Here, we used an OT-II antigen-specific CD4 T cell transfer model combined with OVA-expressing Candida albicans to dissect the function of Dectin-2 during systemic infection. We found that Dectin-2 is dispensable for antigen presentation and CD4 T cell priming in gut-draining lymph nodes. Moreover, we show that Dectin-2-deficient mice fail to control fungal growth in the intestinal mucosa, despite elevated local production of IL-17A and GM-CSF. The increased susceptibility of the Dectin-2-deficient mice was associated with impaired neutrophil activation in the intestinal mucosa. These findings identify a tissue-specific checkpoint role for Dectin-2, linking balanced adaptive Th17 cytokine responses to granulocyte function, and revealing a previously unappreciated mechanism required for anti-fungal immune regulation at intestinal mucosal surface.