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Neutrophils are key innate immune effector cells that are essential to fighting bacterial and fungal pathogens. Here we report that mice carrying a hematopoietic lineage-specific deletion of Jagn1 (encoding Jagunal homolog 1) cannot mount an efficient neutrophil-dependent immune response to the human fungal pathogen Candida albicans. Global glycobiome analysis identified marked alterations in the glycosylation of proteins involved in cell adhesion and cytotoxicity in Jagn1-deficient neutrophils. Functional analysis confirmed marked defects in neutrophil migration in response to Candida albicans infection and impaired formation of cytotoxic granules, as well as defective myeloperoxidase release and killing of Candida albicans. Treatment with granulocyte/macrophage colony-stimulating factor (GM-CSF) protected mutant mice from increased weight loss and accelerated mortality after Candida albicans challenge. Notably, GM-CSF also restored the defective fungicidal activity of bone marrow cells from humans with JAGN1 mutations. These data directly identify Jagn1 (JAGN1 in humans) as a new regulator of neutrophil function in microbial pathogenesis and uncover a potential treatment option for humans.

Jagunal homolog 1 is a critical regulator of neutrophil function in fungal host defense