Aspergillus fumigatus is a ubiquitous, yet potentially pathogenic, mold. The immune system employs innate receptors, such as
dectin-1, to recognize fungal pathogens, but the immunological networks that afford protection are poorly explored. Here, we investigated the role of
dectin-1 in anti-A. fumigatus response in an experimental model of acute invasive
aspergillosis. Mice lacking
dectin-1 presented enhanced signs of
inflammation, with increased production of inflammatory
cytokines and neutrophil infiltration, quickly succumbing to the
infection. Curiously, resistance did not require T/B lymphocytes or
IL-17. Instead, the main effector function of
dectin-1 was the preservation of the NK cell population in the kidneys by the provision of the
cytokine IL-15. While the depletion of NK cells impaired host defense in wild-type mice,
IL-15 administration restored antifungal responses in dectin-1-deficient mice. Our results uncover a new effector mechanism for
dectin-1 in anti-Aspergillus defense, adding an alternative approach to understand the pathophysiology of this
infection.