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Neutrophil-mediated antifungal activity against highly virulent Cryptococcus gattii strain R265.
Medical Mycology 2019 January 19
Vaccine-induced immune responses, including neutrophil, macrophage, and T-cell responses, ameliorate cryptococcosis caused by Cryptococcus gattii. However, whether neutrophils can exert fungicidal activity against C. gattii remains to be elucidated. Therefore, in this study, we investigated the neutrophil-mediated fungicidal effect against C. gattii R265 in vitro and compared it to the related fungal pathogen, Cryptococcus neoformans standard strain H99. We found that neutrophils recognized, phagocytosed, and killed C. gattii R265 in the presence of fresh mouse serum. This antifungal effect required phagocytosis and serine protease activity but not nicotinamide adenine dinucleotide phosphate oxidase activity. We also demonstrated that C. gattii R265 was more resistant to oxidative and nitrosative stress than C. neoformans H99. Together, these findings indicate that neutrophils can exert fungicidal activity against highly virulent C. gattii, at least under in vitro conditions.
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