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• W3207126979 abstract "Abstract Invasive aspergillosis is a common opportunistic infection, causing >50% mortality in infected immunocompromised patients. The specific molecular mechanisms of the innate immune system that prevent pathogenesis of invasive aspergillosis in immunocompetent individuals are not fully understood. Here, we used a zebrafish larva- Aspergillus infection model to identify cyclooxygenase (COX) enzyme signaling as one mechanism that promotes host survival. Larvae exposed to the pan-COX inhibitor indomethacin succumb to infection at a significantly higher rate than control larvae. COX signaling is both macrophage- and neutrophil-mediated. However, indomethacin treatment has no effect on phagocyte recruitment. Instead, COX signaling promotes phagocyte-mediated inhibition of germination and invasive hyphal growth. Protective COX-mediated signaling requires the receptor EP2 and exogenous prostaglandin E 2 (PGE 2 ) rescues indomethacin-induced decreased immune control of fungal growth. Collectively, we find that COX signaling activates the PGE 2 -EP2 pathway to increase control A. fumigatus hyphal growth by phagocytes in zebrafish larvae. Author Summary Invasive aspergillosis causes mortality in >50% of infected patients. It is caused by a free-living fungus Aspergillus fumigatus which releases thousands of airborne spores. While healthy individuals clear inhaled spores efficiently, in immunocompromised individuals these spores grow into filamentous hyphae and destroy lungs and other tissues causing invasive aspergillosis. The immune mechanisms that control this fungal growth in healthy people are still largely unknown. Here, we used a larval zebrafish model of A. fumigatus infection to determine that cyclooxygenase enzymes, which are the target of non-steroidal anti-inflammatory drugs such as aspirin and ibuprofen, are important to control the fungus. Innate immune cells use cyclooxygenase signaling to prevent hyphal growth and tissue destruction. Our study provides new insights into the mechanisms that immune cells deploy to stop invasive growth of A. fumigatus and inform development of future strategies to combat invasive aspergillosis." @default.
• W3207126979 created "2021-10-25" @default.
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• W3207126979 date "2021-10-19" @default.
• W3207126979 modified "2023-10-16" @default.
• W3207126979 title "Cyclooxygenase production of PGE2 promotes phagocyte control of A. fumigatus hyphal growth in larval zebrafish" @default.
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• W3207126979 doi "https://doi.org/10.1101/2021.10.19.464929" @default.
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