Produção Nacional
Revisado por pares
CXCR4 and MIF are required for neutrophil extracellular trap release triggered by Plasmodium-infected erythrocytes
2020; Public Library of Science; Volume: 16; Issue: 8 Linguagem: Inglês
10.1371/journal.ppat.1008230
ISSN1553-7374
AutoresDanielle A. S. Rodrigues, Elisa Beatriz Prestes, Andreza Moreira Gama, Leandro S. Silva, Ana Acácia S. Pinheiro, José M. C. Ribeiro, Raquel Maria Pereira Campos, Pedro M. Pimentel‐Coelho, Heitor Siffert Pereira de Souza, Alassane Dicko, Patrick E. Duffy, Michal Fried, Ivo M.B. Francischetti, Elvira M. Saraiva, Heitor A. Paula-Neto, Marcelo T. Bozza,
Tópico(s)Immune cells in cancer
ResumoNeutrophil extracellular traps (NETs) evolved as a unique effector mechanism contributing to resistance against infection that can also promote tissue damage in inflammatory conditions. Malaria infection can trigger NET release, but the mechanisms and consequences of NET formation in this context remain poorly characterized. Here we show that patients suffering from severe malaria had increased amounts of circulating DNA and increased neutrophil elastase (NE) levels in plasma. We used cultured erythrocytes and isolated human neutrophils to show that Plasmodium-infected red blood cells release macrophage migration inhibitory factor (MIF), which in turn caused NET formation by neutrophils in a mechanism dependent on the C-X-C chemokine receptor type 4 (CXCR4). NET production was dependent on histone citrullination by peptidyl arginine deiminase-4 (PAD4) and independent of reactive oxygen species (ROS), myeloperoxidase (MPO) or NE. In vitro, NETs functioned to restrain parasite dissemination in a mechanism dependent on MPO and NE activities. Finally, C57/B6 mice infected with P. berghei ANKA, a well-established model of cerebral malaria, presented high amounts of circulating DNA, while treatment with DNAse increased parasitemia and accelerated mortality, indicating a role for NETs in resistance against Plasmodium infection.
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