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• W1938451804 endingPage "e1004929" @default.
• W1938451804 startingPage "e1004929" @default.
• W1938451804 abstract "The protozoan Leishmania mexicana parasite causes chronic non-healing cutaneous lesions in humans and mice with poor parasite control. The mechanisms preventing the development of a protective immune response against this parasite are unclear. Here we provide data demonstrating that parasite sequestration by neutrophils is responsible for disease progression in mice. Within hours of infection L. mexicana induced the local recruitment of neutrophils, which ingested parasites and formed extracellular traps without markedly impairing parasite survival. We further showed that the L. mexicana-induced recruitment of neutrophils impaired the early recruitment of dendritic cells at the site of infection as observed by intravital 2-photon microscopy and flow cytometry analysis. Indeed, infection of neutropenic Genista mice and of mice depleted of neutrophils at the onset of infection demonstrated a prominent role for neutrophils in this process. Furthermore, an increase in monocyte-derived dendritic cells was also observed in draining lymph nodes of neutropenic mice, correlating with subsequent increased frequency of IFNγ-secreting T helper cells, and better parasite control leading ultimately to complete healing of the lesion. Altogether, these findings show that L. mexicana exploits neutrophils to block the induction of a protective immune response and impairs the control of lesion development. Our data thus demonstrate an unanticipated negative role for these innate immune cells in host defense, suggesting that in certain forms of cutaneous leishmaniasis, regulating neutrophil recruitment could be a strategy to promote lesion healing." @default.
• W1938451804 created "2016-06-24" @default.
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• W1938451804 date "2015-05-28" @default.
• W1938451804 modified "2023-10-18" @default.
• W1938451804 title "Rapid Sequestration of Leishmania mexicana by Neutrophils Contributes to the Development of Chronic Lesion" @default.
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• W1938451804 doi "https://doi.org/10.1371/journal.ppat.1004929" @default.
• W1938451804 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4447405" @default.
• W1938451804 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/26020515" @default.
• W1938451804 hasPublicationYear "2015" @default.
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