Leptospira species promote a pro‐inflammatory phenotype in human neutrophils. (21st December 2018)

• Record Type: Journal Article
• Authors: Charo, Nancy; Scharrig, Emilia; Ferrer, María F.; Sanjuan, Norberto; Carrera Silva, Eugenio A.; Schattner, Mirta; Gómez, Ricardo M.
• Other Names: Caimano Melissa guestEditor.
• Is Part Of: Cellular microbiology. Volume 21:Number 2(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-12-21
• Subjects: degranulation -- granulocytes -- Leptospira biflexa -- Leptospira interrogans -- phagocytosis -- polymorphonuclear cells; Microbiology -- Periodicals; Cytology -- Periodicals; Host-parasite relationships -- Periodicals; Microbiology -- Periodicals; Cells -- Periodicals; Microbiologie -- Périodiques; Microbiologie; Relation hôte-parasite; Cytologie; Cellule; Réponse cellulaire; Ressource Internet (Descripteur de forme); Périodique électronique (Descripteur de forme); 579.05
• DOI: 10.1111/cmi.12990
• Languages: English
• ISSNs: 1462-5814

Abstract

Abstract: Leptospirosis is a global zoonosis caused by pathogenic Leptospira . Neutrophils are key cells against bacterial pathogens but can also contribute to tissue damage. Because the information regarding the role of human neutrophils in leptospirosis is scant, we comparatively analysed the human neutrophil's response to saprophytic Leptospira biflexa serovar Patoc (Patoc) and the pathogenic Leptospira interrogans serovar Copenhageni (LIC). Both species triggered neutrophil responses involved in migration, including the upregulation of CD11b expression, adhesion to collagen, and the release of IL‐8. In addition, both species increased levels of pro‐inflammatory IL‐1β and IL‐6 associated with the inflammasome and NFκB pathway activation and delayed neutrophil apoptosis. LIC was observed on the neutrophil surface and not phagocytized. In contrast, Patoc generated intracellular ROS associated with its uptake. Neutrophils express the TYRO3, AXL, and MER receptor protein tyrosine kinases (TAM), but only LIC selectively increased the level of AXL. TLR2 but not TLR4‐blocking antibodies abrogated the IL‐8 secretion triggered by both Leptospira species. In summary, we demonstrate that Leptospira species trigger a robust neutrophil activation and pro‐inflammatory response. These findings may be useful to find new diagnostic markers and therapeutic strategies against leptospirosis.