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Natural killer cells play an essential role in resolution of antigen-induced inflammation in mice.

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Authors
Anuforo, Osk U U
Bjarnarson, Stefania P
Jonasdottir, Hulda S
Giera, Martin
Hardardottir, Ingibjorg
Freysdottir, Jona
Issue Date
2018-01

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Natural killer cells play an essential role in resolution of antigen-induced inflammation in mice. 2018, 93:1-8 Mol. Immunol.
Abstract
This study examined whether NK cells are important for resolution of antigen-induced inflammation. C57BL/6 mice were immunized twice with methylated BSA (mBSA) and inflammation induced by intraperitoneal injection of mBSA. Mice were injected intravenously with anti-asialo GM1 (αASGM1) or a control antibody 24h prior to peritonitis induction and peritoneal exudate collected at different time points. Expression of surface molecules and apoptosis on peritoneal cells was determined by flow cytometry and concentration of chemokines, cytokines, soluble cytokine receptors and lipid mediators by ELISA and LC-MS/MS. Apoptosis in parathymic lymph nodes and spleens was determined by TUNEL staining. Mice administered αASGM1 had lower peritoneal NK cell numbers and a higher number of peritoneal neutrophils 12h after induction of inflammation than control mice. The number of neutrophils was still high in the αASGM1 treated mice when their number had returned to baseline levels in the control mice, 48h after induction of inflammation. Peritoneal concentrations of the neutrophil regulators G-CSF and IL-12p40 were higher at 12h in the αASGM1 treated mice than in the control mice, whereas concentrations of lipid mediators implicated in resolution of inflammation, i.e. LXA4and PGE2, were lower. Reduced apoptosis was detected in peritoneal neutrophils as well as in draining lymph nodes and spleens from the αASGM1 treated mice compared with that in the control mice. In addition, αASGM1 treated mice had lower number of peritoneal NK cells expressing NKp46 and NKG2D, receptors implicated in NK cell-induced neutrophil apoptosis. Furthermore, αASGM1 treatment completely blocked the increase in CD27+NK cells that occurred in control mice following induction of inflammation, but CD27+NK cells have been suggested to have a regulatory role. These results indicate a crucial role for NK cells in resolution of antigen-induced inflammation and suggest their importance in tempering neutrophil recruitment and maintaining neutrophil apoptosis.
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https://reader.elsevier.com/reader/sd/E64C7F2BAF2E61E2F96B19D2E97FF67E8CD276D068921683BBA4C5157DE21302A20725CF6F3DAFA1826A6FF4C18594FB
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Archived with thanks to Molecular immunology
ae974a485f413a2113503eed53cd6c53
10.1016/j.molimm.2017.10.019
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English Journal Articles (Peer Reviewed)

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