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• W2800567595 abstract "Rationale: Lung natural killer cells (NKs) kill a greater percentage of autologous lung parenchymal cells in chronic obstructive pulmonary disease (COPD) than in nonobstructed smokers. To become cytotoxic, NKs require priming, typically by dendritic cells (DCs), but whether priming occurs in the lungs in COPD is unknown.Methods: We used lung tissue and in some cases peripheral blood from patients undergoing clinically indicated resections to determine in vitro killing of CD326+ lung epithelial cells by isolated lung CD56+ NKs. We also measured the cytotoxicity of unprimed blood NKs after preincubation with lung DCs. To investigate mechanisms of DC-mediated priming, we used murine models of COPD induced by cigarette smoke (CS) exposure or by polymeric immunoglobulin receptor (pIgR) deficiency, and blocked IL-15Rα (IL-15 receptor α subunit) trans-presentation by genetic and antibody approaches.Results: Human lung NKs killed isolated autologous lung epithelial cells; cytotoxicity was increased (P = 0.0001) in COPD, relative to smokers without obstruction. Similarly, increased lung NK cytotoxicity compared with control subjects was observed in CS-exposed mice and pIgR−/− mice. Blood NKs both from smokers without obstruction and subjects with COPD showed minimal epithelial cell killing, but in COPD, preincubation with lung DCs increased cytotoxicity. NKs were primed by CS-exposed murine DCs in vitro and in vivo. Inhibiting IL-15Rα trans-presentation eliminated NK priming both by murine CS-exposed DCs and by lung DCs from subjects with COPD.Conclusions: Heightened NK cytotoxicity against lung epithelial cells in COPD results primarily from lung DC–mediated priming via IL-15 trans-presentation on IL-15Rα. Future studies are required to test whether increased NK cytotoxicity contributes to COPD pathogenesis." @default.
• W2800567595 created "2018-05-17" @default.
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• W2800567595 date "2018-11-01" @default.
• W2800567595 modified "2023-09-30" @default.
• W2800567595 title "Lung Dendritic Cells Drive Natural Killer Cytotoxicity in Chronic Obstructive Pulmonary Disease via IL-15Rα" @default.
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• W2800567595 doi "https://doi.org/10.1164/rccm.201712-2513oc" @default.
• W2800567595 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6221577" @default.
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