The role of ChemR23 in the induction and resolution of cigarette smoke-induced inflammation

T Demoor, KR Bracke, LL Dupont… - The Journal of …, 2011 - journals.aai.org
T Demoor, KR Bracke, LL Dupont, M Plantinga, B Bondue, MO Roy, V Lannoy…
The Journal of immunology, 2011journals.aai.org
Chronic obstructive pulmonary disease is mainly triggered by cigarette smoke (CS) and
progresses even after smoking cessation. CS induces an exaggerated influx of inflammatory
cells to the bronchoalveolar space and lung parenchyma, likely resulting from a complex
interplay between chemoattractants and their respective receptors. In a murine CS model of
chronic obstructive pulmonary disease, we studied the importance of chemokine-like
receptor ChemR23 for the induction and resolution of inflammation in CS-exposed lungs …
Abstract
Chronic obstructive pulmonary disease is mainly triggered by cigarette smoke (CS) and progresses even after smoking cessation. CS induces an exaggerated influx of inflammatory cells to the bronchoalveolar space and lung parenchyma, likely resulting from a complex interplay between chemoattractants and their respective receptors. In a murine CS model of chronic obstructive pulmonary disease, we studied the importance of chemokine-like receptor ChemR23 for the induction and resolution of inflammation in CS-exposed lungs. Subacute and chronic CS exposure increased protein levels of the ChemR23 ligand and chemoattractant, chemerin, in bronchoalveolar lavage (BAL) fluid of wild-type (WT) mice. Moreover, the proinflammatory chemokines CXCL1, CCL2, and CCL20 were increased in the airways of CS-exposed WT mice, accompanied by a massive accumulation of inflammatory neutrophils and monocytes, CD11b hi CD103− and CD11b lo CD103+ dendritic cells (DCs), and CD4+ and CD8+ T cells. The lung parenchyma of WT mice was infiltrated with inflammatory neutrophils, CD11b hi CD103− DCs, and activated CD4+ T cells after CS exposure. CS-induced inflammation was severely attenuated in BAL fluid and lungs of ChemR23 knockout mice with regard to the induction of inflammatory chemokines and the recruitment of inflammatory cells. Neutrophils and CD8+ T cells persisted in the airways of WT mice, as did the airway-derived conventional DCs in the mediastinal lymph nodes, for at least 14 d after smoking cessation. In the BAL fluid of CS-exposed ChemR23 knockout mice, there was a remarkable delayed accumulation of T cells 14 d after the final exposure. Our data support a role for ChemR23 in directing innate and adaptive immune cells to CS-exposed lungs.
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