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https://hdl.handle.net/2440/51898
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Type: | Journal article |
Title: | Azithromycin improves macrophage phagocytic function and expression of mannose receptor in chronic obstructive pulmonary disease |
Author: | Hodge, S. Hodge, G. Jersmann, H. Matthews, G. Ahern, J. Holmes, M. Reynolds, P. |
Citation: | American Journal of Respiratory and Critical Care Medicine, 2008; 178(2):139-148 |
Publisher: | American Thoracic Society |
Issue Date: | 2008 |
ISSN: | 1073-449X 1535-4970 |
Statement of Responsibility: | Sandra Hodge, Greg Hodge, Hubertus Jersmann, Geoffrey Matthews, Jessica Ahern, Mark Holmes and Paul N. Reynolds |
Abstract: | Rationale: Defective efferocytosis (phagocytic clearance of apoptotic cells) in the airway may perpetuate inflammation via secondary necrosis in chronic obstructive pulmonary disease (COPD). We have previously reported that low-dose azithromycin improved alveolar macrophage (AM) phagocytic function in vitro. Objectives: We investigated collectins (mannose-binding lectin [MBL] and surfactant protein [SP]-D) and mannose receptor (MR) in COPD and their possible role in the azithromycin-mediated improvement in phagocytosis. Methods: In vitro effects of azithromycin on AM expression of MR were investigated. MBL, SP-D, and MR were measured in patients with COPD and control subjects. Azithromycin (250 mg orally daily for 5 d then twice weekly for 12 wk) was administered to 11 patients with COPD. Assessments included AM phagocytic ability and expression of MR, MBL, SP-D, bronchial epithelial cell apoptosis, pulmonary function, C-reactive protein, blood/BAL leukocyte counts, cytokine production, and T-cell markers of activation and phenotype. Measurements and Main Results: Azithomycin (500 ng/ml) increased MR expression by 50% in vitro. AM MR expression and levels of MBL and SP-D were significantly reduced in patients with COPD compared with control subjects. In patients with COPD, after azithromycin therapy, we observed significantly improved AM phagocytic ability (pre: 9.9%; post: 15.1%), reduced bronchial epithelial cell apoptosis (pre: 30.0%; post: 19.7%), and increased MR and reduced inflammatory markers in the peripheral blood. These findings implicate the MR in the defective phagocytic function of AMs in COPD and as a target for the azithromycin-mediated improvement in phagocytic ability. Conclusions: Our findings indicate a novel approach to supplement existing therapies in COPD. |
Keywords: | chronic obstructive pulmonary disease alveolar macrophage phagocytosis azithromycin apoptosis |
Description: | Copyright © 2008 American Thoracic Society |
DOI: | 10.1164/rccm.200711-1666OC |
Published version: | http://dx.doi.org/10.1164/rccm.200711-1666oc |
Appears in Collections: | Aurora harvest Medicine publications |
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