title: Reduced soluble receptor for advanced glycation end-products in COPD.
abstract: The soluble receptor for advanced glycation end-products (sRAGE) has anti-inflammatory properties, and deficiency of circulating sRAGE is associated with various human diseases. Whether sRAGE concentrations are reduced in chronic obstructive pulmonary disease (COPD) has not been determined. The aim of this study was to determine plasma levels of sRAGE in COPD patients and establish whether sRAGE varies in relation to forced expiratory volume in 1 s (FEV(1)) and other inflammatory markers. 61 COPD patients and 42 healthy controls were recruited. Plasma sRAGE, C-reactive protein (CRP) and serum amyloid A (SAA) were measured in patients with stable COPD. A subgroup had measurements during acute exacerbations of COPD (AECOPD). sRAGE was significantly lower in stable COPD than in healthy controls (p<0.001), while CRP (p<0.001) and SAA (p = 0.015) were higher in stable COPD than in healthy controls. Multiple linear regression confirmed that COPD was negatively associated with sRAGE (p<0.001). Plasma sRAGE was positively correlated with FEV(1) (r(2) = 0.530, p<0.001), while CRP and SAA were inversely proportional to FEV(1). Multiple linear regression analysis showed that only sRAGE was a strong predictor of FEV(1). AECOPD were associated with even lower sRAGE levels that increased with convalescence. Circulating sRAGE is lower in COPD and shows a strong correlation to the degree of airflow limitation.
authors.affiliation: Dept of Respiratory Medicine, Princess Alexandra Hospital, The University of Queensland, Ipswich Road, Woolloongabba, Brisbane, Qld 4102, Australia.
authors.forename: D J
authors.initials: DJ
authors.lastname: Smith
authors.forename: S T
authors.initials: ST
authors.lastname: Yerkovich
authors.forename: M A
authors.initials: MA
authors.lastname: Towers
authors.forename: M L
authors.initials: ML
authors.lastname: Carroll
authors.forename: R
authors.initials: R
authors.lastname: Thomas
authors.forename: J W
authors.initials: JW
authors.lastname: Upham
mesh_terms: D000368:Aged; D015415:Biomarkers / Q000378:metabolism; D016022:Case-Control Studies; D005260:Female; D005541:Forced Expiratory Volume; D005786:Gene Expression Regulation; D017127:Glycation End Products, Advanced / Q000378:metabolism*; D006801:Humans; D007249:Inflammation; D008297:Male; D008875:Middle Aged; D029424:Pulmonary Disease, Chronic Obstructive / Q000378:metabolism*; D000067759:Receptor for Advanced Glycation End Products / Q000378:metabolism*; D012129:Respiratory Function Tests; D011795:Surveys and Questionnaires
chemical_list: D015415:Biomarkers; D017127:Glycation End Products, Advanced; D000067759:Receptor for Advanced Glycation End Products