title: Serum S100A12 (EN-RAGE) levels in patients with decreased renal function and subclinical chronic inflammatory disease.
abstract: BACKGROUND
  The calcium-binding protein S100A12 (EN-RAGE) causes inflammation through interaction with the multiligand receptor for advanced glycation end products (RAGE). The aim of the study was to determine S100A12 levels and describe their relationship to inflammatory markers in patients with decreased renal function.
  
  
  METHODS
  The studied group consisted of 46 patients with various degrees of chronic renal insufficiency (CHRI), 31 long-term hemodialysis (HD) patients and 24 healthy controls. S100A12 and soluble RAGE were assessed immunochemically (ELISA), and routine biochemical parameters were measured.
  
  
  RESULTS
  S100A12 levels were not different in CHRI (166 ± 140 ng/ml) and HD patients (127 ± 101 ng/ml) compared to controls (126 ± 106 ng/ml; p = 0.20, n.s.). In CHRI patients, S100A12 correlated with C-reactive protein (CRP) levels, orosomucoid, and inversely with α(2)-macroglobulin. In HD patients, S100A12 correlated with age, CRP, orosomucoid, fibrinogen and leukocyte levels. In multivariate regression analysis after adjustment for age, S100A12 levels remained correlated with: orosomucoid in CHRI patients; CRP, leukocytes, fibrinogen and negatively with sRAGE in HD patients; and leukocytes in controls.
  
  
  CONCLUSIONS
  Although S100A12 levels were not elevated in patients with decreased kidney function, a relation to markers of inflammation was found. Further studies are required to demonstrate the significance of S100A12 in patients with decreased renal function.
authors.affiliation: Department of Nephrology, First Faculty of Medicine, Charles University in Prague and General University Hospital in Prague, Czech Republic.
authors.forename: Oskar
authors.initials: O
authors.lastname: Zakiyanov
authors.forename: Marta
authors.initials: M
authors.lastname: Kalousová
authors.forename: Vítězslav
authors.initials: V
authors.lastname: Kříha
authors.forename: Tomáš
authors.initials: T
authors.lastname: Zima
authors.forename: Vladimír
authors.initials: V
authors.lastname: Tesař
mesh_terms: D000328:Adult; D000368:Aged; D015415:Biomarkers / Q000097:blood; D005260:Female; D006801:Humans; D018836:Inflammation Mediators / Q000097:blood*; D007668:Kidney / Q000378:metabolism / Q000503:physiopathology*; D007676:Kidney Failure, Chronic / Q000097:blood / Q000473:pathology / Q000503:physiopathology; D007677:Kidney Function Tests / Q000379:methods; D008297:Male; D008875:Middle Aged; D051436:Renal Insufficiency, Chronic / Q000097:blood* / Q000473:pathology / Q000503:physiopathology*; D009418:S100 Proteins / Q000097:blood*; D000067616:S100A12 Protein
chemical_list: D015415:Biomarkers; D018836:Inflammation Mediators; D009418:S100 Proteins; D000067616:S100A12 Protein; C090441:S100A12 protein, human