Enhanced formation of advanced oxidation protein products in IBD.
BACKGROUND
Advanced oxidation protein products (AOPPs) are new protein markers of oxidative stress with pro-inflammatory properties, accumulated in many pathological conditions. The issue of their enhanced formation in IBD has not been addressed yet.


METHODS
The concentration of relative AOPPs (rAOPP; concentration of AOPPs divided by albumin level) were measured in 68 subjects with ulcerative colitis (UC), 50 subjects with Crohn's disease (CD) and 45 healthy volunteers, and related to disease phenotype, clinical and biochemical activity, and therapeutic strategy. Diagnostic utility of rAOPP was evaluated by ROC analysis.


RESULTS
In comparison with controls (1.367 micromol/g), rAOPP were increased in inactive (1.778 micromol/g, P = 0.053) and active (1.895 micromol/g, P = 0.013) UC and in active (1.847 micromol/g, P = 0.003) CD. In CD, but not UC, rAOPP correlated with disease activity (r = 0.42, P = 0.013). Significant correlations with the inflammatory/malnutrition indices-erythrocyte sedimentation rate (ESR) (r = 0.53), leukocytes (r = 0.33), platelets (r = 0.38), IL-6 (r = 0.36), and transferrin (r = -0.35) were demonstrated in CD. In UC, rAOPP correlated only with ESR (r = 0.35) and IL-6 (r = 0.30). Instead, associations with antioxidant dismutase (r = 0.29) and catalase (r = 0.22) were observed. The diagnostic power of rAOPP in discriminating diseased from non-diseased subjects was less than that of C-reactive protein (CRP). Simultaneous determination of rAOPP and CRP did not significantly improve the power of single CRP determination.


CONCLUSIONS
IBD was associated with enhanced formation of AOPP, which differed between C and UC with respect to the relationship between rAOPP and disease activity, inflammatory and antioxidant response. These differences may reflect divergent ways that oxidative stress develops in CD and UC. The diagnostic power of rAOPP was insufficient for its clinical application.
Krzystek-Korpacka
Malgorzata
M
Department of Medical Biochemistry, Wroclaw Medical University, Wroclaw, Poland. krzystek@bioch.am.wroc.pl
Neubauer
Katarzyna
K
Berdowska
Izabela
I
Boehm
Dorota
D
Zielinski
Bogdan
B
Petryszyn
Pawel
P
Terlecki
Grzegorz
G
Paradowski
Leszek
L
Gamian
Andrzej
A
D000293:Adolescent; D000328:Adult; D000368:Aged; D015415:Biomarkers / Q000097:blood*; D001798:Blood Proteins / Q000378:metabolism*; D002097:C-Reactive Protein / Q000032:analysis; D003093:Colitis, Ulcerative / Q000097:blood; D003424:Crohn Disease / Q000097:blood; D005260:Female; D006801:Humans; D007249:Inflammation / Q000097:blood; D015212:Inflammatory Bowel Diseases / Q000097:blood* / Q000175:diagnosis; D015850:Interleukin-6 / Q000097:blood; D008055:Lipids / Q000097:blood; D008297:Male; D044342:Malnutrition / Q000097:blood; D008875:Middle Aged; D010084:Oxidation-Reduction; D018384:Oxidative Stress / Q000502:physiology*; D012372:ROC Curve; D014168:Transferrin / Q000032:analysis
D015415:Biomarkers; D001798:Blood Proteins; D015850:Interleukin-6; D008055:Lipids; D014168:Transferrin; D002097:C-Reactive Protein