title: Expression and Clinical Significance of Serum Dipeptidyl Peptidase IV Chronic Obstructive Pulmonary Disease.
abstract: OBJECTIVE
  The purpose of this study is to explore the correlation between serum dipeptidyl peptidase IV (DPPIV) and chronic obstructive pulmonary disease (COPD) at its various disease states, analyze its applications in the prediction and diagnosis of COPD and test the possibility of DPPIV as the serologic marker for COPD screening.
  
  
  METHODS
  Samples from 74 patients (42 cases with acute exacerbation of COPD or acute exacerbation COPD (AECOPD) and 32 cases with stable COPD) and 29 control subjects were collected in this study. Those patients with AECOPD were classified as COPD remission group if their clinical symptoms relieved after nonintravenous or oral hormone therapy for 7 ± 3 days. DPPIV concentration was measured by enzyme-linked immunosorbent assay, and the difference in serum concentration of DPPIV was compared among different groups. The correlation between DPPIV concentration and age, sex or smoking history was analyzed, and the diagnostic value of DPPIV was evaluated by receiver-operating characteristic (ROC) curve analysis.
  
  
  RESULTS
  Serum DPPIV concentration was significantly lower in all COPD groups as compared with that in healthy control group (P < 0.001). Serum DPPIV concentration in AECOPD group was increased after treatment (P < 0.001). There was no significant correlation between DPPIV concentration and age, sex or smoking history (P > 0.05). ROC analysis indicated that serum DPPIV concentration in all groups showed a good diagnostic accuracy, especially in stable COPD and AECOPD groups. The area under the ROC curve values were 0.901 and 0.906, respectively, with a high specificity of 0.931 for both groups and a high sensitivity of 0.75 for stable COPD and 0.875 for AECOPD.
  
  
  CONCLUSIONS
  Serum DPPIV concentration in patients with COPD is decreased significantly, and there is no correlation between serum DPPIV concentration and sex or age. Serum DPPIV not only is an independent predictive factor, but also of high value as a good serologic marker for the diagnosis of COPD.
authors.affiliation: Department of Respiratory Medicine (X-YC, YY, X-QJ, YW, L-NP, X-HA, C-YJ, J-HG), Baotou Central Hospital, Donghe District, Baotou, China.
authors.forename: Xiao-Yue
authors.initials: XY
authors.lastname: Chang
authors.affiliation: Department of Respiratory Medicine (X-YC, YY, X-QJ, YW, L-NP, X-HA, C-YJ, J-HG), Baotou Central Hospital, Donghe District, Baotou, China. Electronic address: snicl@qq.com.
authors.forename: Yong
authors.initials: Y
authors.lastname: Yang
authors.affiliation: Department of Respiratory Medicine (X-YC, YY, X-QJ, YW, L-NP, X-HA, C-YJ, J-HG), Baotou Central Hospital, Donghe District, Baotou, China.
authors.forename: Xiao-Qing
authors.initials: XQ
authors.lastname: Jia
authors.affiliation: Department of Respiratory Medicine (X-YC, YY, X-QJ, YW, L-NP, X-HA, C-YJ, J-HG), Baotou Central Hospital, Donghe District, Baotou, China.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Department of Respiratory Medicine (X-YC, YY, X-QJ, YW, L-NP, X-HA, C-YJ, J-HG), Baotou Central Hospital, Donghe District, Baotou, China.
authors.forename: Li-Na
authors.initials: LN
authors.lastname: Peng
authors.affiliation: Department of Respiratory Medicine (X-YC, YY, X-QJ, YW, L-NP, X-HA, C-YJ, J-HG), Baotou Central Hospital, Donghe District, Baotou, China.
authors.forename: Xiao-Hong
authors.initials: XH
authors.lastname: Ai
authors.affiliation: Department of Respiratory Medicine (X-YC, YY, X-QJ, YW, L-NP, X-HA, C-YJ, J-HG), Baotou Central Hospital, Donghe District, Baotou, China.
authors.forename: Cui-Ying
authors.initials: CY
authors.lastname: Jiang
authors.affiliation: Department of Respiratory Medicine (X-YC, YY, X-QJ, YW, L-NP, X-HA, C-YJ, J-HG), Baotou Central Hospital, Donghe District, Baotou, China.
authors.forename: Jian-Hua
authors.initials: JH
authors.lastname: Guo
authors.affiliation: Department of Nephrology Medicine (T-TW), Baotou Central Hospital, Donghe District, Baotou, China.
authors.forename: Ting-Ting
authors.initials: TT
authors.lastname: Wu
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D015415:Biomarkers / Q000097:blood; D016022:Case-Control Studies; D018819:Dipeptidyl Peptidase 4 / Q000097:blood* / Q000235:genetics; D005260:Female; D015971:Gene Expression Regulation, Enzymologic; D006801:Humans; D008297:Male; D008875:Middle Aged; D029424:Pulmonary Disease, Chronic Obstructive / Q000097:blood* / Q000175:diagnosis* / Q000453:epidemiology; D012907:Smoking / Q000097:blood / Q000453:epidemiology
chemical_list: D015415:Biomarkers; D018819:Dipeptidyl Peptidase 4
keywords: Chronic obstructive pulmonary disease; Dipeptidyl peptidase IV; Inflammation; Lymphocytes