title: Peptide mimic isolated by autoantibody reveals human arrest defective 1 overexpression is associated with poor prognosis for colon cancer patients.
abstract: Tumor-associated antigens, which induce the generation of autoantibodies, are useful as cancer biomarkers in early detection and prognostic prediction of cancer. To isolate a novel cancer marker, we used serum antibodies from colon cancer patients to screen a phage display peptide library. A positive peptide 249C (VPLYSNTLRYGF) that could specifically react with serum from colon cancer patients was isolated, and the corresponding antigen-human arrest defective 1 (ARD1A), which shares an identical LYSNTL motif with 249C, was identified. Both immunological assays and three-dimensional structure analysis showed that the LYSNTL region is an epitope of ARD1A. Using ELISA and immunohistochemistry, we found anti-ARD1A antibody levels in serum from patients with colon cancer were significantly higher than those in healthy volunteers (P < 0.001), and ARD1A expression was detected in 84.1% (227/270) of colon cancer tissues compared with 22.7% (55/242) of matched noncancerous tissues (P < 0.001) and 4.8% (2/42) of benign lesions (P < 0.001). Furthermore, multivariate analysis with Cox proportional hazards regression models revealed that ARD1A-positive patients had significantly shortened overall survival (OS) (HR, 1.91, P = 0.039) and borderline significantly shortened disease-free survival (DFS) (HR, 1.70; P = 0.068). Kaplan-Meier survival curves also showed that ARD1A expression was associated significantly with shortened DFS (P = 0.037) and OS (P = 0.019). These results indicate that ARD1A is a novel tumor-associated antigen and a potential prognostic factor for colon cancer.
authors.affiliation: Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Department of Biochemistry and Molecular Biology, Peking University School of Oncology, Beijing, China.
authors.forename: Beihai
authors.initials: B
authors.lastname: Jiang
authors.forename: Tingting
authors.initials: T
authors.lastname: Ren
authors.forename: Bin
authors.initials: B
authors.lastname: Dong
authors.forename: Like
authors.initials: L
authors.lastname: Qu
authors.forename: Genglin
authors.initials: G
authors.lastname: Jin
authors.forename: Jianning
authors.initials: J
authors.lastname: Li
authors.forename: Hong
authors.initials: H
authors.lastname: Qu
authors.forename: Lin
authors.initials: L
authors.lastname: Meng
authors.forename: Caiyun
authors.initials: C
authors.lastname: Liu
authors.forename: Jian
authors.initials: J
authors.lastname: Wu
authors.forename: Chengchao
authors.initials: C
authors.lastname: Shou
mesh_terms: D000123:Acetyltransferases / Q000097:blood* / Q000302:isolation & purification; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000951:Antigens, Neoplasm / Q000097:blood* / Q000302:isolation & purification; D001323:Autoantibodies / Q000097:blood*; D014408:Biomarkers, Tumor / Q000097:blood / Q000302:isolation & purification; D015153:Blotting, Western; D045744:Cell Line, Tumor; D003110:Colonic Neoplasms / Q000097:blood* / Q000401:mortality*; D018572:Disease-Free Survival; D004797:Enzyme-Linked Immunosorbent Assay; D000939:Epitopes / Q000302:isolation & purification; D006801:Humans; D053208:Kaplan-Meier Estimate; D008875:Middle Aged; D063209:N-Terminal Acetyltransferase A; D063213:N-Terminal Acetyltransferase E; D011379:Prognosis; D016016:Proportional Hazards Models
chemical_list: D000951:Antigens, Neoplasm; D001323:Autoantibodies; D014408:Biomarkers, Tumor; D000939:Epitopes; D000123:Acetyltransferases; D063209:N-Terminal Acetyltransferase A; C504824:NAA10 protein, human; D063213:N-Terminal Acetyltransferase E