Evaluation of a specific diagnostic marker for rheumatoid arthritis based on cyclic citrullinated peptide

Min Park, Jae Chul Pyun, Hafeza Akter, Binh Thanh Nguyen, Min Jung Kang

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


A specific peptide marker for diagnosing rheumatoid arthritis (RA) was found based on cyclic citrullinated peptide (CCP) using the following three steps: (1) analysis of the binding epitope of autoimmune antibodies using ε-aminocaproic acid-modified peptides; (2) RA diagnosis using sequence-modified peptides; and (3) evaluation of the peptides' diagnostic performance for RA diagnosis. Ninety-five serum samples were analyzed by ELISA and compared using MedCalc (version 15.2.1). Microplate binding ε-aminocaproic acid was added to the N- or C-terminal of the CCP sequence. The N-terminal anchoring peptide assay showed 15% higher specificity compared with the C-terminal anchoring peptide assay. Based on this result, the hydrophilic C-terminal sequence of CCP was substituted with a hydrophobic amino acid. Among the sequence-modified peptides, CCP11A (in which alanine was substituted for the 11th amino acid of CCP) assay showed the highest sensitivity (87%) and specificity (100%) for RA diagnosis. Thus, CCP11A was selected as a possible specific marker peptide for RA diagnosis and further analyzed. The results of this analysis indicated that CCP11A showed better specificity than the CCP assay in both healthy individuals (11% better) and OA cohort (20% better). From these results, CCP11A was evaluated as a specific marker for diagnosing RA with higher diagnostic performance.

Original languageEnglish
Pages (from-to)107-113
Number of pages7
JournalJournal of Pharmaceutical and Biomedical Analysis
Publication statusPublished - 2015 Nov 1

Bibliographical note

Publisher Copyright:
© 2015 Z.

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Pharmaceutical Science
  • Drug Discovery
  • Spectroscopy
  • Clinical Biochemistry


Dive into the research topics of 'Evaluation of a specific diagnostic marker for rheumatoid arthritis based on cyclic citrullinated peptide'. Together they form a unique fingerprint.

Cite this