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Screening serum biomarker of knee osteoarthritis using a phage display technique
Xiaojun Weng1, Qiande Liao, Kanghua Li
1Department of Orthopaedics, Xiangya Hospital, Central South University, 87 Xiangya Road, Changsha, Hunan, PR China.
Objectives:
To screen serum biomarker of knee osteoarthritis (OA) using a phage random peptide library.
Design And Methods:
A phage random peptide library of random peptide 12-mers was screened with purified immunoglobulin G (IgG) from sera of knee OA patients. Patients with knee rheumatoid arthritis (RA), hip OA, non-erosive hand OA or erosive hand OA, and healthy volunteers were used as controls.
Results:
A phage clone with inserted peptide TGLESGHGPGDS (named KOA1) showed 90% positive reaction rate with the knee OA patients, significantly higher than that with the knee RA patients (27.8%), the non-erosive hand OA patients (34.3%), the erosive hand OA patients (31.3%) and the healthy controls (12.0%), but not the hip OA patients (82.5%).
Conclusions:
The novel knee OA mimic peptide KOA1 identified with a random phage display peptide library and sera from knee OA patients could be a potential serum biomarker for knee OA.
