Enzyme-linked immunosorbent assay (ELISAs) for metalloproteinase derived type II collagen neoepitope, CIIM--increased serum CIIM in subjects with severe radiographic osteoarthritis

Anne-Christine Bay-Jensen, Qi Liu, Inger Byrjalsen, Yi Li, Jianxia Wang, Christian Pedersen, Diana J Leeming, Erik B Dam, Qinlong Zheng, Per Qvist, Morten A Karsdal

100 Citationer (Scopus)

Abstract

Objectives: In joint degenerative diseases, the collagens are degraded by matrix metalloproteinases and protein fragments are released to serum as potential biomarkers. Methods: A collagen type II specific neoepitope, CIIM, was identified (RDGAAG1053) by mass spectrometry. Two ELISAs against the neoepitope were developed. CIIM was measured in cartilage explants in the presence or absence of protease inhibitors. CIIM was measured in OA synovial fluid (n=51) and serum (n=156). Knee OA was graded by standard Kellgren-Lawrence (KL) score. Results: The ELISAs showed good technical performance; CV%, < 13%. CIIM release from cartilage explants was blocked by the MMP inhibitor. CIIM was detected in synovial fluid. Furthermore, serum CIIM levels were significantly higher (P< 0.05) in those individuals with mild or severe OA than in those with no OA. Conclusion: We developed a new biomarker for joint degenerative diseases, which we demonstrated was derived from MMP-degraded type II collagen.

OriginalsprogEngelsk
TidsskriftClinical Biochemistry
Vol/bind44
Udgave nummer5-6
Sider (fra-til)423-9
Antal sider7
ISSN0009-9120
DOI
StatusUdgivet - apr. 2011

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