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Aggrecanases in the human synovial fluid at different stages of osteoarthritis

Abstract

In vivo and in vitro aggrecanases degrade proteoglycan aggrecan in articular cartilage. However, the expression of aggrecanases in patients in different stages of osteoarthritis (OA) has not been investigated. This study detected the expression of a disintegrin and metalloproteinase with thrombospondin motifs 4 (ADAMTS-4) and ADAMTS-5 and their proteolytic products, ARGxx, in the synovial fluid (SF) of patients in different stages of OA. This study aimed to evaluate the expression of aggrecanases and to explore the respective roles of these enzymes in human cartilage degradation. A total of 144 patients with knee OA were divided into early-, middle-, and late-stage OA groups according to the degree of cartilage degradation using Recht’s MRI grading standard and the modified Outerbridge classification system. Expression levels of ADAMTS-4, ADAMTS-5, and ARGxx in the SF from these patients were measured using enzyme-linked immunosorbent assay (ELISA) and Western blot analysis. Our findings showed that ADAMTS-4 and ARGxx expression levels in the early-stage group were significantly higher than in the other two groups. ADAMTS-5 in the early-stage group and ADAMTS-4, ADAMTS-5, and ARGxx in the late-stage group were significantly higher than those in the middle-stage OA group. Both ADAMTS-4 and ADAMTS-5 levels were correlated with ARGxx levels (P < 0.05). The correlation coefficients of ADAMTS-4 and ADAMTS-5 were 0.236 and 0.068, 0.729 and 0.479, and 0.675 and 0.257 in the early-, middle-, and late-stage groups, respectively, and 0.530 and 0.258 in the total SF samples. Western blot analysis revealed that the ADAMTS-4 and ADAMTS-5 in SF were 50 kDa proteins and that ARGxx in SF had at least two molecular masses, 55 kDa and 70 kDa. The expression levels of all three proteins were consistent with the ELISA results. These results suggested that aggrecanases were involved in all stages of human OA aggrecan degradation, especially in the early and late stages. ADAMTS-4 levels were higher in early- compared with middle- or late-stage OA and were also more correlated with ARGxx than ADAMTS-5; thus, ADAMTS-4 might be the principal aggrecanase of aggrecan degradation in human OA.

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Abbreviations

ADAMTS:

A disintegrin and metalloproteinase with thrombospondin motifs

ELISA:

Enzyme-linked immunosorbent assay

MMP:

Matrix metalloproteinase

OA:

Osteoarthritis

SF:

Synovial fluid

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Acknowledgments

This work was supported by the Provincial Natural Science Foundation of Shandong (Y2007C132), National Natural Science Foundation of China (NTFC) (30972720), National Basic Research Program of China (2010CB529105), and Shandong Taishan Scholarship.

Disclosures

None.

Author information

Correspondence to Xinfeng Yan.

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Zhang, E., Yan, X., Zhang, M. et al. Aggrecanases in the human synovial fluid at different stages of osteoarthritis. Clin Rheumatol 32, 797–803 (2013). https://doi.org/10.1007/s10067-013-2171-0

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Keywords

  • A disintegrin and metalloproteinase with thrombospondin motifs
  • Aggrecanase
  • Cartilage destruction
  • Matrix metalloproteinase
  • Osteoarthritis
  • Synovial fluid