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Contributions of different intraarticular tissues to the acute phase elevation of synovial fluid MMP‐2 following rat ACL rupture
Author(s) -
Tang Zhenyu,
Yang Li,
Wang Yequan,
Xue Ruyue,
Zhang Jin,
Huang Wei,
Chen Peter C.,
Sung K.L. Paul
Publication year - 2009
Publication title -
journal of orthopaedic research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.041
H-Index - 155
eISSN - 1554-527X
pISSN - 0736-0266
DOI - 10.1002/jor.20763
Subject(s) - anterior cruciate ligament , synovial fluid , matrix metalloproteinase , acl injury , medicine , inflammation , pathology , osteoarthritis , surgery , alternative medicine
Inflammation and accumulation of matrix metalloproteinases (MMPs) in synovial fluids may be involved in the poor healing ability of the anterior cruciate ligament (ACL) after injury. With a rat ACL rotating injury model, we found that levels of IL‐1β, IL‐6, and TNF‐α were significantly higher in synovial fluids after ACL injury. MMP‐2 activity and global MMP activity in synovial fluids also increased significantly in a time‐dependent manner. Ex vivo studies showed that all tissues contributed to the elevation of MMP‐2 in synovial fluids, especially synovium and the injured ACL. We concluded that although the regular wound‐healing mechanism also occurs after ACL injury, accumulation of MMP activity in the synovial fluids, due to all of the intraarticular tissues, may be at least one of the important reasons why an injured ACL cannot be repaired. © 2008 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 27:243–248, 2009