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has been cited by the following article:

• TITLE: Matrix Metalloproteinase MMP-9 Promotes K/BxN Serum Induced Arthritis in Mice

  AUTHORS: Narendiran Rajasekaran, Harald Illges

  KEYWORDS: MMP-9; Antibody Induced Arthritis; K/BxN; Gelatin Zymography

  JOURNAL NAME: Open Journal of Rheumatology and Autoimmune Diseases, Vol.4 No.1, January 23, 2014

  ABSTRACT: Matrix metalloproteinases (MMPs) are matrix-degrading enzymes that are over-expressed in joints of rheumatoid arthritis (RA) patients. However, the contribution of specific MMPs for the development of arthritic joints is unknown. This study is aimed at studying the role of matrix metalloproteinase-9 (MMP-9) in mice, using the K/BxN serum-transfer model of RA. Arthritis was induced in Balb/c mice by injecting K/BxN serum. Development of arthritis was followed in these mice by measuring ankle thickness and clinical index score. MMP-9 expression in the joints of mice killed at various time points during the disease progression was determined by gelatin zymography using ankle lysates. We found that MMP-9 expression increased with the severity of arthritis. Importantly MMP-9 deficient mice injected with K/BxN serum showed a milder form of arthritis in comparison to the control C57BL/6 mice injected with K/BxN serum. We therefore conclude that MMP-9 promotes arthritis in mice.