Joint damage and inflammation in c-Jun N-terminal kinase 2 knockout mice with passive murine collagen-induced arthritis

Arthritis and Rheumatism
Zuoning HanG S Firestein

Abstract

Previous studies have demonstrated that inhibition of c-Jun N-terminal kinase (JNK) decreases joint destruction in the rat adjuvant arthritis model. The present study was undertaken to investigate whether selective loss of JNK-2 function decreases joint destruction in JNK-2 knockout mice, in order to determine the role of this isoform in inflammatory arthritis. Passive collagen-induced arthritis (CIA) was induced in Jnk2(-/-) and wild-type mice by administering anti-type II collagen antibodies. Arthritis was assessed daily using a semiquantitative clinical scoring system. Fibroblast-like synoviocytes (FLS) were prepared from Jnk2(-/-) and wild-type mice, and JNK protein expression was determined by Western blot analysis. Matrix metalloproteinase 13 (MMP-13) expression was determined by Northern blot analysis, and activator protein 1 (AP-1) binding activity by electromobility shift assay (EMSA). The JNK protein level in Jnk2(-/-) mice with CIA was 22% of that in wild-type mice with CIA (P < 0.001), and mainly the 46-kd isoform was expressed in the former group. Surprisingly, clinical arthritis was slightly more severe in the Jnk2(-/-) mice. Histologic scores for synovial inflammation were not significantly different. However, Sa...Continue Reading

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