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FLIP and MAPK play crucial roles in the MLN51‐mediated hyperproliferation of fibroblast‐like synoviocytes in the pathogenesis of rheumatoid arthritis
Author(s) -
Ha JuEun,
Choi YoungEun,
Jang Jinah,
Yoon CheolHee,
Kim HoYoun,
Bae YongSoo
Publication year - 2008
Publication title -
the febs journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.981
H-Index - 204
eISSN - 1742-4658
pISSN - 1742-464X
DOI - 10.1111/j.1742-4658.2008.06500.x
Subject(s) - downregulation and upregulation , cancer research , fibroblast , pathogenesis , mapk/erk pathway , medicine , arthritis , protein kinase a , rheumatoid arthritis , immunology , p38 mitogen activated protein kinases , signal transduction , kinase , microbiology and biotechnology , chemistry , biology , cell culture , biochemistry , genetics , gene
One of the characteristic features of the pathogenesis of rheumatoid arthritis is synovial hyperplasia. We have reported previously that metastatic lymph node 51 (MLN51) and granulocyte–macrophage colony‐stimulating factor (GM‐CSF) are involved in the proliferation of fibroblast‐like synoviocytes in the pathogenesis of rheumatoid arthritis. In this study, we have found that: (1) GM‐CSF‐mediated MLN51 upregulation is attributable to both transcriptional and post‐translational control in rheumatoid arthritis fibroblast‐like synoviocytes; (2) p38 mitogen‐activated protein kinase plays a key role in the upregulation of MLN51; and (3) FLICE‐inhibitory protein is upregulated downstream of MLN51 in response to GM‐CSF, resulting in the proliferation of fibroblast‐like synoviocytes. These results imply that GM‐CSF signaling activates mitogen‐activated protein kinase, followed by the upregulation of MLN51 and FLICE‐inhibitory protein, resulting in fibroblast‐like synoviocyte hyperplasia in rheumatoid arthritis.