OBJECTIVE: The mitogen-activated protein (MAP) kinase JNK is a key regulator of interleukin-1 (IL-1)-induced collagenase gene expression and joint destruction in arthritis. Two upstream kinases, MKK-4 and MKK-7, have been identified as potential activators of JNK. However, the role of MAP kinase kinases (MAPKKs) and their functional organization within fibroblast-like synoviocytes (FLS) have not been defined. We therefore evaluated the interactions between the various MAP kinase components and determined their subcellular localization. METHODS: MKKs were identified by immunohistochemistry of rheumatoid arthritis (RA) and osteoarthritis (OA) synovium. Western blotting was used to determine the expression of FLS. Immunoprecipitation experiments using antibodies specific for MKK-4, MKK-7, and JNK were performed. Phosphospecific antibodies and immunohistochemistry were used to evaluate the activation state of synovial MKK-4 and MKK-7. Confocal microscopy was used to determine the subcellular location of the kinases. RESULTS: Immunohistochemistry studies demonstrated abundant MKK-4 and MKK-7 in RA and OA synovium, but the levels of phosphorylated kinases were significantly higher in RA synovium. MKK-4 and MKK-7 were constitutively expressed by cultured RA and OA FLS, and IL-1 stimulation resulted in rapid phosphorylation of both kinases. JNK was detected in MKK-4 and MKK-7 immunoprecipitates. Furthermore, MKK-4 coprecipitated with MKK-7 and vice versa, indicating that the 3 kinases form a stable complex in FLS. Confocal microscopy confirmed that JNK, MKK-4, and MKK-7 colocalized in the cytoplasm, with JNK migrating to the nucleus after IL-1 stimulation. The signal complex containing MKK-4, MKK-7, and JNK was functionally active and able to phosphorylate c-Jun after IL-1 stimulation of FLS. CONCLUSION: These studies demonstrate that JNK, MKK-4, and MKK-7 form an active signaling complex in FLS. This novel JNK signalsome is activated in response to IL-1 and migrates to the nucleus. The JNK signalsome represents a new target for therapeutic interventions designed to prevent joint destruction.
OBJECTIVE: The mitogen-activated protein (MAP) kinase JNK is a key regulator of interleukin-1 (IL-1)-induced collagenase gene expression and joint destruction in arthritis. Two upstream kinases, MKK-4 and MKK-7, have been identified as potential activators of JNK. However, the role of MAP kinase kinases (MAPKKs) and their functional organization within fibroblast-like synoviocytes (FLS) have not been defined. We therefore evaluated the interactions between the various MAP kinase components and determined their subcellular localization. METHODS: MKKs were identified by immunohistochemistry of rheumatoid arthritis (RA) and osteoarthritis (OA) synovium. Western blotting was used to determine the expression of FLS. Immunoprecipitation experiments using antibodies specific for MKK-4, MKK-7, and JNK were performed. Phosphospecific antibodies and immunohistochemistry were used to evaluate the activation state of synovial MKK-4 and MKK-7. Confocal microscopy was used to determine the subcellular location of the kinases. RESULTS: Immunohistochemistry studies demonstrated abundant MKK-4 and MKK-7 in RA and OA synovium, but the levels of phosphorylated kinases were significantly higher in RA synovium. MKK-4 and MKK-7 were constitutively expressed by cultured RA and OA FLS, and IL-1 stimulation resulted in rapid phosphorylation of both kinases. JNK was detected in MKK-4 and MKK-7 immunoprecipitates. Furthermore, MKK-4 coprecipitated with MKK-7 and vice versa, indicating that the 3 kinases form a stable complex in FLS. Confocal microscopy confirmed that JNK, MKK-4, and MKK-7 colocalized in the cytoplasm, with JNK migrating to the nucleus after IL-1 stimulation. The signal complex containing MKK-4, MKK-7, and JNK was functionally active and able to phosphorylate c-Jun after IL-1 stimulation of FLS. CONCLUSION: These studies demonstrate that JNK, MKK-4, and MKK-7 form an active signaling complex in FLS. This novel JNK signalsome is activated in response to IL-1 and migrates to the nucleus. The JNK signalsome represents a new target for therapeutic interventions designed to prevent joint destruction.
Authors: Camilla I Svensson; Tomoyuki Inoue; Deepa Hammaker; Akihisa Fukushima; Salvatore Papa; Guido Franzoso; Georg Schett; Maripat Corr; David L Boyle; Gary S Firestein Journal: Arthritis Rheum Date: 2009-11
Authors: Igor A Schepetkin; Liliya N Kirpotina; Deepa Hammaker; Irina Kochetkova; Andrei I Khlebnikov; Sergey A Lyakhov; Gary S Firestein; Mark T Quinn Journal: J Pharmacol Exp Ther Date: 2015-03-17 Impact factor: 4.030
Authors: Jennifer L Rogers; Donald S Serafin; Roman G Timoshchenko; Teresa K Tarrant Journal: Curr Allergy Asthma Rep Date: 2012-12 Impact factor: 4.806
Authors: Megan E Blewis; Brian J Lao; Kyle D Jadin; William J McCarty; William D Bugbee; Gary S Firestein; Robert L Sah Journal: Biotechnol Bioeng Date: 2010-05-01 Impact factor: 4.530