CTGF increases IL-6 expression in human synovial fibroblasts through integrin-dependent signaling pathway

Connective tissue growth factor (CTGF; also known as CCN2) is an inflammatory mediator, and shows elevated levels in regions of severe injury and inflammatory diseases. CTGF is abundantly expressed in osteoarthritis (OA). However, the relationship between CTGF and IL-6 in OA synovial fibroblasts (OA...

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Veröffentlicht in:PloS one 2012-12, Vol.7 (12), p.e51097-e51097
Hauptverfasser: Liu, Shan-Chi, Hsu, Chin-Jung, Chen, Hsien-Te, Tsou, Hsi-Kai, Chuang, Show-Mei, Tang, Chih-Hsin
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Chen, Hsien-Te
Tsou, Hsi-Kai
Chuang, Show-Mei
Tang, Chih-Hsin
description Connective tissue growth factor (CTGF; also known as CCN2) is an inflammatory mediator, and shows elevated levels in regions of severe injury and inflammatory diseases. CTGF is abundantly expressed in osteoarthritis (OA). However, the relationship between CTGF and IL-6 in OA synovial fibroblasts (OASFs) is mostly unknown. OASFs showed significant expression of CTGF, and expression was higher than in normal SFs. OASFs stimulation with CTGF induced concentration-dependent increases in IL-6 expression. CTGF mediated IL-6 production was attenuated by αvβ5 integrin neutralized antibody and apoptosis signal-regulating kinase 1 (ASK1) shRNA. Pretreatment with p38 inhibitor (SB203580), JNK inhibitor (SP600125), AP-1 inhibitors (Curcumin and Tanshinone IIA), and NF-κB inhibitors (PDTC and TPCK) also inhibited the potentiating action of CTGF. CTGF-mediated increase of NF-κB and AP-1 luciferase activity was inhibited by SB203580 and SP600125 or ASK1 shRNA or p38 and JNK mutant. Our results suggest that CTGF increased IL-6 production in OASFs via the αvβ5 integrin, ASK1, p38/JNK, and AP-1/NF-κB signaling pathways.
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CTGF is abundantly expressed in osteoarthritis (OA). However, the relationship between CTGF and IL-6 in OA synovial fibroblasts (OASFs) is mostly unknown. OASFs showed significant expression of CTGF, and expression was higher than in normal SFs. OASFs stimulation with CTGF induced concentration-dependent increases in IL-6 expression. CTGF mediated IL-6 production was attenuated by αvβ5 integrin neutralized antibody and apoptosis signal-regulating kinase 1 (ASK1) shRNA. Pretreatment with p38 inhibitor (SB203580), JNK inhibitor (SP600125), AP-1 inhibitors (Curcumin and Tanshinone IIA), and NF-κB inhibitors (PDTC and TPCK) also inhibited the potentiating action of CTGF. CTGF-mediated increase of NF-κB and AP-1 luciferase activity was inhibited by SB203580 and SP600125 or ASK1 shRNA or p38 and JNK mutant. 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CTGF is abundantly expressed in osteoarthritis (OA). However, the relationship between CTGF and IL-6 in OA synovial fibroblasts (OASFs) is mostly unknown. OASFs showed significant expression of CTGF, and expression was higher than in normal SFs. OASFs stimulation with CTGF induced concentration-dependent increases in IL-6 expression. CTGF mediated IL-6 production was attenuated by αvβ5 integrin neutralized antibody and apoptosis signal-regulating kinase 1 (ASK1) shRNA. Pretreatment with p38 inhibitor (SB203580), JNK inhibitor (SP600125), AP-1 inhibitors (Curcumin and Tanshinone IIA), and NF-κB inhibitors (PDTC and TPCK) also inhibited the potentiating action of CTGF. CTGF-mediated increase of NF-κB and AP-1 luciferase activity was inhibited by SB203580 and SP600125 or ASK1 shRNA or p38 and JNK mutant. 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pharmacology</topic><topic>Connective tissues</topic><topic>Curcumin</topic><topic>Cytokines</topic><topic>Fibroblasts</topic><topic>Fibroblasts - drug effects</topic><topic>Fibroblasts - enzymology</topic><topic>Fibroblasts - metabolism</topic><topic>Gene expression</topic><topic>Growth factors</topic><topic>Hospitals</topic><topic>Humans</topic><topic>Inflammation</topic><topic>Inflammatory diseases</topic><topic>Inhibitors</topic><topic>Integrins</topic><topic>Interleukin 6</topic><topic>Interleukin-6 - biosynthesis</topic><topic>Interleukin-6 - metabolism</topic><topic>JNK Mitogen-Activated Protein Kinases - metabolism</topic><topic>JNK protein</topic><topic>Kinases</topic><topic>Luciferase</topic><topic>MAP kinase</topic><topic>MAP Kinase Kinase Kinase 5 - metabolism</topic><topic>MAP Kinase Signaling System - drug effects</topic><topic>Materials science</topic><topic>Medicine</topic><topic>Models, Biological</topic><topic>Mutation</topic><topic>NF-kappa B - metabolism</topic><topic>NF-κB protein</topic><topic>Orthopedics</topic><topic>Osteoarthritis</topic><topic>p38 Mitogen-Activated Protein Kinases - 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CTGF is abundantly expressed in osteoarthritis (OA). However, the relationship between CTGF and IL-6 in OA synovial fibroblasts (OASFs) is mostly unknown. OASFs showed significant expression of CTGF, and expression was higher than in normal SFs. OASFs stimulation with CTGF induced concentration-dependent increases in IL-6 expression. CTGF mediated IL-6 production was attenuated by αvβ5 integrin neutralized antibody and apoptosis signal-regulating kinase 1 (ASK1) shRNA. Pretreatment with p38 inhibitor (SB203580), JNK inhibitor (SP600125), AP-1 inhibitors (Curcumin and Tanshinone IIA), and NF-κB inhibitors (PDTC and TPCK) also inhibited the potentiating action of CTGF. CTGF-mediated increase of NF-κB and AP-1 luciferase activity was inhibited by SB203580 and SP600125 or ASK1 shRNA or p38 and JNK mutant. Our results suggest that CTGF increased IL-6 production in OASFs via the αvβ5 integrin, ASK1, p38/JNK, and AP-1/NF-κB signaling pathways.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>23227240</pmid><doi>10.1371/journal.pone.0051097</doi><tpages>e51097</tpages><oa>free_for_read</oa></addata></record>
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subjects Antibodies
Apoptosis
Arthritis
Biocompatibility
Biology
Biomedical materials
Bone surgery
Cancer
Community colleges
Connective tissue growth factor
Connective Tissue Growth Factor - pharmacology
Connective tissues
Curcumin
Cytokines
Fibroblasts
Fibroblasts - drug effects
Fibroblasts - enzymology
Fibroblasts - metabolism
Gene expression
Growth factors
Hospitals
Humans
Inflammation
Inflammatory diseases
Inhibitors
Integrins
Interleukin 6
Interleukin-6 - biosynthesis
Interleukin-6 - metabolism
JNK Mitogen-Activated Protein Kinases - metabolism
JNK protein
Kinases
Luciferase
MAP kinase
MAP Kinase Kinase Kinase 5 - metabolism
MAP Kinase Signaling System - drug effects
Materials science
Medicine
Models, Biological
Mutation
NF-kappa B - metabolism
NF-κB protein
Orthopedics
Osteoarthritis
p38 Mitogen-Activated Protein Kinases - metabolism
Polyclonal antibodies
Receptors, Vitronectin - metabolism
Rodents
Signal transduction
Signal Transduction - drug effects
Signaling
Synovial Membrane - pathology
Transcription Factor AP-1 - metabolism
Transcription factors
Tumor necrosis factor-TNF
title CTGF increases IL-6 expression in human synovial fibroblasts through integrin-dependent signaling pathway
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