title: Endothelin-1 in osteoarthritic chondrocytes triggers nitric oxide production and upregulates collagenase production.
abstract: The mechanism of endothelin-1 (ET-1)-induced nitric oxide (NO) production, MMP-1 production and MMP-13 production was investigated in human osteoarthritis chondrocytes. The cells were isolated from human articular cartilage obtained at surgery and were cultured in the absence or presence of ET-1 with or without inhibitors of protein kinase or LY83583 (an inhibitor of soluble guanylate cyclase and of cGMP). MMP-1, MMP-13 and NO levels were then measured by ELISA and Griess reaction, respectively. Additionally, inducible nitric oxide synthase (iNOS) and phosphorylated forms of p38 mitogen-activated protein kinase, p44/42, stress-activated protein kinase/Jun-N-terminal kinase and serine-threonine Akt kinase were determined by western blot. Results show that ET-1 greatly increased MMP-1 and MMP-13 production, iNOS expression and NO release. LY83583 decreased the production of both metalloproteases below basal levels, whereas the inhibitor of p38 kinase, SB202190, suppressed ET-1-stimulated production only. Similarly, the ET-1-induced NO production was partially suppressed by the p38 kinase inhibitor and was completely suppressed by the protein kinase A kinase inhibitor KT5720 and by LY83583, suggesting the involvement of these enzymes in relevant ET-1 signalling pathways. In human osteoarthritis chondrocytes, ET-1 controls the production of MMP-1 and MMP-13. ET-1 also induces NO release via iNOS induction. ET-1 and NO should thus become important target molecules for future therapies aimed at stopping cartilage destruction.
authors.affiliation: Research Center, Sainte-Justine Hospital, Montreal, Quebec, Canada. crismanacu@yahoo.ca
authors.forename: Christina Alexandra
authors.initials: CA
authors.lastname: Manacu
authors.forename: Johanne
authors.initials: J
authors.lastname: Martel-Pelletier
authors.forename: Marjolaine
authors.initials: M
authors.lastname: Roy-Beaudry
authors.forename: Jean-Pierre
authors.initials: JP
authors.lastname: Pelletier
authors.forename: Julio C
authors.initials: JC
authors.lastname: Fernandes
authors.forename: Fazool S
authors.initials: FS
authors.lastname: Shipkolye
authors.forename: Dragoslav R
authors.initials: DR
authors.lastname: Mitrovic
authors.forename: Florina
authors.initials: F
authors.lastname: Moldovan
mesh_terms: D000634:Aminoquinolines / Q000494:pharmacology; D017209:Apoptosis / Q000187:drug effects; D002227:Carbazoles / Q000494:pharmacology; D002358:Cartilage, Articular / Q000473:pathology*; D002478:Cells, Cultured / Q000187:drug effects / Q000378:metabolism; D019902:Chondrocytes / Q000187:drug effects* / Q000378:metabolism; D017364:Collagenases / Q000096:biosynthesis* / Q000235:genetics; D054746:Cyclic AMP-Dependent Protein Kinase Type II; D017868:Cyclic AMP-Dependent Protein Kinases / Q000037:antagonists & inhibitors; D006152:Cyclic GMP / Q000037:antagonists & inhibitors; D019332:Endothelin-1 / Q000494:pharmacology*; D004790:Enzyme Induction / Q000187:drug effects; D005260:Female; D006162:Guanylate Cyclase / Q000037:antagonists & inhibitors; D006801:Humans; D007093:Imidazoles / Q000494:pharmacology; D007211:Indoles / Q000494:pharmacology; D020935:MAP Kinase Signaling System / Q000187:drug effects; D008297:Male; D020781:Matrix Metalloproteinase 1 / Q000096:biosynthesis / Q000235:genetics; D053509:Matrix Metalloproteinase 13; D008875:Middle Aged; D009569:Nitric Oxide / Q000096:biosynthesis*; D052247:Nitric Oxide Synthase Type II / Q000096:biosynthesis / Q000235:genetics; D020370:Osteoarthritis, Knee / Q000378:metabolism / Q000473:pathology*; D010766:Phosphorylation / Q000187:drug effects; D011499:Protein Processing, Post-Translational / Q000187:drug effects; D011725:Pyridines / Q000494:pharmacology; D011758:Pyrroles / Q000494:pharmacology; D015398:Signal Transduction / Q000187:drug effects; D048051:p38 Mitogen-Activated Protein Kinases / Q000037:antagonists & inhibitors
chemical_list: D000634:Aminoquinolines; D002227:Carbazoles; D019332:Endothelin-1; D007093:Imidazoles; D007211:Indoles; D011725:Pyridines; D011758:Pyrroles; D009569:Nitric Oxide; C057416:KT 5720; C041715:6-anilino-5,8-quinolinedione; D052247:Nitric Oxide Synthase Type II; D054746:Cyclic AMP-Dependent Protein Kinase Type II; D017868:Cyclic AMP-Dependent Protein Kinases; D048051:p38 Mitogen-Activated Protein Kinases; D017364:Collagenases; C507079:MMP13 protein, human; D053509:Matrix Metalloproteinase 13; D020781:Matrix Metalloproteinase 1; D006162:Guanylate Cyclase; D006152:Cyclic GMP; C090942:4-(4-fluorophenyl)-2-(4-hydroxyphenyl)-5-(4-pyridyl)imidazole
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