Differential expression of COX-2 in osteoarthritis and rheumatoid arthritis

Liu, G.Y.; Zhao, Can; Li, X.F.; Yang, Xiao

doi:10.4238/2015.october.21.7

Cited by 42 publications

(25 citation statements)

References 18 publications

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“…Suppression of PGE2 and MMP expression was indicated to inhibit cartilage degradation by pomegranate fruit extracts in a model of posttraumatic osteoarthritis (27). Another study reported that patients with OA exhibited significantly higher COX-2 levels compared with the healthy control group (28). In the current study, findings demonstrated that hesperidin significantly decreased PGE2 and COX-2 expression in IL-1β-stimulated human OA chondrocytes compared with PBS-treated cells.…”

Section: Discussionsupporting

confidence: 60%

Hesperidin protects against IL‑1β‑induced inflammation in human osteoarthritis chondrocytes

Chen

Xie

et al. 2018

Exp Ther Med

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Hesperidin is a vitamin P flavonoid compound primarily present in citrus fruits, which possesses an anti-inflammatory effect. The functional role of hesperidin in interleukin (IL)-1β-stimulated human osteoarthritis (OA) chondrocytes is still unknown. In the present study, anti-inflammatory effects of hesperidin in IL-1β-stimulated chondrocytes were investigated. The results demonstrated that hesperidin treatment markedly decreased nitric oxide and prostaglandin E2 production and markedly downregulated inducible nitric oxide synthase and cyclooxygenase-2 expression in IL-1β-stimulated OA chondrocytes. In addition, hesperidin markedly reduced IL-1β-induced matrix metalloproteinase (MMP)-3 and MMP-13 expression in human OA chondrocytes. Furthermore, hesperidin markedly decreased the activation of nuclear factor (NF)-κB in human OA chondrocytes. In conclusion, it was revealed for the first time that hesperidin inhibited inflammatory responses in IL-1β-stimulated human chondrocytes, potentially through inhibiting the activation of the NF-κB signaling pathway. These data suggest that hesperidin may be a potential agent for the treatment of OA.

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Section: Discussionsupporting

confidence: 60%

Hesperidin protects against IL‑1β‑induced inflammation in human osteoarthritis chondrocytes

Chen

Xie

et al. 2018

Exp Ther Med

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“…The activity of this was increased in the case of psoriasis. Since the activation of cyclooxygenases leads to the generation of pro-inflammatory eicosanoids, increased COX-1/2 activity may contribute to their over-generation in similar ways as observed for other inflammatory diseases [ 65 ].…”

Section: Discussionmentioning

confidence: 99%

Pathophysiological Alterations of Redox Signaling and Endocannabinoid System in Granulocytes and Plasma of Psoriatic Patients

Ambrożewicz

Wójcik

Wroński³

et al. 2018

Cells

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Inflammatory granulocytes are characterized by an oxidative burst, which may promote oxidative stress and lipid modification both in affected tissues and on a systemic level. On the other hand, redox signaling involving lipid peroxidation products acting as second messengers of free radicals play important yet not fully understood roles in the pathophysiology of inflammation and various stress-associated disorders. Therefore, the aim of this study was to evaluate the onset of oxidative stress and alterations of enzyme-dependent lipid metabolism resulting from redox imbalance in granulocytes and plasma obtained from patients with psoriasis vulgaris or psoriatic arthritis in comparison to the healthy subjects. The results obtained revealed enhanced activity of pro-oxidant enzymes nicotinamide adenine dinucleotide phosphate (NADPH) and xanthine oxidases in granulocytes with a decrease of enzymatic and non-enzymatic antioxidants in the plasma of psoriatic patients. The nuclear factor erythroid 2–related factor 2 (Nrf2) and its regulators were increased in both forms of psoriasis while heme oxygenase 1 levels were increased only in psoriasis vulgaris. The redox imbalance was associated with decreased levels of phospholipids and of free polyunsaturated fatty acids but with enhanced activity of enzymes involved in lipid metabolism (phospholipase A2, acetylhydrolase PAF, cyclooxygenases 1 and 2) and increased lipid peroxidation products 4-hydroxynonenal, isoprostanes, and neuroprostanes. Increased endocannabinoids and G protein-coupled receptor 55 were observed in both forms of the disease while expression of the cannabinoid type 1 receptor (CB1) was increased only in patients with psoriatic arthritis, which is opposite to the cannabinoid type 2 receptor. This receptor was increased only in psoriasis vulgaris. Changes in protein expression promoted the apoptosis of granulocytes by increased caspases mainly in psoriasis vulgaris. This study indicates that inhibition of the Nrf2 pathway in psoriatic arthritis promotes a redox imbalance. In addition, increased expression of CB1 receptors leads to increased oxidative stress, lipid modifications, and inflammation, which, in turn, may promote the progression of psoriasis into the advanced, arthritic form of the disease.

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“…In addition to ADAMTS, cyclooxygenase (COX)-2 also serves a vital role in cartilage metabolism and inflammation associated with OA. It is widely used in medical reagents, including Celebrex, for its anti-inflammatory action ( 10 , 28 , 29 ).…”

Section: Introductionmentioning

confidence: 99%

Histone deacetylase-4 and histone deacetylase-8 regulate interleukin-1β-induced cartilage catabolic degradation through MAPK/JNK and ERK pathways

et al. 2018

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Interleukin-1β (IL-1β)-induced inflammatory response is associated with osteoarthritis (OA) and its development. Histone deacetylase (HDAC) may be involved in regulating this pathogenesis, but the mechanism has yet to be elucidated. The aim of the present study was to investigate the mechanism underlying the regulation of IL-1β-stimulated catabolic degradation of cartilage by HDAC. An in vitro model of OA was generated using rat articular chondrocytes (rACs) treated with IL-1β. The role of HDAC in IL-1β-induced gene expression was investigated using HDAC inhibitors and specific small interfering RNAs (siRNAs). The association of diverse mitogen-activated protein kinase (MAPK) pathways was examined. The IL-1β-induced expression of a disintegrin and metalloproteinase with thrombospondin motifs (ADAMTS)-4 and ADAMTS-5, and the production of collagen X and cyclo-oxygenase-2 in rACs was accompanied by the expression of HDAC4 and HDAC8, and were significantly downregulated by HDAC inhibitors and specific siRNAs. IL-1β-induced activation of extracellular signal-regulated kinase was downregulated by the HDAC inhibitor Trichostatin A, but not significantly by PCI-34051. The activation of c-Jun N-terminal kinase was observably downregulated by the latter, but only slightly by the former. These results suggest that HDAC4 and HDAC8 may serve as key upstream mediators of MAPK in regulating the IL-1β-induced cartilage catabolic and degradation. Therefore, inhibiting HDAC4 or HDAC8 or both may be a promising therapeutic strategy in preventing and treating OA.

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Differential expression of COX-2 in osteoarthritis and rheumatoid arthritis

Cited by 42 publications

References 18 publications

Hesperidin protects against IL‑1β‑induced inflammation in human osteoarthritis chondrocytes

Hesperidin protects against IL‑1β‑induced inflammation in human osteoarthritis chondrocytes

Pathophysiological Alterations of Redox Signaling and Endocannabinoid System in Granulocytes and Plasma of Psoriatic Patients

Histone deacetylase-4 and histone deacetylase-8 regulate interleukin-1β-induced cartilage catabolic degradation through MAPK/JNK and ERK pathways

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