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• W2893348799 abstract "Background/Aims: Both physiologic remodeling and pathologic regeneration of cartilage tissue rely upon chondrocyte functions and are benefited from factors that promote viability and inhibit apoptosis of the cell, and associated mechanisms. High level of reactive oxygen species (ROS) and proinflammatory cytokines activate apoptosis signaling and initiate cell death, which can be attenuated by antioxidants. This study examined the effect of catalase (CAT) on ROS and tumor necrosis factor-α (TNF-α)-induced apoptosis in human C28/I2 chondrocytes cultured in monolayer. Methods: Chondrocytes were treated with diluted CAT in the presence or absence of TNF-α and compared to untreated cells. Levels of hydrogen peroxide (H2O2) and mitochondrial membrane potential (Δψm) were measured using fluorescent labeling, cell apoptosis was assayed by flow cytometry using Annexin V/propidium iodide (PI) staining, gene expression was detected by quantitative real time polymerase chain reaction (qRT-PCR) and the proteins were investigated by Western blotting. Results: CAT effectively reduced the intracellular ROS caused by the monolayer culture system, enhanced the Δψm depending on the presence of TNF-α and promoted morphological features at sub-cellular level. CAT also attenuated the TNF-α-upregulated expression of factors/mediators of extrinsic cell death cascade and apoptotic caspases, ultimately resulted in promoted cellular viability. Conclusion: The anti-apoptotic effect of CAT on chondrocytes via scavenging ROS and suppressing TNF-α-induced cell apoptosis by TNF/TNF receptor (TNFR) mediated death signaling pathway and potentiate CAT as a complementary agent beneficial to cartilage remodeling and regeneration in vivo, and cell-based therapies of cartilage repair demanding viable cells expanded ex vivo." @default.
• W2893348799 created "2018-10-05" @default.
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• W2893348799 date "2018-01-01" @default.
• W2893348799 modified "2023-10-14" @default.
• W2893348799 title "Catalase Enhances Viability of Human Chondrocytes in Culture by Reducing Reactive Oxygen Species and Counteracting Tumor Necrosis Factor-α-Induced Apoptosis" @default.
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• W2893348799 doi "https://doi.org/10.1159/000493841" @default.
• W2893348799 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30261500" @default.
• W2893348799 hasPublicationYear "2018" @default.
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