[No authors listed]
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 ILâ1βâstimulated catabolic degradation of cartilage by HDAC. An in vitro model of OA was generated using rat articular chondrocytes (rACs) treated with ILâ1β. The role of HDAC in ILâ1βâinduced gene expression was investigated using HDAC inhibitors and specific small interfering RNAs (siRNAs). The association of diverse mitogenâactivated protein kinase (MAPK) pathways was examined. The ILâ1βâinduced expression of a disintegrin and metalloproteinase with thrombospondin motifs (ADAMTS)â4 and ADAMTSâ5, and the production of collagen X and cyclooxygenaseâ2 in rACs was accompanied by the expression of HDAC4 and HDAC8, and were significantly downregulated by HDAC inhibitors and specific siRNAs. ILâ1βâinduced activation of extracellular signalâregulated kinase was downregulated by the HDAC inhibitor Trichostatin A, but not significantly by PCIâ34051. The activation of câJun Nâterminal 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 ILâ1βâinduced 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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