Involvement of 15-lipoxygenase in the inflammatory arthritis

Journal of Cellular Biochemistry
Ming-Yueh WuWen-Mei Fu

Abstract

15-Lipoxygenase (15-LOX) is involved in many pathological processes. The aim of this study is to examine the role of 15-LOX in the matrix metalloproteinase (MMP) expression and inflammatory arthritis. It was found that treatment of 15-LOX downstream product of 15-(S)-HETE (15-S-hydroxyeicosatetraenoic acid) increased the mRNA and protein levels of MMP-2 in rheumatoid arthritis synovial fibroblast (RASF) derived from rheumatoid arthritis patients. The enhancement effect of 15-(S)-HETE was antagonized by the addition of LY294002 (PI3K inhibitor) and PDTC (NF-κB inhibitor). Treatment of 15-(S)-HETE increased the phosphorylation of AKT, nuclear translocation of p65 and the breakdown of IκBα. TNF-α and IL-1β are the key cytokines involved in arthritis and also increase the activity of MMP-2 in RASF, which was antagonized by pretreatment with 15-LOX inhibitor PD146176 or knockdown of 15-LOX. It was also found that these two cytokines increased the expression of 15-LOX in RASF. Treatment of glucocorticoid but not NSAIDs inhibited 15-(S)-HETE-induced expression of MMP-2. In comparison with wild-type mice, adjuvant-induced arthritis and MMP-2 expression in synovial membrane were markedly inhibited in 15-LOX knockout (KO) mice. These res...Continue Reading

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