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- W2109577037 abstract "Abstract 5-Lipoxygenase (5-LO), which catalyzes the first two steps in leukotriene biosynthesis, is a target for pharmacological treatment of inflammatory disorders. Previous studies have shown that B-lymphocytes express 5-LO. Here we demonstrate that several stimuli of cell stress such as osmotic shock (sorbitol, NaCl), oxidative stress (hydrogen peroxide, diamide), chemical stress sodium arsenite, and inflammatory cytokines enhanced cellular 5-LO activity in a B cell line (BL41-E95-A), when added simultaneously with ionophore plus arachidonate. It is interesting that sorbitol alone was sufficient for 5-LO product formation in the presence of exogenous arachidonic acid. These stimuli also activated p38 mitogen-activated protein (MAP) kinase and downstream MAP kinase-activated protein kinases in BL41-E95-A cells, which could phosphorylate 5-LO or heat shock protein 27 in vitro. The p38 MAP kinase inhibitor SB203580 abolished stress-induced leukotriene synthesis in B cells, without inhibition of 5-LO catalytic activity in cell-free systems. Our results indicate that p38 MAP kinase activation by cell stress is required for efficient leukotriene synthesis in B-lymphocytes." @default.
- W2109577037 created "2016-06-24" @default.
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- W2109577037 date "2001-11-01" @default.
- W2109577037 modified "2023-10-17" @default.
- W2109577037 title "p38 MAP kinase mediates stress-induced leukotriene synthesis in a human B-lymphocyte cell line" @default.
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- W2109577037 doi "https://doi.org/10.1189/jlb.70.5.830" @default.
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