共查询到20条相似文献,搜索用时 31 毫秒
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Steer JH Kroeger KM Abraham LJ Joyce DA 《The Journal of biological chemistry》2000,275(24):18432-18440
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Shi L Kishore R McMullen MR Nagy LE 《American journal of physiology. Cell physiology》2002,282(6):C1205-C1211
Lipopolysaccharide (LPS) is a potent activator of tumor necrosis factor-alpha (TNF-alpha) production by macrophages. LPS stimulates the phosphorylation of extracellular signal-regulated kinase (ERK) 1/2 and increases TNF-alpha mRNA and protein accumulation in RAW 264.7 murine macrophages. However, the role of ERK1/2 activation in mediating LPS-stimulated TNF-alpha production is not well understood. Inhibition of ERK1/2 activation with PD-98059 or overexpression of dominant negative ERK1/2 decreased LPS-induced TNF-alpha mRNA quantity. LPS rapidly increased early growth response factor (Egr)-1 binding to the TNF-alpha promoter; this response was blunted in cells treated with PD-98059 or transfected with dominant-negative ERK1/2. Using a chloramphenicol acetyltransferase reporter gene linked to the Egr-1 promoter, we show that LPS increased Egr-1 promoter activity via an ERK1/2-dependent mechanism. These results delineate the role of ERK1/2 activation of Egr-1 activity in mediating LPS-induced increases in TNF-alpha mRNA expression in macrophages. 相似文献
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Morello S Ito K Yamamura S Lee KY Jazrawi E Desouza P Barnes P Cicala C Adcock IM 《Journal of immunology (Baltimore, Md. : 1950)》2006,177(10):7173-7183
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