Characterization of NF-kB-mediated inhibition of catechol-O-methyltransferase.

Characterization of NF-kB-mediated inhibition of catechol-O-methyltransferase.
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DOI:
10.1186/1744-8069-5-13
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发表时间:
2009-03-16
期刊:
影响因子:
3.3
通讯作者:
Diatchenko LB
Diatchenko LB
中科院分区:
医学3区
文献类型:
--
作者:
Tchivileva IE;Nackley AG;Qian L;Wentworth S;Conrad M;Diatchenko LB

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儿茶酚-O-甲基转移酶(COMT)是一种代谢儿茶酚胺的酶,最近被认为与疼痛的调节有关。具体来说,低 COMT 活性与人类疼痛感知增强和肌肉骨骼疼痛的发展以及啮齿类动物实验性疼痛敏感性增加有关。我们报告促炎细胞因子肿瘤坏死因子 α (TNFα) 下调星形胶质细胞中的 COMT mRNA 和蛋白质。对远端 COMT 启动子 (P2-COMT) 的检查揭示了核因子 κB (NF-κB) 的假定结合位点,核因子 κB 是炎症的关键调节因子和 TNFα 的靶标。克隆的 P2-COMT 启动子的细胞培养测定和功能缺失分析表明,TNFα 通过诱导 NF-κB 复合物募集到特定的 κB 结合位点来抑制星形胶质细胞中的 P2-COMT 活性。总的来说,我们的研究结果为 NF-κB 介导的中枢神经系统 COMT 表达抑制提供了第一个证据,表明 COMT 有助于炎性疼痛状态的发病机制。
Catechol-O-methyltransferase (COMT), an enzyme that metabolizes catecholamines, has recently been implicated in the modulation of pain. Specifically, low COMT activity is associated with heightened pain perception and development of musculoskeletal pain in humans as well as increased experimental pain sensitivity in rodents. We report that the proinflammatory cytokine tumor necrosis factor α (TNFα) downregulates COMT mRNA and protein in astrocytes. Examination of the distal COMT promoter (P2-COMT) reveals a putative binding site for nuclear factor κB (NF-κB), the pivotal regulator of inflammation and the target of TNFα. Cell culture assays and functional deletion analyses of the cloned P2-COMT promoter demonstrate that TNFα inhibits P2-COMT activity in astrocytes by inducing NF-κB complex recruitment to the specific κB binding site. Collectively, our findings provide the first evidence for NF-κB-mediated inhibition of COMT expression in the central nervous system, suggesting that COMT contributes to the pathogenesis of inflammatory pain states.
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