The epoxygenases CYP2J2 activates the nuclear receptor PPARalpha in vitro and in vivo.

The epoxygenases CYP2J2 activates the nuclear receptor PPARalpha in vitro and in vivo.
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DOI:
10.1371/journal.pone.0007421
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发表时间:
2009-10-12
期刊:
影响因子:
3.7
通讯作者:
Bishop-Bailey D
Bishop-Bailey D
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Wray JA;Sugden MC;Zeldin DC;Greenwood GK;Samsuddin S;Miller-Degraff L;Bradbury JA;Holness MJ;Warner TD;Bishop-Bailey D

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过氧化物酶体增殖物激活受体(PPARs)是一个由三种(PPARα、-β/δ和-γ)核受体组成的家族。特别是,PPARα参与调节脂肪酸代谢、细胞生长和炎症。PPARα介导心脏空腹反应,增加脂肪酸代谢,降低葡萄糖利用,是贝特类降脂药物的靶点。然而,关于过氧化物酶体增殖物激活受体配体的内源性产生知之甚少。CYP 2 J2是一种脂质代谢细胞色素P450,产生抗炎介质,被认为是人类心脏中的主要环氧酶。CYP 2 J2在体外的表达可激活PPAR反应,特别是对PPARα的偏好。CYP 2 J2的产物8,9-和11-12-EET也能激活PPARα。在体外,选择性配体激活的PPARα可诱导心肌组织中的PPARα靶基因丙酮酸脱氢酶激酶(PDK)4。在体内,在心脏特异性CYP 2 J2转基因小鼠中,禁食选择性增加PDK 4的表达。我们的研究结果表明,CYP 2 J2在体外和体内产生PPARα配体,并表明脂质代谢CYP是整合整体脂质变化的转录信号事件的主要候选者。
Peroxisome proliferator-activated receptors (PPARs) are a family of three (PPARα, -β/δ, and -γ) nuclear receptors. In particular, PPARα is involved in regulation of fatty acid metabolism, cell growth and inflammation. PPARα mediates the cardiac fasting response, increasing fatty acid metabolism, decreasing glucose utilisation, and is the target for the fibrate lipid-lowering class of drugs. However, little is known regarding the endogenous generation of PPAR ligands. CYP2J2 is a lipid metabolising cytochrome P450, which produces anti-inflammatory mediators, and is considered the major epoxygenase in the human heart. Expression of CYP2J2 in vitro results in an activation of PPAR responses with a particular preference for PPARα. The CYP2J2 products 8,9- and 11-12-EET also activate PPARα. In vitro, PPARα activation by its selective ligand induces the PPARα target gene pyruvate dehydrogenase kinase (PDK)4 in cardiac tissue. In vivo, in cardiac-specific CYP2J2 transgenic mice, fasting selectively augments the expression of PDK4. Our results establish that CYP2J2 produces PPARα ligands in vitro and in vivo, and suggests that lipid metabolising CYPs are prime candidates for the integration of global lipid changes to transcriptional signalling events.
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