Ye Jianping
Pennington Biomedical Research Center, Louisiana State University System, 6400 Perkins Road, Baton Rouge, LA 70808, USA.
Biochem Biophys Res Commun. 2008 Sep 26;374(3):405-8. doi: 10.1016/j.bbrc.2008.07.068. Epub 2008 Jul 23.
The nuclear receptor PPARgamma is a lipid sensor that regulates lipid metabolism through gene transcription. Inhibition of PPARgamma activity by TNF-alpha is involved in pathogenesis of insulin resistance, atherosclerosis, inflammation, and cancer cachexia. PPARgamma activity is regulated by TNF-alpha at pre-translational and post-translational levels. Activation of serine kinases including IKK, ERK, JNK, and p38 may be involved in the TNF-regulation of PPARgamma. Of the four kinases, IKK is a dominant signaling molecule in the TNF-regulation of PPARgamma. IKK acts through at least two mechanisms: inhibition of PPARgamma expression and activation of PPARgamma corepressor. In this review article, literature is reviewed with a focus on the mechanisms of PPARgamma inhibition by TNF-alpha.
核受体PPARγ是一种脂质传感器,通过基因转录调节脂质代谢。肿瘤坏死因子-α(TNF-α)对PPARγ活性的抑制作用与胰岛素抵抗、动脉粥样硬化、炎症及癌症恶病质的发病机制有关。PPARγ活性在翻译前和翻译后水平均受到TNF-α的调节。包括IKK、ERK、JNK和p38在内的丝氨酸激酶的激活可能参与了TNF对PPARγ的调节。在这四种激酶中,IKK是TNF调节PPARγ过程中的主要信号分子。IKK至少通过两种机制发挥作用:抑制PPARγ表达和激活PPARγ共抑制因子。在这篇综述文章中,我们将重点回顾关于TNF-α抑制PPARγ机制的相关文献。