Repression of beta-catenin signaling by PPAR gamma ligands.

Repression of beta-catenin signaling by PPAR gamma ligands.
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DOI:
10.1016/j.ejphar.2010.03.010
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发表时间:
2010-06-25
影响因子:
5
通讯作者:
Carson, Dennis A.
Carson, Dennis A.
中科院分区:
医学2区
文献类型:
--
作者:
Lu, Desheng;Carson, Dennis A.

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Wnt/β-catenin信号通路的异常激活在各种人类恶性肿瘤的发生中起着至关重要的作用。研究表明,β-catenin与PPARγ之间存在直接的相互作用。我们在一项依赖于β-catenin激活TCF/LEF转录因子的报告基因试验中检测了15种已报道的PPAR配体的作用;只有噻唑烷二酮类PPARγ激动剂曲格列酮、罗格列酮和吡格列酮以及非噻唑烷二酮类PPARγ激活剂GW 1929以PPARγ依赖性方式抑制β-catenin诱导的转录。哺乳动物单杂交实验结果表明,功能性的PPARγ是配体依赖性抑制β-catenin反式激活所必需的。然而,PPARγ激活剂Fmoc-Leu不能抑制β-catenin介导的信号传导及其反式激活活性。这些结果表明,对于PPARγ激动剂的β-连环蛋白拮抗活性,PPARγ的活化是必需的,但不是充分的,并且抑制性化合物直接干扰β-连环蛋白反式激活活性。
Aberrant activation of the Wnt/β-catenin signaling pathway plays a crucial role in oncogenesis of various human malignancies. It has been demonstrated that there is a direct interaction between β-catenin and PPARγ. Here we examined the effects of fifteen reported PPAR ligands in a reporter gene assay that is dependent on β-catenin activation of TCF/LEF transcription factors; only the thiazolidinedione PPARγ agonists troglitazone, rosiglitazone and pioglitazone, and a non-thiazolidinedione PPARγ activator GW1929 inhibited β-catenin-induced transcription in a PPARγ dependent fashion. The results from mammalian one-hybrid experiments showed that functional PPARγ was necessary for ligand-dependent inhibition of β-catenin transactivation. However, a PPARγ activator Fmoc-Leu could not repress β-catenin-mediated signaling and its transactivation activity. These results indicate that activation of PPARγ is necessary, but not sufficient, for the β-catenin antagonistic activity of a PPARγ agonist, and that the inhibitory compounds interfere directly with β-catenin transactivation activity.
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