Cullin-3 regulates vascular smooth muscle function and arterial blood pressure via PPARγ and RhoA/Rho-kinase.

Cullin-3 regulates vascular smooth muscle function and arterial blood pressure via PPARγ and RhoA/Rho-kinase.
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Cullin-3通过PPARγ和RhoA/Rho-kinase调节血管平滑肌功能和动脉血压。

DOI:
10.1016/j.cmet.2012.08.011
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发表时间:
2012-10-03
期刊:
影响因子:
29
通讯作者:
Sigmund CD
Sigmund CD
中科院分区:
生物学1区
文献类型:
--
作者:
Pelham CJ;Ketsawatsomkron P;Groh S;Grobe JL;de Lange WJ;Ibeawuchi SR;Keen HL;Weatherford ET;Faraci FM;Sigmund CD

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核激素受体过氧化物酶体增殖物激活受体-γ (PPARγ) 的显性阴性突变通过未知机制导致高血压。转基因小鼠血管平滑肌中显性负性 PPARγ 的表达概括了高血压和血管功能障碍。显性负性 PPARγ 会增加 RhoA 和 Rho 激酶活性,抑制 Rho 激酶可恢复正常反应性并降低动脉压。 RhoBTB1 是 Cullin-3 RING E3 泛素连接酶复合物的组成部分,是 PPARγ 靶基因。 RhoBTB1、Cullin-3 和 neddylated Cullin-3 的减少与 Cullin-3 底物 RhoA 水平的增加相关。主动脉平滑肌细胞中 Cullin-3 的敲低或 cullin-RING 连接酶活性的抑制可增加 RhoA。 Cullin-RING 连接酶抑制通过 Rho 激酶依赖性机制增强正常小鼠主动脉环中激动剂介导的收缩,并增加体内动脉压。我们得出的结论是,Cullin-3 调节血管功能和动脉压,从而提供了 Cullin-3 突变与人类高血压之间的机制联系。
Dominant negative mutations in the nuclear hormone receptor peroxisome proliferator-activated receptor-γ (PPARγ) cause hypertension by an unknown mechanism. Hypertension and vascular dysfunction are recapitulated by expression of dominant negative PPARγ specifically in vascular smooth muscle of transgenic mice. Dominant negative PPARγ increases RhoA and Rho-kinase activity, and inhibition of Rho-kinase restores normal reactivity and reduces arterial pressure. RhoBTB1, a component of the Cullin-3 RING E3 ubiquitin ligase complex, is a PPARγ target gene. Decreased RhoBTB1, Cullin-3 and neddylated Cullin-3 correlated with increased levels of the Cullin-3 substrate RhoA. Knockdown of Cullin-3 or inhibition of cullin-RING ligase activity in aortic smooth muscle cells increased RhoA. Cullin-RING ligase inhibition enhanced agonist-mediated contraction in aortic rings from normal mice by a Rho-kinase-dependent mechanism, and increased arterial pressure in vivo. We conclude that Cullin-3 regulates vascular function and arterial pressure thus providing a mechanistic link between mutations in Cullin-3 and hypertension in humans.
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