AUF1 is upregulated by angiotensin II to destabilize cardiac Kv4.3 channel mRNA.
AUF1 is upregulated by angiotensin II to destabilize cardiac Kv4.3 channel mRNA.
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AUF1 被血管紧张素 II 上调,从而破坏心脏 Kv4.3 通道 mRNA 的稳定性。
DOI:
10.1016/j.yjmcc.2008.08.004
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发表时间:
2008
影响因子:
5
通讯作者:
Levitan,EdwinS
中科院分区:
文献类型:
--
作者:
Zhou,Chaoming;Vignere,ChandraZ;Levitan,EdwinS
Expression of cardiac myocyte Kv4 channels (Kv4.3 for human, Kv4.2 and Kv4.3 for rodents) is downregulated with hypertrophy in vivo leading to a decrease in the transient outward current (Ito). This effect is recapitulated in vitro with rat neonatal cardiac myocytes treated with angiotensin II (Ang II), which acts via AT1receptors, NADPH oxidase and p38 MAP kinase to destabilize the 3′ untranslated region (3′UTR) of the Kv4.3 channel messenger RNA (mRNA). Here deletion analysis and mutagenesis identify an AU-rich element (ARE) in the Kv4.3 3′UTR that is required for Ang II-induced destabilization. Overexpression of AUF1 (ARE/poly-(U)-binding/degradation factor 1), an RNA destabilizing protein, mimics and occludes the Ang II effect, while RNA interference targeted against AUF1 blocks the Ang II effect on the Kv4.3 3′UTR. Ang II upregulates AUF1 by activating AT1receptors, NADPH oxidase and p38 MAP kinase. Finally, pull-down assays establish that Ang II increases AUF1 binding to the ARE required for destabilization, while binding of the mRNA stabilizing protein HuR is unaffected. Hence, Ang II acts via AT1receptors, NADPH oxidase and p38 MAP kinase to upregulate AUF1, which in turn binds to an ARE in the Kv4.3 3′UTR to destabilize the channel mRNA.
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