Selective inhibition of mitochondrial JNK signaling achieved using peptide mimicry of the Sab kinase interacting motif-1 (KIM1).

Selective inhibition of mitochondrial JNK signaling achieved using peptide mimicry of the Sab kinase interacting motif-1 (KIM1).
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DOI:
10.1021/cb200062a
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发表时间:
2011-08-19
影响因子:
4
通讯作者:
LoGrasso, Philip V.
LoGrasso, Philip V.
中科院分区:
生物学2区
文献类型:
--
作者:
Chambers, Jeremy W.;Cherry, Lisa;Laughlin, John D.;Figuera-Losada, Mariana;LoGrasso, Philip V.

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c-jun N-末端激酶(JNK)响应于应激刺激,导致促凋亡蛋白的激活和转录。此外,JNK线粒体定位已被报道。为了选择性地靶向线粒体JNK信号传导,我们利用JNK与其线粒体支架Sab的相互作用,使用小干扰RNA(siRNA)和对应于Sab的KIM 1结构域的细胞渗透性肽。这种相互作用的基因沉默和肽干扰破坏了JNK向线粒体的转运,并降低了Bcl-2的磷酸化,而对c-Jun磷酸化或AP-1转录没有显著影响。相反,JNK抑制肽(TI-JIP 1)阻止了这三种功能。在茴香霉素应激的HeLa细胞中也证明了Tat-SabKIM 1的选择性,其中Tat-SabKIM 1阻止Bcl-2磷酸化、细胞死亡、线粒体膜电位损失和超氧化物生成,但不阻止c-Jun磷酸化。相反,TI-JIP 1阻止了所有上述应激诱导的事件。该探针引入了一种在不干预JNK核功能的情况下评估线粒体上JNK介导的事件的方法。
The c-jun N-terminal kinases (JNKs) are responsive to stress stimuli leading to activation of proapoptotic proteins and transcription. Additionally, JNK mitochondrial localization has been reported. To selectively target mitochondrial JNK signaling, we exploited JNKs interaction with its mitochondrial scaffold, Sab, using small interfering RNAs (siRNAs) and a cell permeable peptide corresponding to the KIM1 domain of Sab. Gene silencing and peptide interference of this interaction disrupted JNK translocation to the mitochondria and reduced phosphorylation of Bcl-2 without significant impact on c-Jun phosphorylation or AP-1 transcription. In contrast, the JNK inhibitory peptide (TI-JIP1) prevented these three functions. Tat-SabKIM1 selectivity was also demonstrated in anisomycin-stressed HeLa cells where Tat-SabKIM1 prevented Bcl-2 phosphorylation, cell death, loss of mitochondrial membrane potential, and superoxide generation, but not c-Jun phosphorylation. Conversely, TI-JIP1 prevented all aforementioned stress-induced events. This probe introduces a means to evaluate JNK-mediated events on the mitochondria without intervening in nuclear functions of JNK.
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