Muscle ring finger protein-1 inhibits PKC{epsilon} activation and prevents cardiomyocyte hypertrophy.

Muscle ring finger protein-1 inhibits PKC{epsilon} activation and prevents cardiomyocyte hypertrophy.
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DOI:
10.1083/jcb.200402033
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发表时间:
2004-12-20
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Patterson C
Patterson C
中科院分区:
其他
文献类型:
--
作者:
Arya R;Kedar V;Hwang JR;McDonough H;Li HH;Taylor J;Patterson C

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许多努力集中在表征与心脏肥大相关的信号转导级联。尽管如此,我们对抑制肥大生长的机制仍然知之甚少。我们定义了一种由肌肉环指蛋白-1 (MURF1) 调节的新型抗肥大信号通路,该通路可抑制新生大鼠心室肌细胞中激动剂刺激的 PKC 介导的信号反应。 MURF1 与活化蛋白激酶 C (RACK1) 受体相互作用,并在用去氧肾上腺素或 PMA 激活后与 RACK1 共定位。与这种激动剂刺激的相互作用同时发生,MURF1 阻断 PKCε 易位至粘着斑,这是肥厚信号级联中的一个关键事件。 MURF1 抑制粘着斑形成,下游效应器 ERK1/2 的活性在 MURF1 存在时也会受到抑制。 MURF1 抑制去氧肾上腺素诱导(但不抑制 IGF-1 诱导)的细胞大小增加。这些发现证实,MURF1 是 PKC 依赖性肥大反应的关键调节因子,可以减弱心肌细胞肥大,这可能对临床心脏肥大的病理生理学具有重要意义。
Much effort has focused on characterizing the signal transduction cascades that are associated with cardiac hypertrophy. In spite of this, we still know little about the mechanisms that inhibit hypertrophic growth. We define a novel anti-hypertrophic signaling pathway regulated by muscle ring finger protein-1 (MURF1) that inhibits the agonist-stimulated PKC-mediated signaling response in neonatal rat ventricular myocytes. MURF1 interacts with receptor for activated protein kinase C (RACK1) and colocalizes with RACK1 after activation with phenylephrine or PMA. Coincident with this agonist-stimulated interaction, MURF1 blocks PKCε translocation to focal adhesions, which is a critical event in the hypertrophic signaling cascade. MURF1 inhibits focal adhesion formation, and the activity of downstream effector ERK1/2 is also inhibited in the presence of MURF1. MURF1 inhibits phenylephrine-induced (but not IGF-1–induced) increases in cell size. These findings establish that MURF1 is a key regulator of the PKC-dependent hypertrophic response and can blunt cardiomyocyte hypertrophy, which may have important implications in the pathophysiology of clinical cardiac hypertrophy.
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