PRAS40 is an integral regulatory component of erythropoietin mTOR signaling and cytoprotection.

PRAS40 is an integral regulatory component of erythropoietin mTOR signaling and cytoprotection.
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DOI:
10.1371/journal.pone.0045456
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Maiese K
Maiese K
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Chong ZZ;Shang YC;Wang S;Maiese K

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针对神经退行性疾病的哺乳动物雷帕霉素靶蛋白(mTOR)信号转导的新兴策略可能会为许多困难的疾病实体带来有效的治疗。在此,我们表明,促红细胞生成素(EPO),一种治疗神经系统疾病的新药物,通过磷脂酰肌醇-3-激酶(PI 3-K)/蛋白激酶B(Akt)依赖性激活mTOR信号传导和磷酸化p70核糖体S6激酶(p70 S6 K)下游途径,在氧-葡萄糖剥夺的氧化应激模型中预防凋亡SH-SY5 Y细胞损伤,真核起始因子4E结合蛋白1(4EBP 1)和富含脯氨酸的Akt底物40 kDa(PRAS 40)。PRAS 40是一个重要的调节组分,单独或与EPO信号转导结合,可以通过凋亡caspase 3激活来决定细胞存活。EPO和PI 3-K/Akt途径通过抑制PRAS 40的翻译后磷酸化来控制细胞存活和mTOR活性,所述磷酸化导致PRAS 40与细胞质停靠蛋白14 - 3 - 3的亚细胞结合。然而,PRAS 40的调节和磷酸化不依赖于EPO的其他保护途径,所述其他保护途径涉及细胞外信号相关激酶(ERK 1/2)和信号转导和转录激活因子(STAT 5)。我们的研究强调了mTOR通路中的EPO和PRAS 40信号传导作为对抗导致细胞死亡的退行性疾病的潜在治疗策略。
Emerging strategies that center upon the mammalian target of rapamycin (mTOR) signaling for neurodegenerative disorders may bring effective treatment for a number of difficult disease entities. Here we show that erythropoietin (EPO), a novel agent for nervous system disorders, prevents apoptotic SH-SY5Y cell injury in an oxidative stress model of oxygen-glucose deprivation through phosphatidylinositol-3-kinase (PI 3-K)/protein kinase B (Akt) dependent activation of mTOR signaling and phosphorylation of the downstream pathways of p70 ribosomal S6 kinase (p70S6K), eukaryotic initiation factor 4E-binding protein 1 (4EBP1), and proline rich Akt substrate 40 kDa (PRAS40). PRAS40 is an important regulatory component either alone or in conjunction with EPO signal transduction that can determine cell survival through apoptotic caspase 3 activation. EPO and the PI 3-K/Akt pathways control cell survival and mTOR activity through the inhibitory post-translational phosphorylation of PRAS40 that leads to subcellular binding of PRAS40 to the cytoplasmic docking protein 14-3-3. However, modulation and phosphorylation of PRAS40 is independent of other protective pathways of EPO that involve extracellular signal related kinase (ERK 1/2) and signal transducer and activator of transcription (STAT5). Our studies highlight EPO and PRAS40 signaling in the mTOR pathway as potential therapeutic strategies for development against degenerative disorders that lead to cell demise.
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