Critical Role of Increased PTEN Nuclear Translocation in Excitotoxic and Ischemic Neuronal Injuries

Critical Role of Increased PTEN Nuclear Translocation in Excitotoxic and Ischemic Neuronal Injuries
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PTEN 核易位增加在兴奋性毒性和缺血性神经元损伤中的关键作用

DOI:
10.1523/jneurosci.5661-12.2013
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发表时间:
2013-05
影响因子:
5.3
通讯作者:
Wang, Yu Tian
Wang, Yu Tian
中科院分区:
医学1区
文献类型:
--
作者:
Lin, Shinn-Zong;Lee, Wei;Shyu, Woei-cherng;Wang, Yu Tian

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中风是发达国家致残的主要原因。然而,在发病后3小时后就没有治疗方法了。在这里,我们报道PTEN(在TEN染色体上缺失的磷酸酶和紧张素同源物)的核易位是一个延迟的步骤,导致兴奋性毒性(体外)和缺血性(体内)神经元损伤。我们发现n -甲基-d-天冬氨酸(NMDA)的兴奋毒性刺激导致培养神经元中PTEN核易位,这一过程需要赖氨酸13残基(K13)的单泛素化,因为K13或K13残基两侧的短干扰肽(Tat-K13)突变可以阻止易位。更重要的是,通过大鼠局灶性缺血模型,我们证明,即使在中风后6小时,系统应用Tat-K13,不仅可以减少缺血诱导的PTEN核易位,而且可以强烈保护缺血性脑损伤。我们的研究表明,抑制PTEN核易位可能是中风后治疗的一种新方法。
Stroke is the leading cause of disability in developed countries. However, no treatment is available beyond 3 h post-ictus. Here, we report that nuclear translocation of PTEN (phosphatase and tensin homolog deleted on chromosome TEN) is a delayed step causatively leading to excitotoxic (in vitro) and ischemic (in vivo) neuronal injuries. We found that excitotoxic stimulation of N-methyl-d-aspartate (NMDA) resulted in PTEN nuclear translocation in cultured neurons, a process requiring mono-ubiquitination at the lysine 13 residue (K13), as the translocation was prevented by mutation of K13 or a short interfering peptide (Tat-K13) that flanks the K13 residue. More importantly, using a rat model of focal ischemia, we demonstrated that systemic application of Tat-K13, even 6 h after stroke, not only reduced ischemia-induced PTEN nuclear translocation, but also strongly protected against ischemic brain damage. Our study suggests that inhibition of PTEN nuclear translocation may represent a novel after stroke therapy.
DOI: 10.1126/science.285.5433.1569
发表时间: 1999-09-03
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