首页> 外文期刊>The Journal of Neuroscience: The Official Journal of the Society for Neuroscience >Arginine Methyltransferase PRMT8 Provides Cellular Stress Tolerance in Aging Motoneurons
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Arginine Methyltransferase PRMT8 Provides Cellular Stress Tolerance in Aging Motoneurons

机译:精氨酸甲基转移酶PRMT8在衰老运动神经元中提供了细胞应激耐受性

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摘要

Aging contributes to cellular stress and neurodegeneration. Our understanding is limited regarding the tissue-restricted mechanisms providing protection in postmitotic cells throughout life. Here, we show that spinal cord motoneurons exhibit a high abundance of asymmetric dimethyl arginines (ADMAs) and the presence of this posttranslational modification provides protection against environmental stress. We identify protein arginine methyltransferase 8 (PRMT8) as a tissue-restricted enzyme responsible for proper ADMA level in postmitotic neurons. Male PRMT8 knock-out mice display decreased muscle strength with aging due to premature destabilization of neuromuscular junctions. Mechanistically, inhibition of methyltransferase activity or loss of PRMT8 results in accumulation of unrepaired DNA double-stranded breaks and decrease in the cAMP response-element-binding protein 1 (CREB1) level. As a consequence, the expression of CREB1-mediated prosurvival and regeneration-associated immediate early genes is dysregulated in aging PRMT8 knock-out mice. The uncovered role of PRMT8 represents a novel mechanism of stress tolerance in long-lived postmitotic neurons and identifies PRMT8 as a tissue-specific therapeutic target in the prevention of motoneuron degeneration.
机译:老化有助于细胞应激和神经变性。我们的理解是有限的,关于组织限制机制在整个寿命期间提供了在后暗细胞中的保护。在此表明,脊髓运动神经元表现出高丰度不对称二甲基精氨酸(ADMA),并且这种后期改性的存在提供了免受环境压力的保护。我们将蛋白质精氨酸甲基转移酶8(PRMT8)鉴定为负责在后暗神经元的适当ADMA水平的组织限制酶。雄性PRMT8敲除小鼠显示随着神经肌肉交叉点的过早稳定化而导致肌肉强度降低。机械地,抑制甲基转移酶活性或PRMT8的损失导致未分配的DNA双链累积的积累,并降低营地反应 - 元素结合蛋白1(CREB1)水平。结果,在衰老的PRMT8敲除小鼠中,CREB1介导的刺激和再生相关立即早期基因的表达在衰老中进行了多重测定。 PRMT8的未覆盖作用代表了长期的后蛋白神经元中应力耐受性的新机制,并将PRMT8鉴定为预防运动神经元变性的组织特异性治疗靶标。

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