High glucose and palmitic acid induces neuronal senescence by NRSF/REST elevation and the subsequent mTOR-related autophagy suppression.

High glucose and palmitic acid induces neuronal senescence by NRSF/REST elevation and the subsequent mTOR-related autophagy suppression.
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高葡萄糖和棕榈酸通过 NRSF/REST 升高和随后的 mTOR 相关自噬抑制诱导神经元衰老

DOI:
10.1186/s13041-022-00947-2
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发表时间:
2022-07-18
期刊:
影响因子:
3.6
通讯作者:
--
中科院分区:
医学3区
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--
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细胞衰老是一种基本的衰老机制。此前的研究发现,脂肪组织和其他组织(如胰腺、肌肉和肝脏)的细胞衰老与2型糖尿病的发病和进展有关。然而,糖尿病是否直接导致大脑神经元衰老仍缺乏有力的证据。在本研究中,我们在 PC12 神经元细胞和原代小鼠皮质神经元上构建了高葡萄糖和棕榈酸 (HGP) 环境来模拟糖尿病。我们的结果表明,HGP暴露后,神经元表现出明显的衰老样表型,包括NRSF/REST水平升高、mTOR激活和细胞自噬抑制。 NRSF/REST 的下调可以显着减轻 HGP 治疗诱导的 p16、p21 和 γH2A.X 上调,并增强神经元的 mTOR 自噬。我们的结果表明,糖尿病可直接诱导神经元衰老,这是由 NRSF/REST 上调和随后 mTOR 自噬减少介导的。在线版本包含可在 10.1186/s13041-022-00947-2 获取的补充材料。
Cell senescence is a basic aging mechanism. Previous studies have found that the cellular senescence in adipose tissue and other tissues, such as the pancreas, muscle and liver, is associated with the pathogenesis and progression of type 2 diabetes; however, strong evidence of whether diabetes directly causes neuronal senescence in the brain is still lacking. In this study, we constructed a high glucose and palmitic acid (HGP) environment on PC12 neuronal cells and primary mouse cortical neurons to simulate diabetes. Our results showed that after HGP exposure, neurons exhibited obvious senescence-like phenotypes, including increased NRSF/REST level, mTOR activation and cell autophagy suppression. Downregulation of NRSF/REST could remarkably alleviate p16, p21 and γH2A.X upregulations induced by HGP treatment, and enhance mTOR-autophagy of neurons. Our results suggested that the diabetic condition could directly induce neuronal senescence, which is mediated by the upregulation of NRSF/REST and subsequent reduction of mTOR-autophagy. The online version contains supplementary material available at 10.1186/s13041-022-00947-2.
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