中国组织工程研究 ›› 2023, Vol. 27 ›› Issue (24): 3773-3779.doi: 10.12307/2023.681

• 干细胞外泌体 Stem cell exosomes •    下一篇

上调长链非编码RNA SNHG12表达减轻过氧化氢诱导的神经细胞活性下降及细胞凋亡和过度自噬

郑羽晨,章  健,张  睿,陈晓生,蓝  涛,周文钰   

  1. 深圳大学第一附属医院(深圳市第二人民医院)脊柱科,广东省深圳市   518035
  • 收稿日期:2022-08-04 接受日期:2022-10-18 出版日期:2023-08-28 发布日期:2023-01-18
  • 通讯作者: 周文钰,硕士,主任医师,深圳大学第一附属医院(深圳市第二人民医院)脊柱科,广东省深圳市 518035
  • 作者简介:郑羽晨,男,1985年生,广东省博罗县人,汉族,2012年南方医科大学毕业,硕士,主治医师,主要从事脊柱退变方面的研究。
  • 基金资助:
    广东省基础与应用基础研究基金项目(2021A1515110311),项目负责人:章健

Up-regulation of long non-coding RNA SNHG12 expression attenuates hydrogen peroxidation-induced decline in neuronal cell activity, apoptosis and excessive autophagy

Zheng Yuchen, Zhang Jian, Zhang Rui, Chen Xiaosheng, Lan Tao, Zhou Wenyu   

  1. Department of Spine, The First Affiliated Hospital (Shenzhen Second People’s Hospital) of Shenzhen University, Shenzhen 518035, Guangdong Province, China
  • Received:2022-08-04 Accepted:2022-10-18 Online:2023-08-28 Published:2023-01-18
  • Contact: Zhou Wenyu, Master, Chief physician, Department of Spine, The First Affiliated Hospital (Shenzhen Second People’s Hospital) of Shenzhen University, Shenzhen 518035, Guangdong Province, China
  • About author:Zheng Yuchen, Master, Attending physician, Department of Spine, The First Affiliated Hospital (Shenzhen Second People’s Hospital) of Shenzhen University, Shenzhen 518035, Guangdong Province, China
  • Supported by:
    Guangdong Province Basic and Applied Basic Research Fund Project, No. 2021A1515110311 (to ZJ)

摘要:

文题释义:

自噬:是在应激下大量胞质降解和有效更新的主要途径之一,它可以降解受损的细胞器或病理蛋白,在维持细胞稳态方面起着重要作用。在中枢神经系统,神经元的维护需要低水平的基础自噬。脊髓损伤后,过度自噬可以增强凋亡性神经细胞死亡。
氧化损伤:是脊髓损伤加重的原因之一,主要由活性氧介导。正常生理条件下,机体的氧化-抗氧化能力保持相对的稳态。脊髓损伤后,较小的髓内血管和毛细血管容易受损,导致脊髓缺氧和能量供应不足,线粒体功能障碍造成活性氧产生过多,引发神经细胞的氧化损伤和后续凋亡。

背景:脊髓损伤后的继发性损伤被认为是其致残率高的主要因素。抑制氧化应激和细胞凋亡的病理级联反应,延缓疾病进程,是减轻脊髓损伤的一大治疗方向。长链非编码RNA SNHG12被认为与细胞的氧化还原稳态具有相关性,其能否调控过氧化氢过载引起的神经细胞氧化损伤目前仍未知。
目的:探究长链非编码RNA SNHG12在过氧化氢诱导神经细胞HT22氧化损伤中的作用及机制。
方法:①100 μmol/L过氧化氢干预HT22细胞6 h,建立细胞氧化损伤模型。②通过转染提升HT22细胞中SNHG12表达水平,采用CCK-8、锥虫蓝染色、TUNEL染色和蛋白质免疫印迹实验评估SNHG12表达水平对HT22细胞活力、凋亡和自噬的影响。③采用荧光素酶实验验证SNHG12/miR-320a/SIRT5的靶向关系。④通过转染分别促进HT22细胞中miR-320a和SIRT5上调,采用逆转实验探讨miR-320a和SIRT5在SNHG12发挥保护作用中的调控作用。

结果与结论:上调SHNG12表达可以减轻过氧化氢诱导的细胞活性下降、细胞凋亡和过度自噬。荧光素酶实验证实SHNG12/miR-320a/SIRT5三者之间存在结合关系。miR-320a过表达可以逆转上调SNHG12对以上各指标的影响,而SIRT5过表达可以逆转上调miR-320a对以上各指标的影响。结果表明:SNHG12通过调控miR-320a/SIRT5轴抑制HT22细胞自噬和凋亡,减缓细胞氧化损伤。

https://orcid.org/0000-0003-3905-2361 (郑羽晨) 

中国组织工程研究杂志出版内容重点:干细胞;骨髓干细胞;造血干细胞;脂肪干细胞;肿瘤干细胞;胚胎干细胞;脐带脐血干细胞;干细胞诱导;干细胞分化;组织工程

关键词: SNHG12, 神经细胞, 氧化损伤, miR-320a, SIRT5

Abstract: BACKGROUND: After spinal cord injury, secondary injury is considered to be a major factor in its high morbidity rate. Inhibiting the pathological cascade of oxidative stress and apoptosis and delaying the disease process are the primary therapeutic direction for alleviating spinal cord injury. The long non-coding RNA SNHG12 is thought to be related to cellular redox homeostasis, and its function on regulating the oxidative damage in neurons caused by H2O2 overload remains unknown.  
OBJECTIVE: To investigate the function and mechanism of long non-coding RNA SNHG12 in H2O2-induced oxidative damage of HT22 cells.
METHODS: (1) The HT22 cells were exposed to 100 μmol/L H2O2 for 6 hours to establish the cellular oxidative damage model. (2) The expression level of SNHG12 in HT22 cells was increased by transfection. The influences of SNHG12 expression on HT22 cell viability, apoptosis level, and autophagy were evaluated using CCK8 assay, Tryphenol blue staining, TUNEL staining, and western blot analysis. (3) Luciferase assay was used to verify the targeting relationship between SNHG12/miR-320a/SIRT5. (4) The upregulation of miR-320a and SIRT5 in HT22 cells was induced by transfection, respectively, and the regulation of miR-320a and SIRT5 in the protective role of SNHG12 was explored by reverse experiments.  
RESULTS AND CONCLUSION: SHNG12 overexpression could alleviate the decline in cell viability, apoptosis, and excessive autophagy caused by H2O2. Luciferase reporter assay confirmed the binding relationship among SHNG12/miR-320a/SIRT5. miR-320a overexpression could reverse the effects of elevated SNHG12 on the above aspects, whereas SIRT5 overexpression can reverse the effect of up-regulation of miR-320a on the above indicators. It is concluded that SNHG12 suppressed autophagy and apoptosis of HT22 cells and alleviated oxidative damage via regulating miR-320a /SIRT5 axis.

Key words: SNHG12, nerve cell, oxidative damage, miR-320a, SIRT5

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