中国组织工程研究 ›› 2021, Vol. 25 ›› Issue (2): 269-273.doi: 10.3969/j.issn.2095-4344.2980

• 组织构建细胞学实验 cytology experiments in tissue construction • 上一篇    下一篇

同型半胱氨酸致足细胞凋亡中FoxO1 DNA甲基化水平增高

刘  昆1,2,3,谢  琳2,3,4,曹  军1,2,3,丁  宁2,3,4,徐灵博2,3,4,马胜超2,3,4,李桂忠2,3,4,
姜怡邓2,3,4,卢冠军2,3,5
  

  1. 宁夏医科大学,1临床医学院,4基础医学院,宁夏回族自治区银川市   750004;2国家卫生健康委代谢性心血管疾病研究重点实验室,宁夏回族自治区银川市   750004;3宁夏血管损伤与修复研究重点实验室,宁夏回族自治区银川市   750004;5宁夏医科大学总医院,宁夏回族自治区银川市   750004
  • 收稿日期:2019-12-23 修回日期:2019-12-28 接受日期:2020-02-26 出版日期:2021-01-18 发布日期:2020-11-21
  • 通讯作者: 卢冠军,硕士,主任医师,宁夏医科大学总医院,宁夏回族自治区银川市 750004;国家卫生健康委代谢性心血管疾病研究重点实验室,宁夏回族自治区银川市 750004;宁夏血管损伤与修复研究重点实验室,宁夏回族自治区银川市 750004
  • 作者简介:刘昆,男,1992年生,安徽省太和县人,汉族,宁夏医科大学在读硕士,主要从事肾脏损伤中同型半胱氨酸对肾小球的影响研究。
  • 基金资助:
    国家自然科学基金(81560120)

Increased FoxO1 DNA methylation level in homocysteine-induced podocyte apoptosis

Liu Kun1, 2, 3, Xie Lin2, 3, 4, Cao Jun1, 2, 3, Ding Ning2, 3, 4, Xu Lingbo2, 3, 4, Ma Shengchao2, 3, 4, Li Guizhong2, 3, 4 , Jiang Yideng2, 3, 4, Lu Guanjun2, 3, 5   

  1. 1Clinical Medical College, 4Basic Medical College, 3Ningxia Medical University, Yinchuan 750004, Ningxia Hui Autonomous Region, China; 2Key Laboratory of Metabolic Cardiovascular Disease Research of National Health Commission, Yinchuan 750004, Ningxia Hui Autonomous Region, China; 3Ningxia Key Laboratory of Vascular Injury and Repair Research, Yinchuan 750004, Ningxia Hui Autonomous Region, China; 5General Hospital of Ningxia Medical University, Yinchuan 750004, Ningxia Hui Autonomous Region, China
  • Received:2019-12-23 Revised:2019-12-28 Accepted:2020-02-26 Online:2021-01-18 Published:2020-11-21
  • Contact: Lu Guanjun, Master, Chief physician, Key Laboratory of Metabolic Cardiovascular Disease Research of National Health Commission, Yinchuan 750004, Ningxia Hui Autonomous Region, China; Ningxia Key Laboratory of Vascular Injury and Repair Research, Yinchuan 750004, Ningxia Hui Autonomous Region, China; General Hospital of Ningxia Medical University, Yinchuan 750004, Ningxia Hui Autonomous Region, China
  • About author:Liu Kun, Master candidate, Clinical Medical College, Ningxia Medical University, Yinchuan 750004, Ningxia Hui Autonomous Region, China; Key Laboratory of Metabolic Cardiovascular Disease Research of National Health Commission, Yinchuan 750004, Ningxia Hui Autonomous Region, China; Ningxia Key Laboratory of Vascular Injury and Repair Research, Yinchuan 750004, Ningxia Hui Autonomous Region, China
  • Supported by:
    the National Natural Science Foundation of China, No. 81560120

摘要:

文题释义:
足细胞:是附着于肾小球基底膜外侧一种终末分化细胞,与血管内皮细胞和肾小球基底膜共同构成肾小球滤过膜。研究发现,足细胞由细胞器、主突和足突组成,其中足突与基底膜相连形成肾小球滤过的最后屏障;足细胞还参与肾小球基底膜的基质合成和维持其正常的结构功能;因此,足细胞对于维持肾小球滤过功能的完整性有着重要的作用。
同型半胱氨酸:是蛋氨酸在氨基酸循环代谢过程中产生的中间产物,研究表明同型半胱氨酸具有广泛的生物学效应,包括加速动脉粥样硬化、损害损伤后内皮修复和功能、调节脂质代谢和诱导血栓形成;同型半胱氨酸已经被认为是心血管疾病的独立因素,而且与肾损伤有密切联系,研究旨在阐明同型半胱氨酸在肾损伤中的具体作用机制。

背景:同型半胱氨酸增多会引起肾损伤并导致足细胞凋亡,但是其具体机制还尚不清楚。
目的:探讨叉头框转录因子O1 (forkhead box O,FoxO1)及其DNA甲基化在同型半胱氨酸致足细胞凋亡中的作用。
方法:体外培养小鼠肾脏足细胞(MPC-5),将其分为对照组(0 μmol/L同型半胱氨酸)和同型半胱氨酸组(80 μmol/L 同型半胱氨酸)。干预细胞48 h后,采用免疫荧光技术检验足细胞凋亡相关蛋白Bax、caspase12和Bcl-2的表达情况;采用实时荧光定量PCR(qRT-PCR)检测FoxO1 mRNA水平;采用Western blot检测FoxO1和DNMT1蛋白表达水平;采用巢式降落式特异性PCR(nMS-PCR)测验FoxO1 的DNA甲基化水平。
结果与结论:①与对照组相比,同型半胱氨酸组足细胞中Bax和caspase12表达明显增高,Bcl-2表达明显降低;②FoxO1的mRNA和蛋白表达水平明显降低(P < 0.01);③与对照组相比,同型半胱氨酸组FoxO1 DNA甲基化水平明显升高(P < 0.01),同型半胱氨酸组足细胞中DNMT1蛋白表达明显增高(P < 0.01);④结果表明:FoxO1 DNA高甲基化在同型半胱氨酸致足细胞凋亡中作用显著,而DNMT1参与同型半胱氨酸诱导的足细胞凋亡过程。
https://orcid.org/0000-0002-0938-1378(刘昆) 

中国组织工程研究杂志出版内容重点:组织构建;骨细胞;软骨细胞;细胞培养;成纤维细胞;血管内皮细胞;骨质疏松;组织工程

关键词: 肾, 肾小球, 肾损伤, 同型半胱氨酸, 足细胞, 凋亡, 因子, 甲基化

Abstract: BACKGROUND: The increase of homocysteine can lead to renal injury and podocyte apoptosis, but the specific mechanism is not clear. 
OBJECTIVE: To investigate the effect of Forkhead box O1 (FoxO1) and its DNA methylation in podocyte apoptosis induced by homocysteine. 
METHODS: Mouse renal podocytes (MPC-5) were cultured in vitro and divided into control group (0 μmol/L homocysteine) and homocysteine group (80 μmol/L homocysteine). After 48 hours of intervention, the expression of podocyte apoptosis-related proteins Bax, caspase12 and Bcl-2 was detected by immunofluorescence technique; the expression level of FoxO1 mRNA was detected by real-time fluorescence quantitative PCR; the protein expression levels of FoxO1 and DNMT1 were detected by western blot; DNA methylation level of FoxO1 was detected by nested methylation-specific PCR.
RESULTS AND CONCLUSION: Compared with the control group, the expression levels of Bax and caspase12 protein in podocytes of the homocysteine group were significantly increased, while the expression of Bcl-2 protein was significantly decreased. The expression levels of FoxO1 mRNA and protein were significantly decreased in the homocysteine group compared with the control group (P < 0.01). At the same time, the methylation level of FoxO1 DNA in the homocysteine group was significantly higher than that in the control group (P < 0.01), and the expression of DNMT1 protein in podocytes in the homocysteine group was significantly higher than that in the control group (P < 0.01). To conclude, FoxO1 DNA hypermethylation plays a significant role in podocyte apoptosis induced by homocysteine, whereas DNMT1 participates in homocysteine-induced podocyte apoptosis. 

Key words: kidney, glomerulus, renal injury, homocysteine, podocyte, apoptosis, factor, methylation

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