天津医药 ›› 2023, Vol. 51 ›› Issue (11): 1187-1192.doi: 10.11958/20230110

• 实验研究 • 上一篇    下一篇

MiR-139-5p靶向RIPK1/RIPK3/MLKL信号通路对慢性脑低灌注大鼠认知障碍的影响

史文倩(), 赵美英, 黄捷, 贺桂, 汪桂青()   

  1. 郑州大学附属郑州中心医院老年医学科(邮编450000)
  • 收稿日期:2023-02-01 修回日期:2023-03-29 出版日期:2023-11-15 发布日期:2023-11-07
  • 通讯作者: E-mail:b0517012200@126.com
  • 作者简介:史文倩(1987),女,主治医师,主要从事认知障碍方面研究。E-mail:wenqianwork@163.com
  • 基金资助:
    河南省医学科技攻关计划联合共建项目(LHGJ20210767)

Influence of miR-139-5p on cognitive dysfunction in rats with chronic cerebral hypoperfusion by targeting RIPK1/RIPK3/MLKL signal pathway

SHI Wenqian(), ZHAO Meiying, HUANG Jie, HE Gui, WANG Guiqing()   

  1. Department of Geriatrics, Zhengzhou Central Hospital Affiliated to Zhengzhou University, Zhengzhou 450000, China
  • Received:2023-02-01 Revised:2023-03-29 Published:2023-11-15 Online:2023-11-07
  • Contact: E-mail:b0517012200@126.com

摘要:

目的 探究微小RNA(miR)-139-5p靶向受体相互作用蛋白激酶(RIPK)1/RIPK3/混合系列蛋白激酶结构域蛋白(MLKL)信号通路对慢性脑低灌注(CCH)大鼠认知障碍的影响。方法 将60只SPF级SD大鼠采用随机数字表法分为假手术组(Sham组)、模型组(Model组)、miR-NC组、miR-139-5p mimic组、miR-139-5p mimic+RIPK1抑制剂Nec-1组(miR-139-5p mimic+Nec-1组),每组12只。除Sham组外,其余组均采用永久性结扎双侧颈总动脉构建CCH模型。采用新物体识别实验、Morris水迷宫实验评价大鼠的认知功能;酶联免疫吸附试验(ELISA)检测大鼠海马组织谷胱甘肽过氧化物酶(GSH-Px)、超氧化物歧化酶(SOD)、丙二醛(MDA)、肿瘤坏死因子(TNF)-α、白细胞介素6(IL-6)水平。实时荧光定量PCR(qPCR)法检测大鼠海马组织miR-139-5p及RIPK1、RIPK3、MLKL mRNA表达。Western blot法检测大鼠海马组织RIPK1、RIPK3、MLKL、突触素(SYP)、突触后密度蛋白95(PSD95)、α-突触核蛋白(α-SYN)蛋白的表达。双萤光素酶报告基因实验验证miR-139-5p和RIPK1的靶向关系。结果 与Sham组相比,Model组大鼠分辨系数降低,目标象限停留时间缩短,海马组织miR-139-5p、GSH-Px、SOD水平降低,SYP、PSD95蛋白表达降低(P<0.05),逃避潜伏期延长,海马组织MDA、TNF-α、IL-6水平升高,RIPK1、RIPK3、MLKL mRNA和蛋白、α-SYN蛋白表达升高(P<0.05)。与Model组、miR-NC组相比,miR-139-5p mimic组相关指标的表达趋势与上述相反(P<0.05)。Nec-1进一步促进了上调miR-139-5p表达对CCH大鼠认知功能的恢复(P<0.05)。miR-139-5p和RIPK1存在结合位点。结论 上调miR-139-5p可能通过靶向抑制RIPK1/RIPK3/MLKL信号通路减轻CCH大鼠的认知障碍。

关键词: 认知障碍, RIPK1/RIPK3/MLKL信号通路, 微小RNA-139-5p, 慢性脑低灌注

Abstract:

Objective To investigate the influence of miR-139-5p on cognitive dysfunction in chronic cerebral hypoperfusion (CCH) rats by targeting receptor-interacting protein kinase-1 (RIPK1)/receptor-interacting protein kinase-3 (RIPK3)/mixed lineage kinase domain-like protein (MLKL) signal pathway. Methods Sixty SPF SD rats were randomly divided into the sham operation group, the model group, the miR-NC group, the miR-139-5p mimic group and the miR-139-5p mimic+RIPK1 inhibitor Nec-1 group (miR-139-5p mimic+Nec-1 group), with 12 rats in each group. Except the sham group, the other groups used permanent ligation of bilateral common carotid arteries to construct rat CCH model. New object recognition experiment and Morris water maze were used to evaluate the cognitive function of rats. Enzyme linked immunosorbent assay (ELISA) was used to detect levels of glutathione peroxidase (GSH-Px), superoxide dismutase (SOD), malondialdehyde (MDA), inflammatory factor tumor necrosis factor (TNF)-α and interleukin-6 (IL-6) in rat hippocampus. Real-time quantitative PCR (qPCR) was used to detect the expression of miR-139-5p, RIPK1, RIPK3, MLKL mRNA in rat hippocampus. Western blot method was used to detect the protein expression levels of RIPK1, RIPK3, MLKL, synaptophysin (SYP), postsynaptic density protein 95 (PSD95) and α-synuclein (α-SYN). Double luciferase reporter gene experiment was used to verify the relationship between miR-139-5p and RIPK1. Results Compared with the sham group, the resolution coefficient, target quadrant residence time, levels of miR-139-5p, GSH-Px, SOD and the protein expression levels of SYP and PSD95 decreased obviously in hippocampus of the model group rats (P<0.05). The escape latency extended, and levels of MDA, TNF-α and IL-6 in hippocampus increased. The mRNA and protein expression of RIPK1, RIPK2, MLKL, the protein expression of α-SYN increased obviously (P<0.05). Compared with the model group and the miR-NC group, the expression trends of related indexes were opposite to the above in the miR-139-5p mimic group (P<0.05). Nec-1 further promoted the recovery of cognitive function in CCH rats by up-regulating the expression of miR-139-5p (P<0.05). MiR-139-5p negatively regulated the expression of RIPK1. Conclusion The up regulation of miR-139-5p may alleviate the cognitive dysfunction of CCH rats by targeting the inhibition of RIPK1/RIPK3/MLKL signaling pathway.

Key words: cognitive dysfunction, RIPK1/RIPK3/MLKL pathway, MicroRNA-139-5p, chronic cerebral hypoperfusion

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