中国组织工程研究 ›› 2025, Vol. 29 ›› Issue (2): 254-261.doi: 10.12307/2025.246

• 组织构建实验造模 experimental modeling in tissue construction • 上一篇    下一篇

IP3R2及RYR2介导Ca2+信号在急性一氧化碳中毒迟发性脑病小鼠模型中的表达

赵吉利1,孟天予1,岳雅蓉1,张  鑫1,杜文倩1,张鑫宇1,薛  慧2,项文平3   

  1. 1内蒙古科技大学包头医学院中心临床医学院,内蒙古自治区包头市  014040;2包头市中心医院神经内科,内蒙古自治区包头市  014040;3包头市蒙医中医医院,内蒙古自治区包头市  014040
  • 收稿日期:2024-01-19 接受日期:2024-04-22 出版日期:2025-01-18 发布日期:2024-05-24
  • 通讯作者: 薛慧,博士,副主任医师,包头市中心医院神经内科,内蒙古自治区包头市 014040 并列通讯作者:项文平,博士,副主任医师,包头市蒙医中医医院,内蒙古自治区包头市 014040
  • 作者简介:赵吉利,女,1997年生,内蒙古自治区鄂尔多斯市人,汉族,2024年内蒙古科技大学包头医学院毕业,硕士,医师,主要从事脑血管疾病、头痛、头晕及眩晕的研究。
  • 基金资助:
    中央引导地方科技发展资金(2021ZY0038),项目负责人:项文平

Expression of IP3R2 and RYR2 mediated Ca2+ signals in a mouse model of delayed encephalopathy after acute carbon monoxide poisoning 

Zhao Jili1, Meng Tianyu1, Yue Yarong1, Zhang Xin1, Du Wenqian1, Zhang Xinyu1, Xue Hui2, Xiang Wenping3   

  1. 1Clinical School of Medicine, Baotou Medical College, Inner Mongolia University of Science and Technology, Baotou 014040, Inner Mongolia Autonomous Region, China; 2Department of Neurology, Baotou Central Hospital, Baotou 014040, Inner Mongolia Autonomous Region, China; 3Baotou Mongolian Medicine Hospital, Baotou 014040, Inner Mongolia Autonomous Region, China
  • Received:2024-01-19 Accepted:2024-04-22 Online:2025-01-18 Published:2024-05-24
  • Contact: Xue Hui, MD, Associate chief physician, Department of Neurology, Baotou Central Hospital, Baotou 014040, Inner Mongolia Autonomous Region, China Co-corresponding author: Xiang Wenping, MD, Associate chief physician, Baotou Mongolian Medicine Hospital, Baotou 014040, Inner Mongolia Autonomous Region, China
  • About author:Zhao Jili, Master, Physician, Clinical School of Medicine, Baotou Medical College, Inner Mongolia University of Science and Technology, Baotou 014040, Inner Mongolia Autonomous Region, China
  • Supported by:
    The Central Government Guides Local Funds for Science and Technology Development Program, No. 2021ZY0038 (to XWP)

摘要:

文题释义:
急性一氧化碳中毒迟发性脑病:是指急性一氧化碳中毒患者经抢救急性中毒症状恢复后,经过数天或数周(2-60 d)的假愈期,再次发生以痴呆、精神症状、锥体系及锥体外系症状为主的神经系统疾病。一般发生在急性中毒的2个月内。
1,4,5-三磷酸肌醇受体(Inositol 1,4,5-trisphosphate receptors,IP3Rs):是位于内质网上的配体门控Ca2+通道,当细胞外信号分子激活细胞膜上的受体,受体与特定的G 蛋白偶联受体结合,引起磷脂酶C激活,水解磷脂酰肌醇-4,5-二磷酸生成肌醇三磷酸和甘油二酯,IP3 与在内质网膜上的IP3Rs 结合,促使内质网Ca2+库释放 Ca2+,引起细胞内Ca2+浓度瞬间增高,产生钙信号。目前已知IP3Rs有3种亚型,其中IP3R2在星形胶质细胞中表达丰富。

背景:研究发现星形胶质细胞中Ca2+的表达与认知功能密切相关,目前由1,4,5-三磷酸肌醇受体(Inositol 1,4,5-trisphosphate receptors,IP3Rs)2、兰尼碱受体(ryanodine receptors,RYRs)2受体及其调控的Ca2+信号通路已经成为认知障碍相关疾病研究的热点。
目的:研究急性一氧化碳中毒迟发性脑病动物模型中,海马组织内星形胶质细胞和IP3R2、RYR2介导的Ca2+信号的表达情况,探索急性一氧化碳中毒迟发性脑病可能的发病机制。
方法:Morris水迷宫实验筛选认知功能合格的C57BL小鼠随机分为对照组、实验组,实验组小鼠采用静态吸入一氧化碳建立急性一氧化碳中毒迟发性脑病模型,对照组小鼠吸入等量空气。造模后第21天,利用Morris水迷宫、苏木精-伊红染色、Western blot、免疫荧光双标法、Ca2+荧光探针检测中毒小鼠行为学及神经元改变、星形胶质细胞特异性标记物胶质纤维酸性蛋白及IP3R2、RYR2受体、星形胶质细胞内Ca2+ 浓度变化。
结果与结论:①Morris水迷宫实验发现与对照组相比,实验组小鼠逃避潜伏期明显延长(P < 0.05);②苏木精-伊红染色表明实验组小鼠海马锥体细胞数减少、细胞结构紊乱、细胞核碎裂伴溶解;③免疫荧光检测表明海马区 IP3R2、RYR2分别和胶质纤维酸性蛋白存在共表达,且实验组海马区 IP3R2、RYR2和胶质纤维酸性蛋白表达均上调(P < 0.05) ;④Western blot检测显示实验组海马区IP3R2、RYR2及胶质纤维酸性蛋白的蛋白表达均增多(P < 0.05) ;⑤Ca2+荧光探针法检测表明实验组小鼠海马区星形胶质细胞内 Ca2+ 浓度明显升高(P < 0.05);⑥结果说明,星形胶质细胞可能通过介导IP3R2、RYR2受体影响Ca2+信号,进而使一氧化碳中毒的小鼠认知功能受损,最终导致急性一氧化碳中毒迟发性脑病发生。
https://orcid.org/0009-0009-2208-6611(赵吉利);https://orcid.org/0000-0001-5618-2534(薛慧);
https://orcid.org/0000-0002-9952-0983(项文平)
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: 急性一氧化碳中毒迟发性脑病, 星形胶质细胞, IP3R2受体, RYR2受体, 钙信号, 认知功能

Abstract: BACKGROUND: Ca2+ expression in astrocytes has been found to be closely related to cognitive function, and the Ca2+ signaling pathway regulated by inositol 1,4,5-trisphosphate receptors (IP3R2) and ryanodine receptor (RYR) 2 receptors has become a hot spot in the study of cognitive disorder-related diseases.
OBJECTIVE: To investigate the expression of Ca2+ signals mediated by IP3R2 and RYR2 in hippocampal astrocytes in animal models of delayed encephalopathy after acute carbon monoxide poisoning, and to explore the possible pathogenesis of delayed encephalopathy after acute carbon monoxide poisoning.
METHODS: C57BL mice with qualified cognitive function were selected by Morris water maze experiment and randomly divided into control group and experimental group. An animal model of delayed encephalopathy after acute carbon monoxide poisoning was established by static carbon monoxide inhalation in the experimental group, and the same amount of air was inhaled in the control group. Behavioral and neuronal changes, astrocyte specific marker glial fibrillary acidic protein, IP3R2, RYR2 receptor and Ca2+ concentration in astrocytes of the two groups were detected using Morris water maze, hematoxylin-eosin staining, western blot, immunofluorescence double labeling and Ca2+ fluorescence probe at 21 days after modeling.
RESULTS AND CONCLUSION: In the Morris water maze, the escape latency of the experimental group was significantly longer than that of the control group (P < 0.05). Hematoxylin-eosin staining results showed that in the experimental group, the number of hippocampal pyramidal cells decreased, the cell structure was disordered, and the nucleus was broken and dissolved. Immunofluorescence results showed that IP3R2 and RYR2 were co-expressed with glial fibrillary acidic protein in the hippocampus, and the expressions of IP3R2, RYR2 and glial fibrillary acidic protein were up-regulated in the hippocampus of the experimental group (P < 0.05). Western blot analysis showed that the expressions of IP3R2, RYR2, and glial fibrillary acidic protein in the hippocampus of the experimental group were increased (P < 0.05). Ca2+ concentration in hippocampal astrocytes increased significantly in the experimental group (P < 0.05). To conclude, astrocytes may affect Ca2+ signals by mediating IP3R2 and RYR2 receptors, then impair the cognitive function of mice with carbon monoxide poisoning, and eventually lead to delayed encephalopathy after acute carbon monoxide poisoning.

Key words: delayed encephalopathy after acute carbon monoxide poisoning, astrocyte, IP3R2 receptor, RYR2 receptor, calcium signaling, cognitive function

中图分类号: