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1.重庆医科大学生命科学研究院,重庆 400016
2.重庆医科大学附属儿童医院小儿肿瘤外科,重庆 400014
刘 灿,Email:1601297310@qq.com,研究方向:精神分裂症的机制研究。
修 芸,Email:xiuyun123@cqmu.edu.cn。
收稿:2024-01-06,
修回:2024-04-17,
录用:2024-04-24,
纸质出版:2024-09-28
移动端阅览
刘灿,张萌萌,曹佳宁,等.上调海马区GluN3A表达对小鼠行为学及髓鞘表达的影响[J].重庆医科大学学报,2024,49(9):1065-1071.
Liu Can,Zhang Mengmeng,Cao Jianing,et al.Effects of GluN3A overexpression in the bilateral hippocampus on mouse behaviors and myelination[J].Journal of Chongqing Medical University,2024,49(9):1065-1071.
刘灿,张萌萌,曹佳宁,等.上调海马区GluN3A表达对小鼠行为学及髓鞘表达的影响[J].重庆医科大学学报,2024,49(9):1065-1071. DOI: 10.13406/j.cnki.cyxb.003581.
Liu Can,Zhang Mengmeng,Cao Jianing,et al.Effects of GluN3A overexpression in the bilateral hippocampus on mouse behaviors and myelination[J].Journal of Chongqing Medical University,2024,49(9):1065-1071. DOI: 10.13406/j.cnki.cyxb.003581.
目的
2
探究海马区N-甲基-D-天冬氨酸受体(N-methyl-d-aspartate receptor,NMDAR)3A亚基(N-methyl-D-aspartate receptor subtype 3A,GluN3A)在焦虑、学习记忆和抑郁样行为中的作用及其可能的机制。
方法
2
选取7~8周龄雄性C57BL/6N小鼠30只,随机分成GluN3A基因过表达组(GluN3A overexpression,GluN3A OE组)和对照组,分别注射过表达GluN3A病毒和对照空病毒至双侧海马,注射3周后,进行旷场实验、Y迷宫、强迫游泳和悬尾实验行为学测试,随后以Western blot和qRT-PCR检测GluN3A、髓鞘碱性蛋白(myelin basic protein,MBP)、髓鞘相关糖蛋白(myelin associated glycoprotein,MAG)和少突胶质细胞转录因子2(oligodendrocyte Lineage Transcription factor 2,Olig2)的表达情况;以免疫荧光技术检测少突胶质细胞发育状况。
结果
2
旷场实验中,2组小鼠间总运动距离(
P
=0.256)、中心区域停留时间(
P
=0.487)差异均无统计学意义;Y迷宫实验中,GluN3A OE组小鼠进臂总次数低于对照组小鼠(
P
=0.015),但进臂交替率在2组小鼠间差异无统计学意义(
P
=0.381);强迫游泳实验(
P=
0.347)和悬尾实验(
P
=0.471)显示,不动时间在2组小鼠间差异均无统计学意义。双侧海马区域注射rAAV-GluN3A后,海马区GluN3A蛋白表达较对照组明显增加(
P
=0.005),海马区MBP蛋白(
P
=0.019)、MAG蛋白(
P
=0.022)和Olig2蛋白(
P
=0.022)表达降低,海马区MBP mRNA(
P
=0.043)、MAG mRNA(
P
=0.032)和Olig2 mRNA(
P
<
0.001)的表达与蛋白表达下降趋势相一致,均降低;免疫荧光染色显示:GluN3A OE组小鼠海马区结肠腺瘤样息肉标记成熟少突胶质细胞密度降低(
P
<
0.001),但血小板衍生生长因子受体标记少突胶质前体细胞密度无明显变化(
P
=0.542)。
结论
2
在双侧海马区域过表达GluN3A亚基基因并未引发小鼠出现学习记忆能力改变、焦虑行为及抑郁样行为,仅引发海马区域髓鞘相关蛋白低表达及成熟少突胶质细胞减少。
Objective
2
To explore the role and possible regulatory mechanism of hippocampal N-methyl-D-aspartate receptor subtype 3A(GluN3A) subunit in anxiety-related behaviors,ability of learning and memory,and depression-like behaviors.
Methods
2
Thirty male C57BL/6N mice aged 7-8 weeks were randomly divided into GluN3A overexpression group(GluN3A OE) and control group. Recombinant adeno-associated viruses with(rAAV-GluN3A) and without(rAAV-control) the gene encoding GluN3A were injected into the bilateral hippocampus of mice in the GluN3A OE and control groups,respectively. At 3 weeks after virus injection,behavioral assessments were conducted using the open field test,Y maze test,forced swimming test,and tail suspension test. Subsequently,Western blot and qRT-PCR were performed to determine the expression levels of GluN3A,myelin basic protein(MBP),myelin-associated glycoprotein(MAG),and oligodendrocyte transcription factor 2(Olig2). Moreover,immunofluorescence staining was carried out to evaluate the development of oligodendrocytes.
Results
2
In the open field test,there were no significant differences in the total moving distance(
P
=0.256) and the time spending in central area of open field(
P
=0.487) between the two groups. In the Y maze test,the total number of arm entries of mice was significantly lower in the GluN3A OE group than in the control group(
P
=0.015),while no significant difference was observed in alternating rate between the two groups(
P
=0.381). Both forced swimming test(
P=
0.347) and tail suspension test(
P
=0.471) showed no significant differences in immobility time between the two groups. After injection of rAAV-GluN3A in the bilateral hippocampus,the expression of GluN3A protein in the hippocampus was significantly increased compared to that of control group(
P
=0.005). The expression levels of MBP protein(
P
=0.019),MAG protein(
P
=0.022),and Olig2 protein(
P
=0.022) were significantly decreased in mice of the GluN3A OE group compared to mice of the control group. The expression levels of MBP mRNA(
P
=0.043),MAG mRNA(
P
=0.032),and Olig2 mRNA(
P
<
0.001) were significantly decreased in mice of the GluN3A OE group,which was consistent with the decreased expression of MBP,MAG,and Olig2 proteins. Immunofluorescence showed that the density of CC1
+
mature oligodendrocytes was significantly decreased in the hippocampus of mice in the GluN3A OE group(
P
<
0.001),while the density of PDGFRɑ
+
oligodendrocyte precursor cells displayed negligible variation(
P
=0.5
42).
Conclusion
2
Overexpression of GluN3A subunit gene in the bilateral hippocampus did not lead to changes in ability of learning and memory,anxious behaviors,and depression-like behaviors in mice,but led to the low expression of myelin-related proteins and decreased density of mature oligodendrocytes in the hippocampus.
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