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400016 重庆,重庆医科大学基础医学院组织学与胚胎学教研室
[张蕾,E-mail: 85991440@163.comZHANG Lei, E-mail: 85991440@163.com
[唐勇,E-mail: ytang062@163.comTANG Yong, E-mail: ytang062@163.com
收稿:2023-06-26,
修回:2023-08-04,
纸质出版:2024-01-30
移动端阅览
王舜, 蒋林, 何琦, 等. 过表达海马LINGO-1对小鼠学习和记忆能力及海马各亚区Spinophilin+树突棘的影响[J]. 陆军军医大学学报, 2024,46(2):118-127.
Shun WANG, Lin JIANG, Qi HE, et al. Effects of hippocampal overexpression of LINGO-1 on learning and memory abilities and Spinophilin+ dendritic spines in different hippocampal subregions of mice[J]. Journal of Army Medical University, 2024, 46(2): 118-127.
王舜, 蒋林, 何琦, 等. 过表达海马LINGO-1对小鼠学习和记忆能力及海马各亚区Spinophilin+树突棘的影响[J]. 陆军军医大学学报, 2024,46(2):118-127. DOI: 10.16016/j.2097-0927.202306100.
Shun WANG, Lin JIANG, Qi HE, et al. Effects of hippocampal overexpression of LINGO-1 on learning and memory abilities and Spinophilin+ dendritic spines in different hippocampal subregions of mice[J]. Journal of Army Medical University, 2024, 46(2): 118-127. DOI: 10.16016/j.2097-0927.202306100.
目的
2
脑立体定位注射腺相关病毒特异性过表达海马LINGO-1,探讨其对小鼠空间学习和记忆能力以及海马各亚区体积和Spinophilin
+
树突棘的影响。
方法
2
将7月龄雄性C57小鼠按照简单随机法分为对照组和LINGO-1过表达组,对照组小鼠海马立体定位注射携带绿色荧光的空载腺相关病毒(adeno-associated virus,AAV),LINGO-1过表达组小鼠海马立体定位注射同时携带绿色荧光和LINGO-1过表达载体的AAV。运用Morris水迷宫评估小鼠的空间学习和记忆能力,荧光定量PCR及免疫荧光染色方法分别检测小鼠海马内LINGO-1基因表达水平和各亚区荧光强度,体视学三维定量小鼠海马各亚区体积及Spinophilin
+
树突棘总数。
结果
2
对照组和LINGO-1过表达组病毒注射前后体质量差异无统计学意义;LINGO-1过表达诱导小鼠海马LINGO-1的mRNA水平升高、荧光强度增强(
P
<
0.01);与对照组相比,LINGO-1过表达组
小鼠在Morris水迷宫实验中的表现明显更差(
P
<
0.05);LINGO-1过表达诱导小鼠海马各亚区体积显著下降(
P
<
0.05
P
<
0.01),Spinophilin
+
树突棘密度显著降低(
P
<
0.01
P
<
0.05),Spinophilin
+
树突棘数量显著减少(
P
<
0.05)。
结论
2
海马立体定位注射过表达LINGO-1腺相关病毒能够特异性上调小鼠海马内LINGO-1水平,海马LINGO-1的异常高表达可导致小鼠海马体积减小及Spinophilin
+
树突棘突触丢失,并在一定程度上损伤其空间学习与记忆能力。
Objective
2
To investigate the effects of adenovirus-associated virus (AAV)-mediated overexpression of LINGO-1 in the hippocampus on spatial learning and memory abilities
as well as the volume and Spinophilin
+
dendritic spines of different subregions within the hippocampus in mice.
Methods
2
Male C57 mice at 7 months of age were randomly divided into a control group and a LINGO-1 overexpression group. The control group received hippocampal stereotaxic injection of AAV carrying green fluorescent protein (GFP)
while the LINGO-1 overexpression group received hippocampal stereotaxic injection of AAV carrying both GFP and LINGO-1 overexpression vector. Morris water maze was used to evaluate spatial learning and memory abilities of the mice. Quantitative PCR and immunofluorescence staining were used to detect LINGO-1 mRNA expression and fluorescence intensity in the hippocampus
and 3-dimensional stereology was used to quantify the volume and the total number of Spinophilin
+
dendritic spines.
Results
2
There was no significant difference in body weight between the control group and the LINGO-1 overexpression group before and after virus injection. LINGO-1 overexpression induced an increase in hippocampal LINGO-1 at mRNA level and in fluorescent intensity(
P
<
0.01). The LINGO-1 overexpression group performed significantly worse in the Morris water maze test compared t
o the control group(
P
<
0.05). Moreover
LINGO-1 overexpression led to a significant reduction in the volumes of different hippocampal subregions(
P
<
0.05
P
<
0.01)
accompanied by marked decreases in the density(
P
<
0.01
P
<
0.05) and total number of Spinophilin
+
dendritic spines(
P
<
0.05).
Conclusion
2
Stereotaxic injection of AAV-mediated LINGO-1 overexpression specifically upregulates LINGO-1 in the hippocampus of mice. Abnormally high expression of LINGO-1 in the hippocampus leads to decreased hippocampal volume and loss of Spinophilin
+
dendritic spines
as well as impaires spatial learning and memory abilities of mice to a certain extent.
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