中山大学中山医学院解剖学教研室,广东 广州510080
王清波,硕士生,研究方向:阿尔茨海默病的神经免疫学机制,E-mail:wangqb7@mail2.sysu.edu.cn
收稿:2022-03-10,
纸质出版:2022-05-20
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王清波,唐姣玲,郭开华等.Arginase1敲低通过增强Aβ降解和减轻神经炎症改善APP/PS1小鼠认知功能[J].中山大学学报(医学科学版),2022,43(03):352-360.
WANG Qing-bo,TANG Jiao-ling,GUO Kai-hua,et al.Arginase1 Knockdown Improves Cognitive Function by Enhancing Aβ Degradation and Reducing Neuroinflammation in APP/PS1 Mouse[J].Journal of Sun Yat-sen University(Medical Sciences),2022,43(03):352-360.
王清波,唐姣玲,郭开华等.Arginase1敲低通过增强Aβ降解和减轻神经炎症改善APP/PS1小鼠认知功能[J].中山大学学报(医学科学版),2022,43(03):352-360. DOI: 10.13471/j.cnki.j.sun.yat-sen.univ(med.sci).2022.0303.
WANG Qing-bo,TANG Jiao-ling,GUO Kai-hua,et al.Arginase1 Knockdown Improves Cognitive Function by Enhancing Aβ Degradation and Reducing Neuroinflammation in APP/PS1 Mouse[J].Journal of Sun Yat-sen University(Medical Sciences),2022,43(03):352-360. DOI: 10.13471/j.cnki.j.sun.yat-sen.univ(med.sci).2022.0303.
目的
2
探讨表达M2型小胶质细胞标志物精氨酸酶1(Arginase1,Arg1)敲低对阿尔茨海默病模型小鼠(APP/PS1)认知功能的影响。
方法
2
采用Arginase1基因工程小鼠,分为C57BL/6对照组(WT)、Arginase1低表达组(Arg1
+/-
)、阿尔茨海默病小鼠模型组(APP/PS1)、Arginase1、APP/PS1转基因小鼠Arginase1低表达组(Arg1
+/-
;APP/PS1),旷场实验(OFT)、Morris水迷宫(MWM)实验分别测试小鼠自主活动和适应能力、学习记忆能力,硫磺素S染色法和免疫荧光染色法检测小鼠脑内β-淀粉样蛋白(Aβ)沉积;小鼠海马区域Arginase1,小胶质细胞特征性标志物离子钙接头蛋白分子1(Iba1)、跨膜蛋白119(Tmem119)及溶酶体蛋白(CD68)表达量;ELISA法检测海马和皮质组织Aβ
1-40
、Aβ
1-42
表达量,蛋白免疫印迹(Western blot)法检测淀粉样蛋白前体蛋白 (APP)、APP-β位点剪切酶(BACE)、脑啡肽酶(NEP)、白细胞介素-1β(IL-1β)表达量。
结果
2
OFT结果显示,与APP/PS1组比较Arg1
+/-
;APP/PS1组在中央格区域的持续时间和运动频率明显增高(
P
<
0.001);MWM实验结果显示,与APP/PS1组比较Arg1
+/-
;APP/PS1组小鼠逃避潜伏期明显减少(
P
<
0.001)、目标象限停留时间和距离及穿越平台次数均明显增多(均
P
<
0.05);硫磺素S和免疫荧光染色法测定,与APP/PS1组比较Arg1
+/-
;APP/PS1组海马区域Aβ水平显著降低(
P
<
0.001),与APP/PS1组比较Arg1
+/-
;APP/PS1组海马区域小胶质细胞表达CD68增多(
P
=0.039 2,
P
=0.000 3);ELISA与Western blot结果显示,与APP/PS1组比较,Arg1
+/-
;APP/PS1组Aβ
1-40
、Aβ
1-42
、APP、IL-1β水平下降,NEP蛋白表达量增加(
P
<
0.000 1),BACE蛋白表达量无明显差异(
P
=0.497 7)。
结论
2
在APP/PS1模型小鼠中,下调Arginase1可能促进脑内小胶质细胞激活,上调Aβ降解酶NEP水平,减少脑内Aβ沉积和神经炎症,从而提高AD模型小鼠空间学习能力。
Objective
2
To investigate the effect of the M2 microglia marker Arginase1 (Arg1) knockdown on cognitive function in APP/PS1 transgenic mouse model of Alzheimer's disease (AD).
Methods
2
Arginase1 genetically engineered mice were used and divided into C57BL/6 control group (WT), Arginase1 low expression group (Arg1
+/-
), Alzheimer's disease mouse model group (APP/PS1), Arginase1, APP/PS1 transgenic mice Arginase1 low expression group (Arg1
+/-
; APP/PS1). We used open field test (OFT) to assess the autonomous activity and adaptive capacity of mice; morris water maze experiment (MWM) to evaluate learning and memory function of mice; thioflavine-S staining to observe the brain amyloid β-protein (Aβ) deposition in mice; immunofluorescence staining to detect the expression of microglia markers ionized calcium-binding adaptor molecule 1 (Iba1), transmembrane protein 119 (Tmem119) and lysosomal protein (CD68); Elisa to determine Aβ
1-40
and Aβ
1-42
expression in hippocampal and cortical tissues; and protein immunoblot (Western blot) to measure the expression of amyloid precursor protein (APP), beta-site APP-cleaving enzyme (BACE), enkephalinase (NEP), and interleukin-1β (IL-1β).
Results
2
Compared with APP/PS1 group, Arg1
+/-
; APP/PS1 group showed significantly increased duration and frequency in central area (
P
<
0.00 1); significantly reduced escape latency (
P
<
0.001), significantly increased dwell time, path length in the target quadrant and times of crossing the platform (all
P
<
0.05); significant decrease of Aβ deposition in the hippocampus (
P
<
0.000 1) and significant increased expression of CD68 by microglia in the hippocampal region (
P
=0.039 2,
P
=0.000 3); decreased levels of Aβ
1-40
, Aβ
1-42
, APP, IL-1β and increased expression of NEP protein (
P
<
0.000 1). No significant difference in BACE protein expression (
P
=0.497 7) was found.
Conclusion
2
Down-regulation of Arg1 may promote microglia activation in the brain, up-regulate the level of Aβ-degrading enzyme NEP, reduce Aβ deposition and neuroinflammation in the brain, thus improve the spatial learning capacity of APP/PS1 mouse model of AD.
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