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1.成都中医药大学针灸推拿学院,成都610075
2.成都中医药大学基础医学院,成都610075
Received:31 July 2022,
Revised:28 September 2022,
Published:25 December 2023
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李虹莹,沈缘,谢璐霜等.艾灸通过白细胞介素-33/生长刺激表达基因2蛋白通路影响阿尔茨海默病小鼠海马小胶质细胞极化[J].针刺研究,2023,48(12):1202-1208.
LI Hong-ying,SHEN Yuan,XIE Lu-shuang,et al.Moxibustion influences hippocampal microglia polarization via IL-33/ST2 pathway in Alzheimer’s disease mice[J].Acupuncture Research,2023,48(12):1202-1208.
李虹莹,沈缘,谢璐霜等.艾灸通过白细胞介素-33/生长刺激表达基因2蛋白通路影响阿尔茨海默病小鼠海马小胶质细胞极化[J].针刺研究,2023,48(12):1202-1208. DOI: 10.13702/j.1000-0607.20220877.
LI Hong-ying,SHEN Yuan,XIE Lu-shuang,et al.Moxibustion influences hippocampal microglia polarization via IL-33/ST2 pathway in Alzheimer’s disease mice[J].Acupuncture Research,2023,48(12):1202-1208. DOI: 10.13702/j.1000-0607.20220877.
目的
2
观察艾灸通过白细胞介素-33(IL-33)/生长刺激表达基因2蛋白(ST2)信号通路对阿尔茨海默病(AD)小鼠小胶质细胞向M2方向极化的影响。
方法
2
5月龄APP/PS1雄性小鼠随机分为模型组和艾灸组,同月龄C57BL/6J小鼠为对照组,每组9只。艾灸组温和灸“百会”“涌泉”,每次30 min,每日1次,每周5 d,共4周。采用Morris水迷宫实验评估小鼠空间学习记忆能力,Western blot法检测小鼠海马组织IL-33和ST2蛋白表达量,免疫荧光染色法检测小鼠海马CA1区β-淀粉样蛋白(Aβ)、磷酸化Tau蛋白(p-Tau)阳性表达水平及IL-33/离子钙接头蛋白分子1(Iba-1)、ST2/Iba-1、精氨酸酶1(Arg1)/Iba-1和诱导型一氧化氮合酶(iNOS)/Iba-1的荧光双标共表达情况。
结果
2
与对照组比较,模型组小鼠各时点逃避潜伏期延长(
P
<
0.001,
P
<
0.01),进入有效区域次数和目标象限游泳时间百分比下降(
P
<
0.001),海马CA1区Aβ和p-Tau蛋白阳性表达水平升高(
P
<
0.001),海马组织IL-33和ST2蛋白表达降低(
P
<
0.05,
P
<
0.001),海马CA1区IL-33/Iba-1、ST2/Iba-1、Arg1/Iba-1蛋白共表达水平降低(
P
<
0.001),iNOS/Iba-1蛋白共表达水平升高(
P
<
0.001)。与模型组比较,艾灸组小鼠各时点逃避潜伏期缩短(
P
<
0.001,
P
<
0.01),进入有效区域次数和在目标象限游泳时间百分比升高(
P
<
0.001),海马CA1区Aβ和p-Tau蛋白阳性表达水平降低(
P
<
0.001),海马组织IL-33和ST2蛋白表达升高(
P
<
0.05,
P
<
0.01),海马CA1区IL-33/Iba-1、ST2/Iba-1、Arg1/Iba-1蛋白共表达水平升高(
P
<
0.001,
P
<
0.05,
P
<
0.01),iNOS/Iba-1蛋白共表达水平降低(
P
<
0.001)。
结论
2
艾灸可以改善APP/PS1小鼠的空间学习记忆能力,减少Aβ和p-Tau的病理沉积,可能与上调IL-33/ST2信号通路、促进小胶质细胞向M2方向极化有关。
Objective
2
To observe the effect of moxibustion on the polarization of microglia towards M2 direction in Alzheimer’s disease (AD) mice through the interleukin-33 (IL-33)/growth stimulating gene 2 protein (ST2) signaling pathway.
Methods
2
Five-month-old APP/PS1 male mice were randomly divided into model and moxibustion (Moxi) groups, and C57BL/6J mice of the same age were as the control group, with 9 mice in each group. In the Moxi group, moxibustion was applied at “Baihui” (GV20) and “Yongquan” (KI1) for 30 min, once a day, 5 days a week for 4 weeks. The spatial learning memory ability was observed by the Morris water maze test. The relative expressions of IL-33 and ST2 in hippocampus were detected by Western blot. The positive expression of amyloid-β (Aβ), phosphorylated Tau (p-Tau), IL-33/ionized calcium binding adapter molecule 1(Iba-1), ST2/Iba-1, arginase 1 (Arg1)/Iba-1 and indu-cible nitric oxide synthase (iNOS)/Iba-1 in hippocampal CA1 region were detected by immunofluorescence.
Results
2
Compared with the control group, the escape latency of the mice in the model group was prolonged (
P
<
0.001,
P
<
0.01), the number of times to enter the effective area and the percentage of target quadrant swimming time were reduced (
P
<
0.001), the positive expression of both Aβ and p-Tau, the positive expression of iNOS/Iba-1 in the hippocampal CA1 region was increased (
P
<
0.001), while the expression of IL-33 and ST2 protein in hippocampal tissue, the positive expression levels of IL-33/Iba-1, ST2/Iba-1 and Arg1/Iba-1 in hippocampal CA1 region were all decreased (
P
<
0.05,
P
<
0.001). After treatment, compared with the model group, the escape latency of the mice in the moxibustion group was shortened (
P
<
0.001,
P
<
0.01), the number of entries into the effective area and the percentage of target quadrant swimming time were increased (
P
<
0.001), the positive expression of Aβ and p-Tau in the hippocampal CA1 region, and the positive expression of iNOS/Iba-1 were decreased (
P
<
0.001), while the expression of IL-33 and ST2 protein in the hippocampal tissue, the positive expression of IL-33/Iba-1, ST2/Iba-1 and Arg1/Iba-1 in hippocampal CA1 region were all increased (
P
<
0.05,
P
<
0.01,
P
<
0.001).
Conclusion
2
Moxibustion can improve the spatial learning and memory abilities, reduce the pathological deposition of Aβ and p-Tau in APP/PS1 mice, which may be related to its function in up-regulating the IL-33/ST2 signaling pathway to regulate the polarization of microglia towards M2 direction.
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