β片层阻断肽H102对AD小鼠识别记忆能力和脑内AMPK-mTOR自噬相关通路的影响

doi:10.12047/j.cjap.5749.2019.001

摘要/Abstract

摘要： 目的:研究β片层阻断肽H102 对APP/PS1双转基因AD小鼠脑内AMPK-mTOR自噬通路相关蛋白表达的影响。方法:将30只六月龄的APP/PS1双转基因雄性AD小鼠随机分为AD组和H102干预组,将同月龄同背景的C57BL/6J雄性小鼠设为对照组(n=15)。在SPF级饲养给药,H102干预组的小鼠每天同一时间段经鼻腔给H102多肽溶液5 μl(5.8 mg/kg),对照组和AD组小鼠每日给予等量的空白辅料溶液。持续给药30 d后通过新物体识别实验来测试各组小鼠的记忆识别能力。用免疫组化和Western blot技术来检测磷酸化的腺苷酸活化蛋白激酶(P-AMPK)、磷酸化的哺乳动物雷帕霉素靶蛋白(P-mTOR)、微管相关蛋白轻链3Ⅱ与微管相关蛋白轻链3Ⅰ的比值(LC3Ⅱ/Ⅰ)在小鼠脑组织中的表达。结果:与对照组相比,AD 组小鼠的新物体识别指数(RI)显著降低(P＜0.05),小鼠脑内P-AMPK、LC3Ⅱ/Ⅰ比值显著降低(P＜0.05),P-mTOR蛋白表达显著升高(P＜0.05);与AD组小鼠相比,H102 干预组小鼠的RI显著提高(P＜0.05),小鼠脑组织中P-AMPK、LC3Ⅱ/Ⅰ比值显著升高(P＜0.05), P-mTOR蛋白表达显著降低(P＜0.05)。结论:H102 可通过激活AMPK-mTOR自噬相关通路,改善AD 小鼠的识别记忆能力。

关键词: 阿尔茨海默病, 自噬通路, 新物体识别, H102肽, 小鼠

Abstract: Objective:To study the effect of β-sheet blocking peptide H102 on the expression of AMPK-mTOR autophagy pathway-related protein in APP/PS1 double transgenic AD mice. Methods: Thirty male APP/PS1 transgenic male AD mice of 6 months old were randomly divided into AD group and H102 intervention group, and C57BL/6J male mice of the same age were used as control group (n=15). The mice in the HF group were administered with 5 μl (5.8 mg/kg) of H102 polypeptide solution through the nasal cavity at the same time period, and the mice in the control group and the AD group were given the same amount of blank adjuvant solution daily. The memory recognition ability was tested by a new object recognition experiment 30 days after continuous administration. Immunohistochemistry and Western blot were used to detect the expressions of phosphorylated AMP-activated protein kinase(P-AMPK),phosphorylated mammalian target of rapamycin (P-mTOR) and ratio of LC3Ⅱto LC3Ⅰ(LC3II/I )in brain tissue. Results: Compared with the control group, the new object recognition index (RI) of the AD group was significantly lower (P＜0.05), and the P-AMPK and LC3II/I ratios in the brain of the mice were significantly lower (P＜0.05). The expression of P-mTOR protein was increased significantly (P＜0.05). Compared with the AD group, the RI of the H102 intervention group was increased significantly (P＜0.05), and the P-AMPK and LC3II/I ratios in the brain tissue of the mice were increased significantly (P＜0.05). The expression of P-mTOR protein was decreased significantly (P＜0.05). Conclusion: H102 can improve the recognition and memory ability of AD mice by activating the AMPK-mTOR autophagy-related pathway.

Key words: Alzheimer&apos, s disease, autophagy pathway, new object recognition, H102 peptide, mouse

单尚然, 蒋方, 徐淑梅. β片层阻断肽H102对AD小鼠识别记忆能力和脑内AMPK-mTOR自噬相关通路的影响[J]. 中国应用生理学杂志, 2019, 35(1): 1-4.

SHAN Shang-ran, JIANG Fang, XU Shu-mei. Effects of H102 on the memory recognition ability and AMPK-mTOR autophagy-related pathway in AD mice[J]. CJAP, 2019, 35(1): 1-4.

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