收稿日期: 2024-12-26
网络出版日期: 2025-04-30
基金资助
国家自然科学基金项目(82371258);新疆维吾尔自治区研究生研究创新基金资助项目(XJ2024G161)
Effect of EGCG on MPTP⁃induced Parkinson′s model mice via autophagy⁃lysosomal pathway
Received date: 2024-12-26
Online published: 2025-04-30
目的 探究表没食子儿茶素没食子酸酯(epigallocatechin gallate, EGCG)对1-甲基-4-苯基-1,2,3,6-四氢吡啶(1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine,MPTP)所诱导帕金森病模型小鼠的保护作用。 方法 将28只6 ~ 8周龄的雄性C57BL/6J小鼠随机分为4组:对照组、模型组及EGCG低剂量组[25 mg/(kg·d)]和EGCG高剂量组[50 mg/(kg·d)]。连续7 d腹腔注射MPTP 30 mg/(kg·d)制备PD小鼠模型。通过行为学指标检测、Western blot方法分析EGCG对MPTP诱导的PD模型小鼠的保护作用。 结果 (1)在行为学检测中,与模型组比较,经EGCG低、高治疗后小鼠的运动路程和速度得到明显改善(均P < 0.001),经EGCG高剂量治疗组的小鼠在中心路程所占百分比中也呈现出显著优势(P < 0.001)。(2)与对照组相比,模型组α-突触核蛋白沉积明显增加(P < 0.001);与模型组相比,EGCG低、高剂量组均降低了α-突触核蛋白沉积(均P < 0.001)。(3)与对照组相比,模型组小鼠黑质区Beclin 1和LC3蛋白表达量显著减少(均P < 0.001),p62蛋白表达量显著增加(P < 0.001);经EGCG治疗后,与模型组相比,EGCG低剂量组小鼠Beclin 1和LC3蛋白表达量有不同程度的增加(P < 0.01;P < 0.001),p62蛋白表达量显著下降(P < 0.001),EGCG高剂量组小鼠Beclin 1和LC3蛋白表达量有显著的增加(均P < 0.001),p62蛋白表达量显著下降(P < 0.001)。 结论 EGCG通过自噬-溶酶体途径降低了α-突触核蛋白的沉积,对MPTP诱导的PD模型小鼠起到了保护作用。
关键词: 帕金森病; α-突触核蛋白; 表没食子儿茶素没食子酸酯; 自噬; 自噬-溶酶体途径; 1-甲基-4-苯基-1,2,3,6-四氢吡啶
周旭 , 逯冉冉 , 任芳丽 , 彭小雨 , 杨新玲 . 表没食子儿茶素没食子酸酯通过自噬-溶酶体途径对MPTP诱导帕金森病模型小鼠的作用[J]. 实用医学杂志, 2025 , 41(8) : 1097 -1104 . DOI: 10.3969/j.issn.1006-5725.2025.08.002
Objective To investigate the protective effect of epigallocatechin gallate (EGCG) on 1?methyl?4?phenyl?1,2,3,6?tetrahydropyridine (MPTP)?induced Parkinson's disease model mice. Methods Twenty?eight male C57BL/6J mice aged 6 ~ 8 weeks were randomly divided into four groups: the control group, the model group, the low?dose EGCG group[25 mg/(kg·d)], and the high?dose EGCG group[50 mg/(kg·d)]. A Parkinson's disease (PD) mouse model was established by intraperitoneal injection of MPTP at a dose of 30 mg/ (kg·d) for 7 consecutive days. The protective effect of EGCG on MPTP?induced Parkinson's model mice was analyzed through behavioral index detection and Western blot method. Results (1)In the behavioral tests, compared with the model group, the movement distance and speed of mice treated with low?and high?dose EGCG were significantly improved (both P values < 0.001). The mice in the high?dose EGCG treatment group also showed a significant advantage in the percentage of the central path distance (P < 0.001). (2)Compared with the control group, the deposition of α?synuclein in the model group increased significantly (P < 0.001). Compared with the model group, both the low?and high?dose EGCG groups reduced the deposition of α?synuclein (both P < 0.001). (3)Compared with the control group, the expression levels of Beclin 1 and LC3 proteins in the substantia nigra region of mice in the model group decreased significantly (both P < 0.001), while the expression level of p62 protein increased significantly (P < 0.001). After treatment with EGCG, compared with the model group, the expression levels of Beclin 1 and LC3 proteins in mice of the low?dose EGCG group increased to varying degrees (P < 0.01; P < 0.001), and the expression level of p62 protein decreased significantly (P < 0.001). In the high?dose EGCG group, the expression levels of Beclin 1 and LC3 proteins increased significantly (both P < 0.001), and the expression level of p62 protein decreased significantly (P < 0.001). Conclusion EGCG reduces alpha?synuclein deposition via the autophagy?lysosomal pathway and protects against MPTP-induced Parkinson's disease model mice.
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