Neural Regen Res:小檗碱对阿尔茨海默病小鼠模型的神经保护作用

2022-08-03 August MedSci原创

阿尔茨海默病(Alzheimer's disease,AD)是一种常见的神经退行性疾病,占全球痴呆病例的 60-80%,其临床症状主要包括进行性认知障碍、记忆障碍、语言障碍和人格改变。

小檗碱是从黄连的根茎中提取的天然活性成分。1970 年首次报道了其对神经系统的药理作用。以往的研究表明,小檗碱对阿尔茨海默病具有神经保护作用,包括拮抗 tau 磷酸化,抑制乙酰胆碱酯酶活性和神经细胞凋亡。然而,其低生物利用度和常规给药的不良反应限制了其临床应用。

BR纳米脂质体和DiR纳米脂质体的粒径、PI、EE和Lf接枝率:

在此项研究中,使用具有低毒性、高包封率和可生物降解性的脂质体制备了小檗碱纳米脂质体,并用乳铁蛋白对其进行了修饰。乳铁蛋白修饰的小檗碱纳米脂质体粒径均匀,包封率高。使用乳铁蛋白修饰的小檗碱纳米脂质体治疗通过将淀粉样蛋白-β1-42 注射到侧脑室建立的阿尔茨海默病小鼠模型。乳铁蛋白修饰的小檗碱纳米脂质体抑制海马乙酰胆碱酯酶活性和细胞凋亡,减少大脑皮层中的 tau 过度磷酸化,并改善小鼠行为。这些发现表明,用乳铁蛋白修饰可以增强小檗碱纳米脂质体在阿尔茨海默病中的神经保护作用。

AD样Aβ神经毒性模型小鼠中不同DiR纳米脂质体在不同时间点的分布

不同BR制剂对AD样Aβ神经毒性模型小鼠海马组织中凋亡蛋白Bax和Bcl-2表达水平的影响:

总之,此研究成功地制备了 Lf 修饰的聚乙二醇化 BR 纳米脂质体,并证明该修饰增强了 BR 的抗 AD 作用。Lf 修饰改善了 BR 纳米脂质体的脑靶向和神经保护作用。BR-Lf通过抑制 AChE 活性、拮抗 tau 过度磷酸化和抑制神经元凋亡来改善 Aβ 1-42诱导的 AD 样 Aβ 神经毒性小鼠模型的行为能力。研究结果表明,BR-Lf 是一种很有前途的抗 AD 制剂。

 

原文:Wang L, Zhou BQ, Li YH, Jiang QQ, Cong WH, Chen KJ, Wen XM, Wu ZZ. Lactoferrin modification of berberine nanoliposomes enhances the neuroprotective effects in a mouse model of Alzheimer's disease. Neural Regen Res. 2023 Jan;18(1):226-232. doi: 10.4103/1673-5374.344841. PMID: 35799547; PMCID: PMC9241388.

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