摘要
背景:阿尔茨海默病 (AD) 是最常见的神经退行性疾病,消极的生活方式因素可能导致其发病。来自人类和小鼠模型的大量证据表明,与高脂肪饮食 (HFD) 相关的胰岛素抵抗 (IR) 会增加患 AD 和与年龄相关的淀粉样蛋白生成的风险。
目的:本研究的目的是证实和阐明 HFD 对 AD 模型小鼠淀粉样变性和认知缺陷的影响。
方法:我们在此表明,四个月的 HFD 喂养会增加 APP/PS1 小鼠(用作 AD 模型)的外周和大脑的 IR。同时,长期HFD会加剧APP/PS1小鼠的认知缺陷并损害树突完整性和突触蛋白的表达。此外,HFD 诱导 β-分泌酶 (BACE1) 表达增加和胰岛素降解酶 (IDE) 表达减少,导致 β-淀粉样蛋白 (Aβ) 积累。
结论:我们的数据表明,长期 HFD 伴随 IR 会促进 Aβ 毒性和认知缺陷,表明可改变的生活方式危害,如 HFD 诱导的 IR 可能有助于 AD 发病机制。
关键词: 阿尔茨海默病 (AD)、认知障碍、高脂肪饮食 (HFD)、胰岛素抵抗 (IR)、β-淀粉样蛋白 (Aβ)、胰岛素降解酶 (IDE)、β-分泌酶 (BACE1)。
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