J Alzheimers Dis:高脂饮食可导致认知损害

2013-09-25 佚名 医学论坛网

近期发表于《阿尔茨海默病杂志》一项研究称高脂/高胆固醇饮食可导致脑胰岛素抵抗,胰岛素/IGF-1信号(IIS)变化导致“正常”鼠出现阿尔茨海默病样认知损害。 既往已有研究表明,高脂/高胆固醇(HFC)饮食会导致鼠工作记忆丧失,并与神经炎性改变和AβPP处理增加有关。本研究为进一步探索与认知损害相关的分子本质,观察了tau蛋白磷酸化和包括GSK3在内的IIS,以及特定突触蛋白水平的变化。 研究中

近期发表于《阿尔茨海默病杂志》一项研究称高脂/高胆固醇饮食可导致脑胰岛素抵抗,胰岛素/IGF-1信号(IIS)变化导致“正常”鼠出现阿尔茨海默病样认知损害。

既往已有研究表明,高脂/高胆固醇(HFC)饮食会导致鼠工作记忆丧失,并与神经炎性改变和AβPP处理增加有关。本研究为进一步探索与认知损害相关的分子本质,观察了tau蛋白磷酸化和包括GSK3在内的IIS,以及特定突触蛋白水平的变化。

研究中,用能检测高磷酸化tau的抗磷酸-tau抗体(如PHF1和磷酸化-Thr-231 tau蛋白)对HFC 喂养两月的C57BL/6鼠海马组织进行免疫印迹。Tau磷酸化与激活的GSK3相关,后者是一种显性tau激酶,在IIS控制下保持非激活状态。已有研究证实,IIS本身会因为高脂饮食而损伤,因胰岛素受体底物-1和磷酸-Akt的水平下调导致。

结果显示,虽然免疫印迹分析未观察到突触前蛋白(如突触素)水平因HFC作用发生明显变化,但突触后蛋白PSD95、树突棘突特异性蛋白drebrin(突触可塑性变化的指标)都表现出明显下调。

该结果与先前相同模型研究的发现一致,提示高脂/高胆固醇饮食导致脑胰岛素抵抗,而IIS的变化

原文阅读

Bhat NR, Thirumangalakudi L.Increased Tau Phosphorylation and Impaired Brain Insulin/IGF Signaling in Mice Fed a High Fat/High Cholesterol Diet.J Alzheimers Dis. 2013 Jan 1;36(4):781-9.

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    2014-02-22 anminleiryan
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    2013-09-27 pcw111

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