Alz Res Therapy: 未患糖尿病的痴呆患者,胰岛素抵抗可反映神经退行性变化

2021-11-11 Freeman MedSci原创

在非糖尿病AD中,外周胰岛素抵抗与海马糖代谢降低和灰质体积降低独立相关

阿尔茨海默病(AD)是最常见的痴呆症类型,影响着全世界近4000万人,是本世纪的一个主要公共卫生紧急情况。在神经病理学上,AD的特点是淀粉样β(Aβ)肽的细胞外积累,也被称为斑块,以及细胞内的神经纤维缠结(NFT),即由tau蛋白过度磷酸化产生的聚合体。

这些神经毒性肽在大脑皮层的积累最终导致了神经元的死亡和认知功能的逐渐和渐进的下降。一些干预性试验针对AD的这两个主要病理机制,但不幸的是,这些治疗策略并没有带来成功的治疗,尽管一些研究仍在进行。

另一方面,最成功的AD预防策略与针对可改变的风险因素有关。其中,越来越多的证据表明2型糖尿病和AD之间有密切关系。2型糖尿病是AD的一个风险因素,流行病学数据显示,与非糖尿病患者相比,糖尿病患者的AD风险几乎翻倍。

尽管确切的潜在机制仍不清楚,但许多研究表明,胰岛素抵抗是AD的一个关键风险因素。胰岛素抵抗被定义为组织对胰岛素作用的反应性降低。在AD中,与对照组相比,外周胰岛素抵抗更为常见;在鹿特丹研究中,即使没有2型糖尿病,胰岛素抵抗也与3年后的AD风险增加有关。

除了外周作用外,胰岛素在大脑功能中也起着重要作用。神经元胰岛素受体的激活可以诱导树突发芽、神经元干细胞的激活、细胞生长和修复。胰岛素信号诱导胰岛素降解酶(IDE)的表达,该酶参与胰岛素和Aβ的降解;高胰岛素血症可能决定了对IDE依赖的Aβ降解的竞争性抑制,导致Aβ的积累。胰岛素也似乎通过调节磷酸化的tau水平而具有神经保护的作用。胰岛素抵抗与C-反应蛋白和IL-6等促炎症细胞因子水平的升高有关,这些因子与Aβ在大脑中的沉积有关。此外,胰岛素能改善人类的大脑功能,如注意力、记忆力和认知能力;

事实上,胰岛素受体在海马和皮质、丘脑以及下丘脑等代谢控制的关键区域都很丰富。然而,最近在AD受试者中进行的鼻腔内胰岛素试验的证据表明,在12个月后的认知结果方面并没有获益。


有研究表明,全身性胰岛素抵抗和高胰岛素血症可能通过血脑屏障中胰岛素受体减少的补偿机制来降低大脑的胰岛素水平。此外,脑脊液(CSF)中的胰岛素水平与血浆中的胰岛素水平相关,这表明大脑中的大部分胰岛素来自于循环中的胰岛素。因此,有证据表明,外周胰岛素抵抗与脑部胰岛素作用受损有关,但其机制仍有待阐明。最近的证据表明,脑部胰岛素抵抗可能是AD神经病理学发展的一个重要诱因。有趣的是,最近的研究表明,接受抗糖尿病药物杜拉鲁肽治疗的糖尿病患者的认知能力有明显的改善,这表明胰岛素抵抗在糖尿病患者的认知功能障碍中的潜在作用。然而,外周胰岛素抵抗在非糖尿病AD受试者中的作用还没有被探讨过。

藉此,英国帝国理工的dGrazia Daniela Femminella等人, 在这项研究中探究了外周胰岛素抵抗与突触功能和神经变性的标志物,即脑葡萄糖代谢率和MRI体积变化,以及脑小血管疾病,即白质病变(WML)体积,在非糖尿病阿尔茨海默病受试者中的可能联系。

他们纳入了有130名非糖尿病的AD受试者接受了MRI和[18F]FDG PET扫描,并插入动脉插管进行了放射性测量。T1容积和FLAIR序列是在3-T MRI扫描仪上获得的。这些受试者在扫描当天禁食4小时后还进行了葡萄糖和胰岛素水平的测量。胰岛素抵抗是通过更新的平衡模型评估(HOMA2)计算。

对于[18F]FDG的分析,脑葡萄糖代谢率(rCMRGlc)参数图像是用光谱分析生成。

他们发现:在这个非糖尿病的AD人群中,HOMA2与海马rCMRGlc,以及总灰质体积呈负相关。

在HOMA2、海马体积和WMLs之间没有观察到明显的相关关系。

这个研究的重要意义在于发现了:在非糖尿病AD中,外周胰岛素抵抗与海马糖代谢降低和灰质体积降低独立相关,表明外周胰岛素抵抗可能通过其对脑糖代谢和神经变性的作用影响AD的病理。

 

原文出处:
Femminella GD, Livingston NR, Raza S, et al. Does insulin resistance influence neurodegeneration in non-diabetic Alzheimer’s subjects? Alz Res Therapy. 2021;13(1):47. doi:10.1186/s13195-021-00784-w

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    2022-06-23 baoya
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    2021-11-11 冷浩厦

    太厉害了

    0

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    2021-11-11 neuro.Dr

    老年性痴呆,未来还是希望借助神经电生理吧,也许更为有效!

    0

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一项来自美国的研究发现,坚持MIND饮食与痴呆症患病风险和死亡率的降低有关。作者表明,健康饮食能够减缓衰老对人体的影响,包括对大脑的影响。

超65万人研究:注意力不集中、思维混乱……老年人有这些表现,痴呆风险高3倍!

谵妄是导致老年人痴呆和死亡的强有力危险因素,相比于无谵妄发作的患者,至少有一次谵妄发作的住院老年患者新确诊痴呆的风险高出3倍,每增加一次谵妄发作,痴呆风险增加20%。

警惕中老年“胖瘦子”!新研究:肌肉流失和过度肥胖或与痴呆、死亡相关

一项基于人群的前瞻性队列研究基于英国生物银行的数据,探索了肌肉减少性肥胖和肌肉减少症与痴呆风险的关系,发现肌肉减少性肥胖和肌肉减少症分别与不同程度的痴呆风险增加相关。

JAMDA:高血脂能让痴呆风险升高51%!

,Journal of the American Medical Directors Association发表一项纵向队列研究,表明确诊高脂血症的年龄越小,后续发生痴呆的风险就越高。

痴呆风险升高51%!北大&协和医学院团队研究:高血脂的人要注意

近日,Journal of the American Medical Directors Association发表一项纵向队列研究,表明确诊高脂血症的年龄越小,后续发生痴呆的风险就越高。

横跨75年研究:脑子越大,越不容易痴呆?

人类的大脑是在变大还是变小?大脑越大就越健康吗?

2022 欧洲共识:MCI和轻度痴呆初级阶段的诊断和治疗

意大利阿尔兹海默病专家组 · 2022-10-09

适合痴呆症患者的急救护理:老年急救护理应用研究网络范围审查和共识会议的结果

急性期后和长期护理学会(AMDA,The Society for Post-Acute and Long-Term Care Medicine) · 2022-08-01

痴呆及阿尔茨海默病进展要点简析

四川大学华西医院 · 2022-07-26