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阻断PI3K可恢复与大脑小血管疾病相关的年龄相关的神经血管合缺陷

Pratish Thakore¹, Evan Yamasaki¹, Sher Ali¹

¹Department of Pharmacology, Center for Molecular and Cellular Signaling in the Cardiovascular System University of Nevada, Reno School of Medicine, Reno, NV 89557-0318.

Proceedings of the National Academy of Sciences of the United States of America

|August 22, 2023

概括

研究人员在脑小血管疾病 (cSVD) 鼠标模型的大脑毛细血管中发现了酸4,5双酸盐 (PIP2) 的缺陷,导致神经血管合 (NVC) 损伤. 阻止PI3K恢复了NVC并改善了记忆力.

科学领域:

神经科学是一个神经科学.
血管生物学血管生物学
分子生物学分子生物学

背景情况:

神经血管合 (NVC) 对大脑功能至关重要,通过脑毛细血管将血液流向活动区域.
大脑小血管疾病 (cSVD) 可以损害NVC,导致认知能力下降.
一个特定的小鼠模型 (Col4a1突变) 呈现出年龄相关的NVC和记忆缺陷.

研究的目的:

为了研究cSVD的Col4a1突变小鼠模型中缺陷的NVC背后的分子机制.
探索酸4,5双酸 (PIP2) 和相关信号通路在毛细血管功能中的作用.
评估针对这些途径进行认知改善的治疗潜力.

主要方法:

使用了Col4a1突变小鼠模型,表现出年龄依赖的cSVD.
评估了毛细血管到动脉的扩张和功能性高血压.
在大脑毛细血管内皮细胞中研究了PIP2水平和内向纠正K+ (Kir2.1) 通道活性.
服用PI3K抑制剂并评估它们对NVC和记忆的影响.

主要成果:

年龄较大的Col4a1突变小鼠在脑毛细血管中显示PIP2枯竭,损害了Kir2.1通道活性和NVC.
用抑制剂阻断PI3K恢复了Kir2.1活性,毛细血管扩张和功能性高血.
在老年突变小鼠中慢性PI3K抑制改善了记忆功能.

结论:

大脑毛细血管中缺陷的PIP2代谢有助于cSVD中NVC损伤.
抑制PI3K代表了对cSVD相关认知缺陷的有前途的治疗策略.
通过PI3K抑制恢复NVC为cSVD的记忆丧失提供了潜在的治疗方法.

关键词:

在 COL4A1A1 中使用.在 Kir2.1 频道上.大脑小血管疾病是大脑小血管疾病.细胞外矩阵是细胞外矩阵.功能性高血症是什么意思

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