An altered extracellular matrix-integrin interface contributes to Huntington's disease-associated CNS dysfunction in glial and vascular cells.

An altered extracellular matrix-integrin interface contributes to Huntington's disease-associated CNS dysfunction in glial and vascular cells.
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DOI:
10.1093/hmg/ddac303
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发表时间:
2023-04-20
影响因子:
3.5
通讯作者:
--
中科院分区:
生物学2区
文献类型:
--
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星形胶质细胞和脑内皮细胞是构成血脑屏障(BBB)的神经血管单位的组成部分,它们的功能障碍有助于亨廷顿病(HD)的发病机制。确定这些细胞对疾病的贡献可以告知细胞类型特异性效应,并发现新的疾病修饰治疗靶点。这些细胞表达整联蛋白(ITG)粘附受体,其将细胞锚于细胞外基质(ECM)以维持BBB的完整性。我们使用HD患者衍生的诱导多能干细胞(iPSC)建模来研究星形胶质细胞和脑微血管内皮细胞中的ECM-ITG界面,并发现人iPSC衍生细胞中的ECM-ITG失调可能导致HD中BBB功能障碍。这种破坏具有功能性后果,因为在HD果蝇模型中减少神经胶质中的ITG表达抑制了疾病相关的CNS功能障碍。由于ITG可以在治疗上靶向,并且操纵ITG信号传导可以预防其他疾病中的神经变性,因此定义ITG在HD中的作用可以提供一种新的干预策略来减缓CNS病理生理学以治疗HD。
Astrocytes and brain endothelial cells are components of the neurovascular unit that comprises the blood–brain barrier (BBB) and their dysfunction contributes to pathogenesis in Huntington’s disease (HD). Defining the contribution of these cells to disease can inform cell-type-specific effects and uncover new disease-modifying therapeutic targets. These cells express integrin (ITG) adhesion receptors that anchor the cells to the extracellular matrix (ECM) to maintain the integrity of the BBB. We used HD patient-derived induced pluripotent stem cell (iPSC) modeling to study the ECM–ITG interface in astrocytes and brain microvascular endothelial cells and found ECM–ITG dysregulation in human iPSC-derived cells that may contribute to the dysfunction of the BBB in HD. This disruption has functional consequences since reducing ITG expression in glia in an HD Drosophila model suppressed disease-associated CNS dysfunction. Since ITGs can be targeted therapeutically and manipulating ITG signaling prevents neurodegeneration in other diseases, defining the role of ITGs in HD may provide a novel strategy of intervention to slow CNS pathophysiology to treat HD.
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