Arachnoid granulations are lymphatic conduits that communicate with bone marrow and dura-arachnoid stroma.

Arachnoid granulations are lymphatic conduits that communicate with bone marrow and dura-arachnoid stroma.
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DOI:
10.1084/jem.20220618
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发表时间:
2023-02-06
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Mehta RI
Mehta RI
中科院分区:
其他
文献类型:
--
作者:
Shah T;Leurgans SE;Mehta RI;Yang J;Galloway CA;de Mesy Bentley KL;Schneider JA;Mehta RI

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蛛网膜颗粒的研究很少。我们发现,他们窝藏免疫细胞和沟通与perisinus空间,这表明颗粒subserve神经免疫的作用和功能的transarachnoidal通道。这些数据提出了关于淋巴结-淋巴管偶联和疾病机制的新理论。蛛网膜颗粒化(AG)的研究很少。历史报告表明,它们通过被动地将脑脊液(CSF)转运到硬脑膜静脉窦来调节脑容量。在这里,我们研究了人类大脑AG的微观结构,目的是了解它们在生理学中的作用。我们发现AG的大小,叶状,位置,内容和程度的表面封装显着的变化。高分辨率显微镜显示AG由外囊和内基质核心区组成。精细和多孔的框架表明AG在机械CSF过滤中的未表征功能。此外,内部细胞因子和免疫细胞富集意味着这些结构定位于脑-脑膜淋巴界面的未探索的神经免疫特性。此外,还确定了AG结构的年龄相关变化。这项研究首次描绘了与perisinus空间沟通的内部通道的微观网络,表明AG作为transarachnoidal流动通道具有重要功能。这些数据提出了关于胶质细胞-淋巴偶联和CSF抗原清除、稳态和疾病机制的新理论。
Arachnoid granulations are poorly investigated. We show that they harbor immune cells and communicate with perisinus spaces, suggesting that granulations subserve neuroimmune roles and function as transarachnoidal passageways. These data raise new theories regarding glymphatic–lymphatic coupling and mechanisms of diseases. Arachnoid granulations (AG) are poorly investigated. Historical reports suggest that they regulate brain volume by passively transporting cerebrospinal fluid (CSF) into dural venous sinuses. Here, we studied the microstructure of cerebral AG in humans with the aim of understanding their roles in physiology. We discovered marked variations in AG size, lobation, location, content, and degree of surface encapsulation. High-resolution microscopy shows that AG consist of outer capsule and inner stromal core regions. The fine and porous framework suggests uncharacterized functions of AG in mechanical CSF filtration. Moreover, internal cytokine and immune cell enrichment imply unexplored neuroimmune properties of these structures that localize to the brain–meningeal lymphatic interface. Dramatic age-associated changes in AG structure are additionally identified. This study depicts for the first time microscopic networks of internal channels that communicate with perisinus spaces, suggesting that AG subserve important functions as transarachnoidal flow passageways. These data raise new theories regarding glymphatic–lymphatic coupling and mechanisms of CSF antigen clearance, homeostasis, and diseases.
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