2024-02-07 ワシントン大学セントルイス校
<関連情報>
- https://source.wustl.edu/2024/02/how-does-waste-leave-the-brain/
- https://www.nature.com/articles/s41586-023-06993-7
硬膜と脳を直接つなぐ構造を発見 Identification of direct connections between the dura and the brain
Leon C. D. Smyth,Di Xu,Serhat V. Okar,Taitea Dykstra,Justin Rustenhoven,Zachary Papadopoulos,Kesshni Bhasiin,Min Woo Kim,Antoine Drieu,Tornike Mamuladze,Susan Blackburn,Xingxing Gu,María I. Gaitán,Govind Nair,Steffen E. Storck,Siling Du,Michael A. White,Peter Bayguinov,Igor Smirnov,Krikor Dikranian,Daniel S. Reich & Jonathan Kipnis
Nature Published:07 February 2024
DOI:https://doi.org/10.1038/s41586-023-06993-7
Abstract
The arachnoid barrier delineates the border between the central nervous system and dura mater. Although the arachnoid barrier creates a partition, communication between the central nervous system and the dura mater is crucial for waste clearance and immune surveillance1,2. How the arachnoid barrier balances separation and communication is poorly understood. Here, using transcriptomic data, we developed transgenic mice to examine specific anatomical structures that function as routes across the arachnoid barrier. Bridging veins create discontinuities where they cross the arachnoid barrier, forming structures that we termed arachnoid cuff exit (ACE) points. The openings that ACE points create allow the exchange of fluids and molecules between the subarachnoid space and the dura, enabling the drainage of cerebrospinal fluid and limited entry of molecules from the dura to the subarachnoid space. In healthy human volunteers, magnetic resonance imaging tracers transit along bridging veins in a similar manner to access the subarachnoid space. Notably, in neuroinflammatory conditions such as experimental autoimmune encephalomyelitis, ACE points also enable cellular trafficking, representing a route for immune cells to directly enter the subarachnoid space from the dura mater. Collectively, our results indicate that ACE points are a critical part of the anatomy of neuroimmune communication in both mice and humans that link the central nervous system with the dura and its immunological diversity and waste clearance systems.
