CNS lymphatic drainage and neuroinflammation are regulated by meningeal lymphatic vasculature

A Louveau, J Herz, MN Alme, AF Salvador… - Nature …, 2018 - nature.com
A Louveau, J Herz, MN Alme, AF Salvador, MQ Dong, KE Viar, SG Herod, J Knopp, JC Setliff…
Nature neuroscience, 2018nature.com
Neuroinflammatory diseases, such as multiple sclerosis, are characterized by invasion of the
brain by autoreactive T cells. The mechanism for how T cells acquire their encephalitogenic
phenotype and trigger disease remains, however, unclear. The existence of lymphatic
vessels in the meninges indicates a relevant link between the CNS and peripheral immune
system, perhaps affecting autoimmunity. Here we demonstrate that meningeal lymphatics
fulfill two critical criteria: they assist in the drainage of cerebrospinal fluid components and …
Abstract
Neuroinflammatory diseases, such as multiple sclerosis, are characterized by invasion of the brain by autoreactive T cells. The mechanism for how T cells acquire their encephalitogenic phenotype and trigger disease remains, however, unclear. The existence of lymphatic vessels in the meninges indicates a relevant link between the CNS and peripheral immune system, perhaps affecting autoimmunity. Here we demonstrate that meningeal lymphatics fulfill two critical criteria: they assist in the drainage of cerebrospinal fluid components and enable immune cells to enter draining lymph nodes in a CCR7-dependent manner. Unlike other tissues, meningeal lymphatic endothelial cells do not undergo expansion during inflammation, and they express a unique transcriptional signature. Notably, the ablation of meningeal lymphatics diminishes pathology and reduces the inflammatory response of brain-reactive T cells during an animal model of multiple sclerosis. Our findings demonstrate that meningeal lymphatics govern inflammatory processes and immune surveillance of the CNS and pose a valuable target for therapeutic intervention.
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