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CNS lymphatic drainage and neuroinflammation are regulated by meningeal lymphatic vasculature [2D2 T cells]

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.

ORGANISM(S): Mus musculus

PROVIDER: GSE99764 | GEO | 2018/09/18

REPOSITORIES: GEO

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CNS lymphatic drainage and neuroinflammation are regulated by meningeal lymphatic vasculature

Project description: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.

2018-09-18 | GSE99743 | GEO

Project description:The meningeal lymphatic network—housed within the dural meninges surrounding the brain— is critical for cerebrospinal fluid (CSF) drainage. Through continuous brain interstitial fluid (ISF) mixing with CSF via the glymphatic system, this lymphatic network facilitates the removal of central nervous system (CNS) waste. During aging and in Alzheimer’s disease (AD), attenuated meningeal lymphatic drainage promotes the buildup of toxic misfolded proteins—including amyloid beta—in the CNS. Alleviating this age-related meningeal lymphatic dysfunction represents a promising therapeutic strategy to alleviate AD pathology. However, the mechanisms underlying this lymphatic decline remain elusive. Here we demonstrate that age-related alterations in meningeal immunity contribute to meningeal lymphatic impairment. Single-cell RNA-sequencing of dural lymphatic endothelial cells in aged mice demonstrated a response signature to the cytokine IFNγ, which was elevated in the aged dura due to meningeal T cell accumulation. Chronic elevation of IFNγ in the meninges of young mice via AAV-mediated overexpression altered lymphatic adherans junctions and impaired CSF drainage to deep cervical lymph nodes—comparable to the deficits observed in aged mice. Direct disruption of lymphatic junctions via CSF-delivered VE-Cadherin disrupting antibodies was sufficient to phenocopy impairments in CSF drainage. Therapeutically, IFNγ neutralization in aged mice alleviated age-related impairments in meningeal lymphatic function. These data suggest manipulation of meningeal immunity as a viable therapeutic target to normalize CSF drainage in aged mice and alleviate the pathology in AD mice associated with impaired waste removal.

2023-03-10 | GSE217312 | GEO

2023-03-10 | GSE217276 | GEO

Enhanced meningeal lymphatic drainage ameliorates lipopolysaccharide-induced brain injury in aged mice

Project description:Sepsis-associated encephalopathy (SAE) is an acute cerebral dysfunction caused by sepsis. Neuroinflammation induced by sepsis is considered a potential mechanism of SAE; however, very little is known about the role of the meningeal lymphatic system in SAE. The aged mice with SAE showed a significant decrease in the drainage of OVA-647 into the dCLNs and the coverage of the Lyve-1 in the meningeal lymphatic, indicating that sepsis impaired meningeal lymphatic drainage and morphology. The meningeal lymphatic function of aged mice was more vulnerable to sepsis in comparison to young mice. Sepsis also decreased the protein levels of caspase-3 and PSD95, which was accompanied by reductions in the activity of hippocampal neurons. Microglia were significantly activated in the hippocampus of SAE mice, which was accompanied by an increase in neuroinflammation, as indicated by increases in interleukin-1 beta, interleukin-6 and Iba1 expression. Cognitive function was impaired in aged mice with SAE. However, the injection of AAV1-VEGF-C significantly increased coverage in the lymphatic system and tracer dye uptake in dCLNs, suggesting that AAV1-VEGF-C promotes meningeal lymphangiogenesis and drainage. Furthermore, AAV1-VEGF-C reduced microglial activation and neuroinflammation and improved cognitive dysfunction. Improvement of meningeal lymphatics also reduced sepsis-induced expression of disease-associated genes in aged mice. Pre-existing lymphatic dysfunction by ligating bilateral dCLNs aggravated sepsis-induced neuroinflammation and cognitive impairment.

2023-11-30 | GSE247222 | GEO

Neuroinflammation creates an immune regulatory niche at the meningeal lymphatic vasculature near the cribriform plate

Project description:We report the use of single cell RNA sequencing of meningeal lymphatic endothelial cells near the cribriform plate in both naïve mice, and during experimental autoimmune encephalomyelitis (EAE), a mouse model of multiple sclerosis. By sorting for meningeal lymphatics near the cribriform plate, we identified that these lymphatic endothelial cells acquire an altered phenotype during neuroinflammation, where they become enriched in genes involved in leukocyte crosstalk including adhesion molecules, antigen processing and presentation, and tolerance, thus becoming a unique site of immune regulation.

2021-06-01 | GSE175802 | GEO

VEGF-C prophylaxis promotes lymphatic drainage, microglia modulation, and neuroprotection in response to stroke injury

Project description:Meningeal lymphatic vessels (MLVs) promote tissue clearance and immune surveillance in the central nervous system (CNS). Vascular endothelial growth factor-C (VEGF-C) regulates MLV development and maintenance and has therapeutic potential for treating neurological disorders. Herein, we investigated the effects of VEGF-C overexpression on brain fluid drainage and ischemic stroke outcomes in mice. Intra-cerebrospinal administration of an adeno-associated virus expressing mouse full-length VEGF-C (AAV-mVEGF-C) increased CSF drainage to the deep cervical lymph nodes (dCLNs) by enhancing lymphatic growth, and upregulated neuroprotective signaling pathways identified by single nuclei RNA sequencing of brain cells. In a mouse model of ischemic stroke, AAV-mVEGF-C pretreatment reduced stroke injury and ameliorated motor performances in the subacute stage, associated with mitigated microglia-mediated inflammation and increased BDNF signaling in brain cells. Neuroprotective effects of VEGF-C were lost upon ligation of the dCLN afferent lymphatics, and not mimicked by acute post-stroke VEGF-C injection. We conclude that VEGF-C prophylaxis promotes multiple vascular, immune, and neural responses that culminate in a protection against neurological damage in acute ischemic stroke.

2024-01-18 | GSE253051 | GEO

Meningeal lymphatic dysfunction exacerbates traumatic brain injury pathogenesis

Project description:The goal of this study is to use bulk RNA-sequencing of the right brain hemisphere to observe the effects of TBI in the context of pre-existing meningeal lymphatic dysfunction in mice. We find that pre-existing meningeal lymphatic dysfunction potentiates the inflammatory response to TBI, suggesting an important role for the meningeal lymphatics in injury site drainage and proper recovery.

2020-07-25 | GSE155063 | GEO

DSCR1 upregulation enhances dural meningeal lymphatic drainage to attenuate amyloid pathology of Alzheimer’s disease

Project description:Purpose: To further understand the beneficial effects of DSCR1 on the lymphatic system of 5XFAD mice, we investigated the transcriptional landscape of meningeal lymphatic endothelial cells (mLECs) by performing RNA sequencing.

2021-08-16 | GSE180275 | GEO

Gene expression analysis of mouse lymphatic endothelial cells (LECs) from the subcapsular sinus (SS, afferent) and lymphatic sinus (LS, efferent)

2016-08-24 | GSE68371 | GEO

Gene expression analysis of mouse lymphatic endothelial cells (LECs) from the subcapsular sinus (SS, afferent) and lymphatic sinus (LS, efferent)

Project description:Afferent lymphatic vessels bring antigens and diverse populations of leukocytes to draining lymph nodes, but efferent lymphatics allow only lymphocytes to leave the nodes. Despite fundamental importance of afferent vs. efferent lymphatics in immune response and cancer spread, molecular characteristics of these different arms of the lymphatic vasculature are largely unknown. In this work we report marked transcriptional differences between afferent and efferent lymphatic endothelial cells. Mouse inguinal, axillary, and brachial lymphnodes were collected and cryomolds prepared for laser-capture microdissection. Frozen sections were stained with various cell marker antibodies and micro-dissection performed to collect lymphatic endothelial cells. Total RNA was extracted from the cells and used in microarray analysis. Alternatively, popliteal, caudal, lumbar, inguinal, mesenteric, renal, axillary, brachial, deep and superficial cervical LN were enzymatically digested, the cells stained, and FACs sorted before RNA isolation.

2016-08-24 | E-GEOD-68371 | biostudies-arrayexpress

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