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Interleukin-3 coordinates glial-peripheral immune crosstalk to incite multiple sclerosis

ABSTRACT: Interleukin-3 coordinates glial-peripheral immune crosstalk to incite multiple sclerosis

PROVIDER: PRJNA946811 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR23924500_1.fastq.gz	Fastqsanger.gz
	SRR23924500_2.fastq.gz	Fastqsanger.gz
	SRR23924600_1.fastq.gz	Fastqsanger.gz
	SRR23924600_2.fastq.gz	Fastqsanger.gz
	SRR23924501_1.fastq.gz	Fastqsanger.gz

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Interleukin-3 coordinates glial-peripheral immune crosstalk to incite multiple sclerosis

Project description:Multiple sclerosis (MS) is a neuroinflammatory disease of the central nervous system (CNS). While CNS-resident glial cells and infiltrating immune cells contribute to MS pathogenesis, the networks that govern peripheral-central immune crosstalk and coordinate functionality among these ontologically distinct populations remain unclear. Here we show, in mice and humans, that astrocyte- and CD44hiCD4+ T cell-sourced interleukin-3 (IL-3) programs microglia and infiltrating myeloid cells to exacerbate neuroinflammation by inciting a cellular recruitment program that drives the accrual of immune cells in the CNS thereby worsening MS and its preclinical model experimental autoimmune encephalomyelitis (EAE). We find that CNS-resident astrocytes and peripherally-derived CD44hiCD4+ T cells generate IL-3 while resident microglia and infiltrating monocytes, macrophages, and dendritic cells respond to the cytokine by expressing IL-3Rɑ, IL-3's specific receptor. Astrocytic and T cell IL-3 elicit an immune migratory, recruitment, and chemotactic program by IL-3Rɑ+ myeloid cells that enhances immune cell infiltration into the CNS leading to exacerbated neuroinflammation, demyelination, and clinical disease. Multiregional single-nuclei RNA sequencing (snRNAseq) of human CNS tissue from unaffected controls and MS patients reveals the appearance of a subset of IL3RA-expressing myeloid cells in MS plaques with unique recruitment, migratory, and chemotactic programing and function. In humans with MS, IL3RA expression by plaque myeloid cells and IL-3 levels in the cerebrospinal fluid (CSF) predict myeloid and T cell abundance and recruitment into the CNS. Together, our findings establish IL-3:IL-3RA signaling as a bidirectional glial-peripheral immune crosstalk network that promotes neuroinflammation, prompts immune cell recruitment to the CNS, and worsens MS.

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Interleukin-3 coordinates glial-peripheral immune crosstalk to incite multiple sclerosis.

Project description:Glial cells and central nervous system (CNS)-infiltrating leukocytes contribute to multiple sclerosis (MS). However, the networks that govern crosstalk among these ontologically distinct populations remain unclear. Here, we show that, in mice and humans, CNS-resident astrocytes and infiltrating CD44hiCD4+ T cells generated interleukin-3 (IL-3), while microglia and recruited myeloid cells expressed interleukin-3 receptor-ɑ (IL-3Rɑ). Astrocytic and T cell IL-3 elicited an immune migratory and chemotactic program by IL-3Rɑ+ myeloid cells that enhanced CNS immune cell infiltration, exacerbating MS and its preclinical model. Multiregional snRNA-seq of human CNS tissue revealed the appearance of IL3RA-expressing myeloid cells with chemotactic programming in MS plaques. IL3RA expression by plaque myeloid cells and IL-3 amount in the cerebrospinal fluid predicted myeloid and T cell abundance in the CNS and correlated with MS severity. Our findings establish IL-3:IL-3RA as a glial-peripheral immune network that prompts immune cell recruitment to the CNS and worsens MS.

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