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MPS vaccination alters long-term gene expression of antigen-presenting cells in lymph nodes

ABSTRACT: MPS vaccination alters long-term gene expression of antigen-presenting cells in lymph nodes

PROVIDER: PRJEB71812 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	ERR12422180_1.fastq.gz	Fastqsanger.gz
	ERR12422180_2.fastq.gz	Fastqsanger.gz
	ERR12422181_1.fastq.gz	Fastqsanger.gz
	ERR12422181_2.fastq.gz	Fastqsanger.gz
	ERR12422182_1.fastq.gz	Fastqsanger.gz

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MPS vaccination alters long-term gene expression of antigen-presenting cells in lymph nodes

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Project description:Antigen presenting dendritic cells (DCs) and monocytes capture and transport antigens from barrier tissues for presentation to antigen-specific T cells in the draining-lymph nodes (LNs). While DCs enter LNs through afferent lymphatics in a CCR7-dependent manner, how exactly antigen-carrying monocytes reach LNs is less clear since monocytes do not express CCR7 and can also enter LNs via the bloodstream. In steady state, and following injection of several PAMPs, scRNA-seq data on LN mononuclear phagocytes identified LN resident versus migratory type 1 and type 2 conventional (c)DCs despite downregulation of DC subset-defining transcripts, such as Xcr1, Clec9a, H2-Ab1, Sirpa, and Clec10a on migratory cDCs. Migratory cDCs gained expression of transcripts controlling cellular migration such as Ccr7, Ccl17, Ccl22, and Ccl5, while migratory monocytes expressed Ccr5 without Ccr7. Using two tracking methods and a gating strategy that clearly distinguishes migratory CD88hiCD26lo monocytes from CD88-CD26hi cDCs, we found that both captured antigens in the lung and migrated to lung-draining LNs. Using global and mixed-chimeric Ccl5-, Ccr2-, Ccr5-, Ccr7-, and Batf3-deficient mice, we found that CCR5+ monocytes follow CCL5-secreting migratory cDCs to reach the draining LN via lymphatic vessels. In a model of asthma, such recruited monocytes regulated the induction of type 2 immunity. Overall, our data suggest that CCL5-secreting migratory cDCs lay down the chemokine trail for CCR5+ antigen-presenting monocytes to reach draining lymph nodes and regulate adaptive immunity.

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