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• W4318539401 abstract "Abstract Background Mononuclear phagocytes (MNPs), including dendritic cells (DCs), monocytes (Mo), and macrophages (Mac), are key inducers of the adaptive immune response. MNPs could circulate between blood, mucosa, and mesenteric lymph nodes (MLNs), where they interact with T cells, natural killer (NK) cells, and innate lymphoid cells (ILC), contributing to chronic inflammation. MNPs have been previously investigated at the transcriptomic level in the inflamed gut mucosa, but their molecular characterization at the single-cell level remains uncovered in inflamed MLNs of patients with inflammatory bowel diseases (IBD). Methods MLNs were collected from surgical colonic resections of patients with Crohn’s disease (CD; n=3) or ulcerative colitis (UC; n=3). Cell suspensions were multiplexed and then pooled for sorting CD45+CD3+CD19- T cells and CD45+CD3-CD19- non-T/non-B cells by flow cytometry. Next, sorted cells were combined and labeled with BD Abseq antibodies (antibodies conjugated to oligonucleotide tag). CITE-seq (Cellular Indexing of Transcriptomes and Epitopes by Sequencing), combining simultaneous RNA and protein expression, was performed on the BD RhapsodyTM platform. Results High-quality data from 3308 captured single cells (1471 from CD and 1837 from UC) identified four main immune cell populations (myeloid DCs/Mo/Mac, plasmacytoid DCs, T cells, and NK/innate lymphoid cells). We further segregated cell subsets into 16 MNP, 4 NK/ILC, and 9 T cell clusters. MNP subsets were characterized according to specific gene expression (HLA-DRA, CD1c, ITGAX, SIRPA, JCHAIN, IL3RA). They revealed transcriptionally distinct DC clusters, including one cluster of mature regulatory DC (mregDC) (LAMP3, CCR7), one cluster expressing AXL and THBD, and one cluster of CD103+ DCs expressing LTB, FLT3, and IL22RA2. Further analysis of MNP subsets also revealed 6 clusters of monocytes and macrophages, including inflammatory Mo, Inflammatory Mac, and regulatory Mac. Overall, the proportion of myeloid cells and pDC was higher in UC MLNs when compared to CD (29.6% and 21.6% versus 17.1% and 11.7%, p&lt;0.0001) while the proportion of NK/ILC was higher in CD MLNs (11.7% versus 24.9%, p&lt;0.0001). Comparison of differentially expressed genes (fold-change&gt;1.5) between CD and UC samples showed that CD MLNs were enriched in NK-specific marker genes (KLRD1, IL2RB, NKG7, GZMA). In UC, the majority of upregulated genes related to myeloid gene markers (THBS1, HLA-DQA1, HLA-DRA, VCAN, IL1B, JCHAIN, and CXCL8). Conclusion CITE-Seq analysis of the colonic MLNs of patients with active IBD suggests differences in immune cell landscape gene expression between CD and UC." @default.
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• W4318539401 date "2023-01-30" @default.
• W4318539401 modified "2023-10-16" @default.
• W4318539401 title "P015 CITE-seq analysis revealed immune cell diversity in colonic mesenteric lymph nodes from IBD patients" @default.
• W4318539401 doi "https://doi.org/10.1093/ecco-jcc/jjac190.0145" @default.
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