免疫系统
生物
免疫学
先天免疫系统
干细胞
造血
髓样
巨核细胞
人口
炎症
脾脏
骨髓
祖细胞
细胞生物学
微生物学
医学
环境卫生
作者
Jin Wang,Jiayi Xie,Daosong Wang,Xue Han,Minqi Chen,Guojun Shi,Linjia Jiang,Meng Zhao
标识
DOI:10.1101/2021.06.09.447810
摘要
Abstract Megakaryocytes (MKs) continuously produce platelets to support hemostasis and form a niche for hematopoietic stem cell maintenance in the bone marrow. MKs are also involved in inflammation responses; however, the mechanism remains poorly understood. Here, using single-cell sequencing we identified an MK-derived immune-stimulating cell (MDIC) population exhibiting both MK-specific and immune characteristics, which highly expresses CXCR4 and immune response genes to participate in host-protective response against bacteria. MDICs interact with myeloid cells to promote their migration and stimulate the bacterial phagocytosis of macrophages and neutrophils by producing TNFα and IL-6. CXCR4 high MDICs egress circulation and infiltrate into the spleen, liver, and lung upon bacterial infection. Ablation of MKs suppresses the innate immune response and T cell activation to impair the anti-bacterial effects in mice under the Listeria monocytogenes challenge. Using hematopoietic stem/progenitor cell lineage-tracing mouse line, we show that MDICs are generated from infection-induced emergency megakaryopoiesis in response to bacterial infection. Overall, we identify MDICs as an MK subpopulation, which regulates host-defense immune response against bacterial infection.
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