期刊
JOURNAL OF LEUKOCYTE BIOLOGY
卷 105, 期 6, 页码 1111-1121出版社
WILEY
DOI: 10.1002/JLB.MR0718-261RR
关键词
inflammation; IL-1; lung; microparticle; platelets
资金
- Arthritis National Research Foundation
- JBC Microgrant from the Joint Biology Consortium [P30 AR070253]
- NIH [P30 AR070253, R01 AR065538]
- Fundacion Bechara
Platelets play well-recognized roles in inflammation, but their cell of origin-the megakaryocyte-is not typically considered an immune lineage. Megakaryocytes are large polyploid cells most commonly identified in bone marrow. Egress via sinusoids enables migration to the pulmonary capillary bed, where elaboration of platelets can continue. Beyond receptors involved in hemostasis and thrombosis, megakaryocytes express receptors that confer immune sensing capacity, including TLRs and Fc-gamma receptors. They control the proliferation of hematopoietic cells, facilitate neutrophil egress from marrow, possess the capacity to cross-present antigen, and can promote systemic inflammation through microparticles rich in IL-1. Megakaryocytes internalize other hematopoietic lineages, especially neutrophils, in an intriguing cell-in-cell interaction termed emperipolesis. Together, these observations implicate megakaryocytes as direct participants in inflammation and immunity.
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