Abstract:
:Aging results in increased myelopoiesis, which is linked to the increased incidence of myeloid leukemias and production of myeloid-derived suppressor cells. Here, we examined the contribution of plasma cells (PCs) to age-related increases in myelopoiesis, as PCs exhibit immune regulatory function and sequester in bone marrow (BM). PC number was increased in old BM, and they exhibited high expression of genes encoding inflammatory cytokines and pathogen sensors. Antibody-mediated depletion of PCs from old mice reduced the number of myeloid-biased hematopoietic stem cells and mature myeloid cells to levels in young animals, but lymphopoiesis was not rejuvenated, indicating that redundant mechanisms inhibit that process. PCs also regulated the production of inflammatory factors from BM stromal cells, and disruption of the PC-stromal cell circuitry with inhibitors of the cytokines IL-1 and TNF-α attenuated myelopoiesis in old mice. Thus, the age-related increase in myelopoiesis is driven by an inflammatory network orchestrated by PCs.
journal_name
Immunityjournal_title
Immunityauthors
Pioli PD,Casero D,Montecino-Rodriguez E,Morrison SL,Dorshkind Kdoi
10.1016/j.immuni.2019.06.006subject
Has Abstractpub_date
2019-08-20 00:00:00pages
351-366.e6issue
2eissn
1074-7613issn
1097-4180pii
S1074-7613(19)30276-6journal_volume
51pub_type
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