Bacteria-Induced Acute Inflammation Does Not Reduce the Long-Term Reconstitution Capacity of Bone Marrow Hematopoietic Stem Cells

Pathogen-initiated chronic inflammation or autoimmune diseases accelerate proliferation and promote differentiation of hematopoietic stem cells (HSCs) but simultaneously reduce reconstitution capacity. Nevertheless, the effect of acute infection and inflammation on functional HSCs is still largely u...

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Bibliographic Details
Published in:Frontiers in immunology 2020-04, Vol.11, p.626-626
Main Authors: Zhang, Xiaoyu, Karatepe, Kutay, Chiewchengchol, Direkrit, Zhu, Haiyan, Guo, Rongxia, Liu, Peng, Yu, Hongbo, Ren, Qian, Luo, Xiao, Cheng, Tao, Ma, Fengxia, Xu, Yuanfu, Han, Mingzhe, Luo, Hongbo R
Format: Article
Language:English
Subjects:
Acute Disease
acute infection
Animals
Bone Marrow Cells - physiology
Cell Differentiation
Cell Self Renewal
Cells, Cultured
Escherichia coli - physiology
Escherichia coli Infections - immunology
Hematopoietic Stem Cell Transplantation
hematopoietic stem cells
Hematopoietic Stem Cells - physiology
Humans
Immunology
inflammation
Inflammation - immunology
long-term reconstitution
Mice
Mice, Inbred C57BL
self-renewal
Transplantation Chimera
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Summary:Pathogen-initiated chronic inflammation or autoimmune diseases accelerate proliferation and promote differentiation of hematopoietic stem cells (HSCs) but simultaneously reduce reconstitution capacity. Nevertheless, the effect of acute infection and inflammation on functional HSCs is still largely unknown. Here we found that acute infection elicited by heat-inactivated (HIEC) expanded bone marrow lineage-negative (Lin) stem-cell antigen 1 (Sca-1) cKit (LSK) cell population, leading to reduced frequency of functional HSCs in LSK population. However, the total number of BM phenotypic HSCs (Flk2 CD48 CD150 LSK cells) was not altered in HIEC-challenged mice. Additionally, the reconstitution capacity of the total BM between infected and uninfected mice was similar by both the competitive repopulation assay and measurement of functional HSCs by limiting dilution. Thus, occasionally occurring acute inflammation, which is critical for host defenses, is unlikely to affect HSC self-renewal and maintenance of long-term reconstitution capacity. During acute bacterial infection and inflammation, the hematopoietic system can replenish hematopoietic cells consumed in the innate inflammatory response by accelerating hematopoietic stem and progenitor cell proliferation, but preserving functional HSCs in the BM.
ISSN:1664-3224
1664-3224
DOI:10.3389/fimmu.2020.00626