Cited by 111Hematopoietic Stem Cell TransplantationBlood disorders and treatmentsCytokine Signaling Pathways and Interactions

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Inflammatory signaling regulates hematopoietic stem and progenitor cell development and homeostasis

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Collins, Amélie, Mitchell, Carl A., Passegué, Emmanuelle·2021·Journal of Experimental Medicine

Abstract

Inflammation exerts multiple effects on the early hematopoietic compartment. Best studied is the role of proinflammatory cytokines in activating adult hematopoietic stem and progenitor cells to dynamically replenish myeloid lineage cells in a process known as emergency myelopoiesis. However, it is increasingly appreciated that the same proinflammatory signaling pathways are used in diverse hematopoietic scenarios. This review focuses on inflammatory signaling in the emergence of the definitive hematopoietic compartment during embryonic life, and tonic inflammatory signals derived from commensal microbiota in shaping the adult hematopoietic compartment in the absence of pathogenic insults. Insights into the unique and shared aspects of inflammatory signaling that regulate hematopoietic stem and progenitor cell function across the lifespan and health span of an individual will enable better diagnostic and therapeutic approaches to hematopoietic dysregulation and malignancies.

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Crossref · 10.1084/jem.20201545

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Figures

Figure 1. Tonic inflammatory signaling in the establishment of definitive hematopoiesis. The development of HSCs involves three distinct steps. (1) Hemogenic endothelial cells respond to inflammatory signals secreted by primitive myeloid cells that converge on NF-κB to up-regulate Notch ligand. (2) Neighboring endothelial cells expressing Notch are stimulated to up-regulate a number of target genes required for HSC emergence; this signal is relayed in part through inflammatory pathways. (3) Mobilization of newly specified HSCs from the AGM into the circulation, migration to subsequent hematopoietic organs, and further functional maturation is regulated by cytokines. EMP, erythroid-myeloid progenitor; Mϕ, macrophage; Neu, neutrophil.
Figure 1. Tonic inflammatory signaling in the establishment of definitive hematopoiesis. The development of HSCs involves three distinct steps. (1) Hemogenic endothelial cells respond to inflammatory signals secreted by primitive myeloid cells that converge on NF-κB to up-regulate Notch ligand. (2) Neighboring endothelial cells expressing Notch are stimulated to up-regulate a number of target genes required for HSC emergence; this signal is relayed in part through inflammatory pathways. (3) Mobilization of newly specified HSCs from the AGM into the circulation, migration to subsequent hematopoietic organs, and further functional maturation is regulated by cytokines. EMP, erythroid-myeloid progenitor; Mϕ, macrophage; Neu, neutrophil.CC BY-NC-SA · PubMed Central
Figure 2. Intestinal commensal microbes shape the hematopoietic compartment through systemic and niche effects. Commensal bacteria exert effects on type 3 innate lymphoid cells (ILC3s) within the intestinal lamina propria to produce IL17A, which stimulates circulating levels of G-CSF and acts distally on GMPs in the BM cavity. The intestinal microbiome also exerts distant effects on HSPCs by releasing bacterial products such as Nod1L that interact with the Nod1 receptor expressed on marrow MSCs and extracellular vesicles containing bacterial DNA that are taken up by Cx3cr1+ MNCs to stimulate the production of a whole range of cytokines that act locally within the BM microenvironment. The source of most of those circulating cytokines remains under investigation.
Figure 2. Intestinal commensal microbes shape the hematopoietic compartment through systemic and niche effects. Commensal bacteria exert effects on type 3 innate lymphoid cells (ILC3s) within the intestinal lamina propria to produce IL17A, which stimulates circulating levels of G-CSF and acts distally on GMPs in the BM cavity. The intestinal microbiome also exerts distant effects on HSPCs by releasing bacterial products such as Nod1L that interact with the Nod1 receptor expressed on marrow MSCs and extracellular vesicles containing bacterial DNA that are taken up by Cx3cr1+ MNCs to stimulate the production of a whole range of cytokines that act locally within the BM microenvironment. The source of most of those circulating cytokines remains under investigation.CC BY-NC-SA · PubMed Central

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Metadata

Authors
Collins, A., Mitchell, C. A., & Passegué, E.
Affiliations
  • Columbia University Irving Medical Center (US)
  • Columbia Stem Cell Initiative, Columbia University Irving Medical Center, New York, NY 1
Corresponding author
Collins, Amélie
Venue
Journal of Experimental Medicine
Published
2021-06-15
Volume
218
Issue
7
ISSN
  • 0022-1007 (ISSN-L)
  • 1540-9538
OpenAlex
W3168900950
Cited by
111
References
118
Citations by year
2026: 24 · 2025: 24 · 2024: 32 · 2023: 22 · 2022: 8 · 2021: 1
FWCI
2.75
Type
journal article
Language
en
Open access
Locations
  • The Journal of Experimental Medicine (publishedVersion, cc-by-nc-sa)
  • PubMed Central (publishedVersion, cc-by-nc-sa)
  • PubMed (publishedVersion)
Funders
  • National Institute of Diabetes and Digestive and Kidney Diseases (K08-DK124657)
  • Louis V. Gerstner Jr. Scholar Award
  • National Institutes of Health
  • National Heart, Lung, and Blood Institute (R35-HL135763)
Topics
  • Health Sciences › Medicine › Hematology › Hematopoietic Stem Cell Transplantation
  • Health Sciences › Medicine › Hematology › Blood disorders and treatments
  • Life Sciences › Immunology and Microbiology › Immunology › Cytokine Signaling Pathways and Interactions
Keywords
inflammatory signaling, hematopoietic stem and progenitor cells, emergency myelopoiesis, inflammatory cytokines, definitive hematopoiesis, embryonic hematopoiesis, commensal microbiota, hematopoietic homeostasis, myeloid lineage, hematologic malignancies
MeSH terms
Animals, Hematopoiesis, Hematopoietic Stem Cells, Homeostasis, Humans, Inflammation, Stem Cells, Signal Transduction, Myeloid Cells, Myelopoiesis

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