Abstract
Extramedullary hematopoiesis (EMH) is the expansion and differentiation of hematopoietic stem and progenitor cells outside of the bone marrow. In postnatal life, as a compensatory mechanism for ineffective hematopoiesis of the bone marrow, pathological EMH is triggered by hematopoietic disorders, insufficient hematopoietic compensation, and other pathological stress conditions, such as infection, advanced tumors, anemia, and metabolic stress. Pathological EMH has been reported in many organs, and the sites of pathological EMH may be related to reactivation of the embryonic hematopoietic structure in these organs. As a double-edged sword (blood and immune cell supplementation as well as clinical complications), pathological EMH has been widely studied in recent years. In particular, pathological EMH induced by late-stage tumors contributes to tumor immunosuppression. Thus, a deeper understanding of the mechanism of pathological EMH may be conducive to the development of therapies against the pathological processes that induce EMH. This article reviews the recent progress of research on the cellular and molecular mechanisms of pathological EMH in specific diseases.
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Abbreviations
- 27HC:
-
27-Hydroxycholesterol
- AML:
-
Acute myeloid leukemia
- ASXL:
-
ASXL transcriptional regulator 2
- CLP:
-
Common lymphoid progenitor
- CMP:
-
Common myeloid progenitor
- CMRPs:
-
Common myeloid repopulating progenitors
- EIs:
-
Erythroblastic islands
- EPCs:
-
Erythroid progenitor cells
- EPO:
-
Erythropoietin
- ERα:
-
Estrogen receptor α
- G-CSF:
-
Granulocyte-colony stimulating factor
- GM-CSF:
-
Granulocyte–macrophage colony stimulating factor
- GMP:
-
Granulocyte–macrophage progenitor
- HCC:
-
Hepatocellular carcinoma
- HCMV:
-
Human cytomegalovirus
- HPCs:
-
Hematopoietic progenitor cells
- HSCs:
-
Hematopoietic stem cells
- HSPCs:
-
Hematopoietic stem and progenitor cells
- IFN-γ:
-
Interferon-γ
- JAK2:
-
Janus kinase-2
- LDL:
-
Low density lipoprotein
- LepR:
-
Leptin receptor
- MCMV:
-
Murine cytomegalovirus
- M-CSF:
-
Macrophage-colony stimulating factor
- MDSCs:
-
Myeloid-derived suppressor cells
- MEP:
-
Megakaryocyte–erythrocyte progenitor
- MERPs:
-
Megakaryocyte–erythrocyte repopulating progenitors
- MkRPs:
-
Megakaryocyte repopulating progenitors
- MRI:
-
Magnetic resonance imaging
- MyRP:
-
Myeloid-restricted repopulating progenitor
- NK:
-
Natural killer
- PAMPs:
-
Pathogen-associated molecular patterns
- Rheb1:
-
Ras homolog enriched in brain 1
- ROS:
-
Reactive oxygen species
- Setd1b:
-
SET domain containing 1B, histone lysine methyltransferase
- Srebp2:
-
Sterol regulatory element binding transcription factor 2
- TLRs:
-
Toll-like receptors
- Treg:
-
Regulatory T
- VCAM-1:
-
Vascular cell adhesion molecule-1
- VLA-4:
-
Very late antigen-4
- Zeb2:
-
Zinc finger E-box binding homeobox 2
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This work is supported by the National Natural Science Foundation of China (Grant Nos. 81925030, 81972699, 81620108023 and 81472648).
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Yang, X., Chen, D., Long, H. et al. The mechanisms of pathological extramedullary hematopoiesis in diseases. Cell. Mol. Life Sci. 77, 2723–2738 (2020). https://doi.org/10.1007/s00018-020-03450-w
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DOI: https://doi.org/10.1007/s00018-020-03450-w