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A bone marrow niche-derived molecular switch between osteogenesis and hematopoiesis
Marta Galán-Díez1, Stavroula Kousteni1
1Department of Physiology and Cellular Biophysics, College of Physicians and Surgeons, Columbia University, New York, New York 10032, USA.
Genes & Development
|March 30, 2018
Summary
Early B-cell factor 3 (Ebf3) maintains hematopoietic stem cell (HSC) niches by preventing osteoblast differentiation in bone marrow. Loss of Ebf3 impairs HSC numbers and causes osteosclerosis.
Area of Science:
- Hematology
- Stem Cell Biology
- Bone Biology
Background:
- Hematopoietic stem cells (HSCs) are maintained in specialized bone marrow niches.
- Leptin receptor (LepR)-expressing CXC chemokine ligand 12 (CXCL12)-abundant reticular (CAR) cells form HSC niches and differentiate into osteoblasts.
- The inverse regulation of these CAR cell functions is crucial for HSC maintenance but not fully understood.
Purpose of the Study:
- To investigate the transcriptional regulation of CAR cell differentiation and its impact on HSC maintenance.
- To identify factors involved in preventing osteogenesis within HSC niches.
Main Methods:
- Utilized conditional knockout mouse models to delete Ebf3 in CAR cells.
- Employed retroviral systems to manipulate Ebf3 expression.
- Analyzed HSC numbers and bone marrow osteogenesis.
Main Results:
- Early B-cell factor 3 (Ebf3) is preferentially expressed in CAR/LepR+ cells.
- Ebf3 inhibits CAR cell differentiation into osteoblasts and promotes their self-renewal.
- Loss of Ebf3 in CAR cells resulted in impaired HSC numbers and osteosclerosis.
Conclusions:
- Ebf3 acts as a critical transcription factor in CAR cells, balancing osteogenesis and hematopoiesis.
- Ebf3 is essential for maintaining HSC numbers by regulating the niche microenvironment.
- This study identifies Ebf3 as a key niche factor regulating the interplay between bone formation and blood cell production.
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