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The bone marrow microenvironment at single-cell resolution.

Anastasia N Tikhonova1,2, Igor Dolgalev3,4,5, Hai Hu3,4

  • 1Department of Pathology, NYU School of Medicine, New York, NY, USA. Anastasia.Tikhonova@nyumc.org.

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|April 12, 2019
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Summary
This summary is machine-generated.

This study maps mouse bone marrow cells at single-cell resolution, revealing complex cellular interactions that regulate blood cell formation (hematopoiesis). Stress significantly alters this microenvironment, impacting stem cell development.

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Area of Science:

  • Hematology
  • Stem Cell Biology
  • Molecular Biology

Background:

  • The bone marrow microenvironment is crucial for regulating hematopoiesis, but its molecular complexity and response to stress remain poorly understood.
  • Understanding the cellular and molecular dynamics of the bone marrow niche is essential for deciphering blood cell formation processes.

Purpose of the Study:

  • To map the transcriptional landscape of mouse bone marrow vascular, perivascular, and osteoblast cell populations at single-cell resolution.
  • To investigate how these cell populations respond transcriptionally to homeostasis and stress-induced hematopoiesis.
  • To identify cellular sources of key regulatory factors and understand their role in hematopoiesis.

Main Methods:

  • Single-cell RNA sequencing (scRNA-seq) was employed to analyze transcriptional profiles.
  • Comparative analysis was performed on bone marrow cells under homeostatic and stress conditions.
  • Focus on vascular, perivascular, and osteoblast cell populations within the bone marrow niche.

Main Results:

  • Revealed significant cellular heterogeneity within the bone marrow niche.
  • Identified specific cell populations as sources of pro-hematopoietic factors.
  • Demonstrated substantial transcriptional remodeling of niche elements under stress, including adipocytic skewing of perivascular cells.
  • Observed downregulation of vascular Notch delta-like ligands (Dll1 and Dll4) under stress.
  • Found that absence of vascular Dll4 led to premature myeloid differentiation in hematopoietic stem cells.

Conclusions:

  • Refined understanding of the cellular architecture and molecular landscape of the bone marrow niche.
  • Highlighted the dynamic and heterogeneous nature of the niche, which is sensitive to stress.
  • Illustrated the utility of single-cell transcriptomics in dissecting the regulation of hematopoiesis by discrete niche populations.