Lineage-Biased Hematopoietic Stem Cells Are Regulated by Distinct Niches

Sandra Pinho, Tony Marchand, Eva Yang, Qiaozhi Wei, Claus Nerlov, Paul S. Frenette

Research output: Contribution to journalArticle

46 Scopus citations

Abstract

The spatial localization of hematopoietic stem cells (HSCs) in the bone marrow (BM) remains controversial, with some studies suggesting that they are maintained in homogeneously distributed niches while others have suggested the contributions of distinct niche structures. Subsets of quiescent HSCs have been reported to associate with megakaryocytes (MK) or arterioles in the BM. However, these HSC subsets have not been prospectively defined. Here, we show that platelet and myeloid-biased HSCs, marked by von Willebrand factor (vWF) expression, are highly enriched in MK niches. Depletion of MK selectively expands vWF+ HSCs, whereas the depletion of NG2+ arteriolar niche cells selectively depletes vWF lymphoid-biased HSCs. In addition, MK depletion compromises vWF+ HSC function by reducing their long-term self-renewal capacity and eliminating their lineage bias after transplantation. These studies demonstrate the existence of two spatially and functionally separate BM niches for HSC subsets with distinct developmental potential. Pinho et al. show that myeloid- and lymphoid-biased HSCs are located in, and regulated by, separate bone marrow niches occupied by megakaryocytes (MK) and arterioles, respectively. MK niches may also regulate HSC fate since MK deletion reprograms myeloid-biased HSCs to balanced-lineage contributions.

Original languageEnglish (US)
Pages (from-to)634-641.e4
JournalDevelopmental cell
Volume44
Issue number5
DOIs
StatePublished - Mar 12 2018

Keywords

  • arteriolar niche
  • hematopoietic stem cell
  • hematopoietic stem cell niche
  • lineage bias
  • megakaryocyte niche
  • von Willebrand factor

ASJC Scopus subject areas

  • Molecular Biology
  • Biochemistry, Genetics and Molecular Biology(all)
  • Developmental Biology
  • Cell Biology

Fingerprint Dive into the research topics of 'Lineage-Biased Hematopoietic Stem Cells Are Regulated by Distinct Niches'. Together they form a unique fingerprint.

  • Cite this