Roundabout 4 is expressed on hematopoietic stem cells and potentially involved in the niche-mediated regulation of the side population phenotype

Fumi Shibata, Yuko Goto-Koshino, Yoshihiro Morikawa, Tadasuke Komori, Miyuki Ito, Yumi Fukuchi, Jeffrey P. Houchins, Monica Tsang, Dean Y. Li, Toshio Kitamura, Hideaki Nakajima

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Roundabout (Robo) family proteins are immunoglobulin-type cell surface receptors that are expressed predominantly in the nervous system. The fourth member of this family, Robo4, is distinct from the other family members in that it is expressed specifically in endothelial cells. In this study, we examined the expression of Robo4 in hematopoietic stem cells (HSCs) and its possible role in HSC regulation. Robo4 mRNA was specifically expressed in murine HSCs and the immature progenitor cell fraction but not in lineage-positive cells or differentiated progenitors. Moreover, flow cytometry showed a correlation between higher expression of Robo4 and immature phenotypes of hematopoietic cells. Robo4high hematopoietic stem/progenitor cells presented higher clonogenic activity or long-term repopulating activity by colony assays or transplantation assays, respectively. A ligand for Robo4, Slit2, is specifically expressed in bone marrow stromal cells, and its expression was induced in osteoblasts in response to myelosuppressive stress. Interestingly, overexpression of Robo4 or Slit2 in HSCs resulted in their decreased residence in the c-Kit+Sca-1+Lineage--side population fraction. These results indicate that Robo4 is expressed in HSCs, and Robo4/Slit2 signaling may play a role in HSC homeostasis in the bone marrow niche.

Original languageEnglish
Pages (from-to)183-190
Number of pages8
JournalStem Cells
Volume27
Issue number1
DOIs
Publication statusPublished - 2009 Jan

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Hematopoietic Stem Cells
Phenotype
Population
Cell Surface Receptors
Osteoblasts
Mesenchymal Stromal Cells
Nervous System
Immunoglobulins
Flow Cytometry
Homeostasis
Stem Cells
Endothelial Cells
Transplantation
Bone Marrow
Ligands
Messenger RNA

Keywords

  • Hematopoietic stem cell
  • Robo
  • Roundabout
  • Slit
  • Surface marker

ASJC Scopus subject areas

  • Cell Biology
  • Developmental Biology
  • Molecular Medicine

Cite this

Roundabout 4 is expressed on hematopoietic stem cells and potentially involved in the niche-mediated regulation of the side population phenotype. / Shibata, Fumi; Goto-Koshino, Yuko; Morikawa, Yoshihiro; Komori, Tadasuke; Ito, Miyuki; Fukuchi, Yumi; Houchins, Jeffrey P.; Tsang, Monica; Li, Dean Y.; Kitamura, Toshio; Nakajima, Hideaki.

In: Stem Cells, Vol. 27, No. 1, 01.2009, p. 183-190.

Research output: Contribution to journalArticle

Shibata, F, Goto-Koshino, Y, Morikawa, Y, Komori, T, Ito, M, Fukuchi, Y, Houchins, JP, Tsang, M, Li, DY, Kitamura, T & Nakajima, H 2009, 'Roundabout 4 is expressed on hematopoietic stem cells and potentially involved in the niche-mediated regulation of the side population phenotype', Stem Cells, vol. 27, no. 1, pp. 183-190. https://doi.org/10.1634/stemcells.2008-0292
Shibata, Fumi ; Goto-Koshino, Yuko ; Morikawa, Yoshihiro ; Komori, Tadasuke ; Ito, Miyuki ; Fukuchi, Yumi ; Houchins, Jeffrey P. ; Tsang, Monica ; Li, Dean Y. ; Kitamura, Toshio ; Nakajima, Hideaki. / Roundabout 4 is expressed on hematopoietic stem cells and potentially involved in the niche-mediated regulation of the side population phenotype. In: Stem Cells. 2009 ; Vol. 27, No. 1. pp. 183-190.
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