Lack of Evidence that Hematopoietic Stem Cells Depend on N-Cadherin-Mediated Adhesion to Osteoblasts for Their Maintenance

Mark J. Kiel, Glenn L. Radice, Sean J. Morrison

Research output: Contribution to journalArticle

223 Scopus citations

Abstract

Recent studies have proposed that bone marrow hematopoietic stem cells (HSCs) are maintained via N-cadherin-mediated homophilic adhesion with osteoblasts. However, there is not yet any evidence that N-cadherin-expressing cells have HSC activity or that osteoblasts are required for HSC maintenance. We were unable to detect N-cadherin expression in highly purified HSCs by polymerase chain reaction, by using commercial anti-N-cadherin antibodies, or by β-galactosidase staining of N-cadherin gene trap mice. Only N-cadherin-negative bone marrow cells exhibited HSC activity in irradiated mice. Finally, biglycan-deficient mice had significant reductions in trabecular bone and osteoblasts but showed no defects in hematopoiesis, HSC frequency, or function. Thus, reductions in osteoblasts do not necessarily lead to reductions in HSCs. Most bone marrow HSCs in wild-type and biglycan-deficient mice localized to sinusoids, and few localized within five cell diameters of the endosteum. These results question whether significant numbers of HSCs depend on N-cadherin-mediated adhesion to osteoblasts.

Original languageEnglish (US)
Pages (from-to)204-217
Number of pages14
JournalCell Stem Cell
Volume1
Issue number2
DOIs
StatePublished - Aug 16 2007

Keywords

  • STEMCELL

ASJC Scopus subject areas

  • Molecular Medicine
  • Genetics
  • Cell Biology

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