Evidence for a qualitative hierarchy within the Hoechst-33342 'side population' (SP) of murine bone marrow cells

S. N. Robinson, S. M. Seina, J. C. Gohr, C. A. Kuszynski, J. G. Sharp

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


In vitro cobblestone area (CA)-forming cell (CAFC) and in vivo (short-term and competitive repopulation) assays demonstrate that a qualitative hierarchy exists within the Hoechst-33342-defined side population (SP) in murine bone marrow (BM). Consistent with and extending previous studies, we demonstrate that (i) hematopoietic activity found in whole BM (WBM) is concentrated within the SP, rather than the non-SP (NSP); and (ii) within the SP, those cells that more strongly efflux the dye (lower SP, LSP) are qualitatively different from those that less strongly efflux the dye (upper SP, USP). Qualitative differences are highlighted by evidence that (i) CA derived from LSP CAFC persist in culture significantly longer than CA derived from USP CAFC; (ii) short-term, multilineage repopulation of lethally irradiated mice by LSP cells is more rapid than that in mice receiving USP, NSP, whole SP (WSP), or WBM cells and (iii) LSP cells out-compete USP cells in the multilineage hematopoietic repopulation of lethally irradiated recipients. These data suggest that LSP cells are of higher quality than USP cells and potentially provide a means by which qualitative changes in primitive hematopoietic progenitors occurring naturally with aging, or clinically as a consequence of therapeutic manipulation, can be assessed.

Original languageEnglish (US)
Pages (from-to)807-818
Number of pages12
JournalBone marrow transplantation
Issue number8
StatePublished - Apr 2005


  • CAFC assay
  • Competitive repopulation
  • Hematopoietic reconstitution
  • Primitive hematopoietic progenitor cell
  • Qualitative hierarchy
  • Side population (SP)

ASJC Scopus subject areas

  • Hematology
  • Transplantation


Dive into the research topics of 'Evidence for a qualitative hierarchy within the Hoechst-33342 'side population' (SP) of murine bone marrow cells'. Together they form a unique fingerprint.

Cite this