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Stromal stem cells: marrow-derived osteogenic precursors.

M Owen1, A J Friedenstein

  • 1Nuffield Department of Orthopaedic Surgery, University of Oxford, UK.

Ciba Foundation Symposium
|January 1, 1988
PubMed
Summary

Stromal stem cells in bone and marrow tissues can form various cell lines, including osteogenic cells. These cells, identified as colony-forming unit fibroblastic (CFU-F), show diverse self-renewal and differentiation potentials.

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Area of Science:

  • Stem cell biology
  • Connective tissue research
  • Osteogenesis studies

Background:

  • Stromal stem cells reside in soft connective tissues adjacent to bone and marrow.
  • These cells are hypothesized to differentiate into multiple cell lineages, including osteogenic cells.
  • Fibroblastic colonies, derived from colony-forming unit fibroblastic (CFU-F), form when marrow cells are cultured in vitro.

Purpose of the Study:

  • To discuss evidence supporting the presence and multipotentiality of stromal stem cells.
  • To investigate the heterogeneity and differentiation capabilities of CFU-F.
  • To explore factors influencing osteogenesis and stromal cell line promotion.

Main Methods:

  • In vitro culture of marrow cells to form fibroblastic colonies (CFU-F).
  • In vivo assays to assess CFU-F self-renewal and multipotentiality.
  • In vitro studies to examine CFU-F heterogeneity and differentiation modulation by medium factors.

Main Results:

  • CFU-F populations are heterogeneous, containing stem and progenitor cells with varying self-renewal and differentiation potentials.
  • In vitro differentiation of CFU-F can be modified by culture conditions and added factors, promoting osteogenesis.
  • Different stromal cell lines can be promoted under specific culture conditions.

Conclusions:

  • Evidence supports the existence of multipotent stromal stem cells in bone and marrow-associated connective tissues.
  • CFU-F represent a heterogeneous population whose differentiation is amenable to experimental manipulation.
  • Further research with specific markers is needed to fully elucidate the stromal fibroblastic system's cell hierarchy.

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