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Stem Cells Vol. 24 No. 1 January 2006, pp. 3 -12
doi:10.1634/stemcells.2005-0116; www.StemCells.com
© 2006 AlphaMed Press

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TISSUE-SPECIFIC STEM CELLS-CONCISE REVIEW

A Side Order of Stem Cells: The SP Phenotype

Grant A. Challen, Melissa H. Little

Institute for Molecular Bioscience, The University of Queensland, Brisbane, Australia

Key Words. Side population • Hoechst 33342 • Stem cell • Phenotype • Dye efflux

Correspondence: Melissa H. Little, Ph.D., Institute for Molecular Bioscience, Queensland Bioscience Precinct, 306 Carmody Road, The University of Queensland, St. Lucia, Brisbane, QLD, 4072, Australia. Telephone: 61-7-3346-2054; fax: 61-7-3346-2101; e-mail: M.Little{at}imb.uq.edu.au

A defining property of murine hematopoietic stem cells (HSCs) is low fluorescence after staining with Hoechst 33342 and Rhodamine 123. These dyes have proven to be remarkably powerful tools in the purification and characterization of HSCs when used alone or in combination with antibodies directed against stem cell epitopes. Hoechst low cells are described as side population (SP) cells by virtue of their typical profiles in Hoechst red versus Hoechst blue bivariate fluorescent-activated cell sorting dot plots. Recently, excitement has been generated by the findings that putative stem cells from solid tissues may also possess this SP phenotype. SP cells have now been isolated from a wide variety of mammalian tissues based on this same dye efflux phenomenon, and in many cases this cell population has been shown to contain apparently multipotent stem cells. What is yet to be clearly addressed is whether cell fusion accounts for this perceived SP multipotency. Indeed, if low fluorescence after Hoechst staining is a phenotype shared by hematopoietic and organ-specific stem cells, do all resident tissue SP cells have bone marrow origins or might the SP phenotype be a property common to all stem cells? Subject to further analysis, the SP phenotype may prove invaluable for the initial isolation of resident tissue stem cells in the absence of definitive cell-surface markers and may have broad-ranging applications in stem cell biology, from the purification of novel stem cell populations to the development of autologous stem cell therapies.




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