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Stem Cell Procurement

Side population/ABCG2-positive cells represent a heterogeneous group of haemopoietic cells: implications for the use of adult stem cells in transplantation and plasticity protocols

Bone Marrow Transplantation volume 35, pages 353–360 (2005)Cite this article

Summary:

Murine side population (SP) cells may have an increased ability to engraft lethally irradiated mice and lack CD34 expression. Strategies using CD34 as a primary marker of haemopoietic stem cells may therefore result in the exclusion of a primitive stem cell population. The molecular basis for the murine SP phenotype has been attributed to the multidrug-resistance transporter ABCG2. This study aimed to investigate ABCG2 expression from a variety of human sources and investigate the relationship between ABCG2 expression, the SP phenotype, and expression of markers such as CD34 and CD133. SP cells were observed in different haemopoietic sources, but a significant increase in the number of SP cells was observed in PB following granulocyte colony-stimulating factor mobilisation. No direct correlation between the frequency of SP cells and the expression of ABCG2 was observed. SP cells were identified in both lineage-positive and lineage-negative population and ABCG2 expression was enriched in lineage-negative SP cells. Lineage-negative SP cells were devoid of CD34 expression but enriched for CD133. Subsequent analysis revealed that ABCG2 and CD133 are coexpressed. Together, these data suggest that the ABCG2 transporter is neither required nor responsible for the SP phenotpye in many human blood cells.

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Acknowledgements

We thank Jon Murray, Angela Good and Rita Angelica, the Transplant Co-ordinators from the Adult Leukaemia Unit, Christie Hospital NHS Trust, Manchester. Umbilical Cord Blood was obtained with the kind assistance of staff at Manchester Royal Infirmary, Bolton Royal Infirmary, Victoria Royal Infirmary, Newcastle upon Tyne and Southmead Hospital, Bristol. Finally, We thank Mike Hughes and Jeff Barry, Paterson Institute for Cancer Research, for help with flow cytometry.

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  1. Stem Cell and Leukamia Biology Group, and Paterson Institute for Cancer Research, Manchester, UK

    C S Naylor, E Jaworska, K Branson & R Chopra

  2. Department of Medical Oncology, University of Manchester School of Cancer Studies, Manchester, UK

    M J Embleton & R Chopra

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  1. C S Naylor
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  2. E Jaworska
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Correspondence to R Chopra.

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Naylor, C., Jaworska, E., Branson, K. et al. Side population/ABCG2-positive cells represent a heterogeneous group of haemopoietic cells: implications for the use of adult stem cells in transplantation and plasticity protocols. Bone Marrow Transplant 35, 353–360 (2005). https://doi.org/10.1038/sj.bmt.1704762

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