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Dev Cell. 2005 Jun;8(6):907-14.

Quantification of self-renewal capacity in single hematopoietic stem cells from normal and Lnk-deficient mice.

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  • 1Laboratory of Stem Cell Therapy, Center for Experimental Medicine, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan. hema@ims.u-tokyo.ac.jp

Abstract

Despite being a hallmark of hematopoietic stem cells (HSCs), HSC self-renewal has never been quantitatively assessed. Establishment of a clonal and quantitative assay for HSC function permitted demonstration that adult mouse HSCs are significantly heterogeneous in degree of multilineage repopulation and that higher repopulating potential reflects higher self-renewal activity. An HSC with high repopulating potential could regenerate approximately 1000 HSCs, whereas the repopulating activity of regenerated HSCs on average was significantly reduced, indicating extensive but limited self-renewal capacity in HSCs. Comparisons of wild-type mice with mutant mice deficient in the signal adaptor molecule Lnk showed that not only HSC numbers but also the self-renewal capacity of some HSCs are markedly increased when Lnk function is lost. Lnk appears to control HSC numbers by negatively regulating HSC self-renewal signaling.

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