The migration of bone marrow-derived non-hematopoietic tissue-committed stem cells is regulated in an SDF-1-, HGF-, and LIF-dependent manner

• Authors: M. Kucia , W. Wojakowski , R. Reca , B. Machalinski , J. Gozdzik , M. Majka , J. Baran , J. Ratajczak , M.Z. Ratajczak
• Languages of publication: EN

Abstracts

EN

Introduction: Recently we identified in bone marrow (BM) by employing chemotactic isolation to SDF-1 gradient combined with real time RT-PCR analysis a mobile population of CXCR4+ BM mononuclear cells that express mRNA for various markers of early tissue-committed stem cells (TCSCs). In this study we evaluated whether TCSCs respond to other moto-morphogens, such as hepatocyte growth factor (HGF) and leukemia inhibitory factor (LIF). Materials and Methods: We again employed chemotactic isolation combined with real-time RT-PCR analysis to assess whether murine and human BM contain TCSCs that respond to HGF and LIF gradients. We also evaluated expressions of HGF and LIF in damaged organs. Results: We noted that the number of TCSCs is highest in BM from young (1- to 2-month-old) mice and decreases in 1-year-old animals. Murine and human TCSCs 1) respond to HGF and LIF gradients in addition to an SDF-1 gradient, 2) reside in populations of BM-derived non-hematopoietic CD45? cells, and 3) are released (mobilized) from BM into the peripheral blood (PB) during tissue injury (e.g. after partial body irradiation). Conclusions: These findings further support our theory of the BM as a ?hideout' for TCSCs and we suggest that their presence in BM tissue should be considered before experimental evidence is interpreted simply as transdifferentiation/plasticity of hematopoietic stem cells. Since we demonstrated that not only SDF-1, but also HGF and LIF are upregulated in damaged tissues, we postulate that CXCR4+ c-Met+ LIF-R+ TCSC could be mobilized from the BM into the PB, from which they are subsequently chemoattracted to damaged organs, where they play a role in tissue repair/regeneration.

Keywords

EN

MOBILIZATION; PLASTICITY; REGENERATION; STEM CELL

Discipline

• IMMUNOLOGY: IMMUNOLOGY

• Publisher: Ludwik Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences
• Journal: Archivum Immunologiae et Therapiae Experimentalis
• Year: 2006
• Volume: 54
• Issue: 2
• Pages: 121-135

Contributors

author

M. Kucia

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W. Wojakowski

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R. Reca

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B. Machalinski

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J. Gozdzik

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M. Majka

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J. Baran

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J. Ratajczak

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M.Z. Ratajczak

• Document Type: ARTICLE
• Publication order reference: Magda Kucia, Stem Cell Biology Program at James Graham Brown Cancer Center and Department of Medicine, University of Louisville, Louisville, USA