Recruitment of stem and progenitor cells from the bone marrow niche requires MMP-9 mediated release of Kit-ligand Academic Article uri icon


MeSH Major

  • Acquired Immunodeficiency Syndrome
  • Brain Neoplasms
  • Lymphoma


  • Stem cells within the bone marrow (BM) exist in a quiescent state or are instructed to differentiate and mobilize to circulation following specific signals. Matrix metalloproteinase-9 (MMP-9), induced in BM cells, releases soluble Kit-ligand (sKitL), permitting the transfer of endothelial and hematopoietic stem cells (HSCs) from the quiescent to proliferative niche. BM ablation induces SDF-1, which upregulates MMP-9 expression, and causes shedding of sKitL and recruitment of c-Kit+ stem/progenitors. In MMP-9-/- mice, release of sKitL and HSC motility are impaired, resulting in failure of hematopoietic recovery and increased mortality, while exogenous sKitL restores hematopoiesis and survival after BM ablation. Release of sKitL by MMP-9 enables BM repopulating cells to translocate to a permissive vascular niche favoring differentiation and reconstitution of the stem/progenitor cell pool.

publication date

  • May 31, 2002



  • Academic Article


Digital Object Identifier (DOI)

  • 10.1016/S0092-8674(02)00754-7

Additional Document Info

start page

  • 625

end page

  • 37


  • 109


  • 5