Niche-to-niche Migration of Bone-Marrow-Derived Cells

Trends Mol Med. 2007 Feb;13(2):72-81. doi: 10.1016/j.molmed.2006.12.003. Epub 2007 Jan 2.

Abstract

During ontogenesis, haematopoietic stem cells (HSCs) relocate between extra-embryonic and embryonic compartments. Similarly, site-specific homing of HSCs is ongoing during adulthood. With the expanding knowledge of HSC physiology, a new paradigm emerges in which HSCs and haematopoietic progenitor cells (HPCs) migrate to defined microenvironments within the bone marrow (BM) and to 'activated' or 'inducible' niches elsewhere. Here, we summarize current understanding of HSC niche characteristics, and the physiological and pathological mechanisms that guide HSC homing both within the BM and to distant niches in the periphery, promoting new vessel growth in tumours and ischaemia. Recent observations suggest that features of the HSC niche might also be recapitulated in pre-metastatic sites. Clusters of BM-derived HPCs promote invasion of disseminating cancer cells. Clear clinical benefits can be foreseen by modulating HSCs and their microenvironments, in promoting tissue regeneration, and inhibiting tumourigenesis and cancer metastasis.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't
  • Review

MeSH terms

  • Animals
  • Blood Vessels / cytology
  • Bone Marrow Cells / cytology
  • Bone Marrow Cells / physiology*
  • Cell Adhesion
  • Cell Movement / physiology*
  • Chemokine CXCL12
  • Chemokines, CXC / physiology
  • Fetal Development
  • Hematopoiesis
  • Hematopoietic Stem Cells / cytology
  • Hematopoietic Stem Cells / physiology
  • Humans
  • Models, Biological
  • Neoplasms / blood supply
  • Neoplasms / pathology
  • Neoplastic Stem Cells / pathology
  • Osteoblasts / cytology
  • Osteoblasts / physiology
  • Receptors, Calcium-Sensing / physiology
  • Signal Transduction

Substances

  • CXCL12 protein, human
  • Chemokine CXCL12
  • Chemokines, CXC
  • Receptors, Calcium-Sensing