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Related Experiment Videos

Bone morphogenetic proteins regulate the developmental program of human hematopoietic stem cells.

M Bhatia1, D Bonnet, D Wu

  • 1Department of Gene Therapy and Molecular Virology, The John P. Robarts Research Institute, University of Western Ontario, London, Ontario N6A 5K8, Canada. mbhatia@rri.on.ca

The Journal of Experimental Medicine
|April 6, 1999
PubMed
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Bone morphogenetic proteins (BMPs) directly regulate human hematopoietic stem cells, influencing their proliferation, differentiation, and repopulating capacity. This discovery offers new therapeutic avenues for stem cell development.

Area of Science:

  • Hematology
  • Developmental Biology
  • Stem Cell Biology

Background:

  • Cytokines are the primary known regulators of human hematopoietic stem cells, but few act directly on these cells.
  • Bone morphogenetic proteins (BMPs) have been implicated in hematopoietic tissue specification in lower organisms and mice.
  • The role of BMPs in regulating primitive human hematopoietic stem cells remains largely unexplored.

Purpose of the Study:

  • To investigate the direct effects of BMPs on the proliferation and differentiation of highly purified human hematopoietic stem cells.
  • To identify BMP receptors and downstream signaling molecules expressed by human hematopoietic stem cells.
  • To determine the impact of different BMPs on stem cell phenotype, clonogenicity, and repopulating capacity.

Main Methods:

Related Experiment Videos

  • Isolation of rare CD34(+)CD38(-)Lin- human hematopoietic stem cells from adult and neonatal sources.
  • Analysis of BMP type I receptors (ALK-3, ALK-6) and SMAD transducers (SMAD-1, -4, -5) expression.
  • Treatment of stem cell populations with soluble BMP-2, -4, and -7.
  • Assessment of proliferation, clonogenicity, cell surface phenotype, and multilineage repopulation capacity in NOD/SCID mice.

Main Results:

  • BMPs directly regulate proliferation, differentiation, and repopulating capacity of human hematopoietic stem cells.
  • BMP type I receptors ALK-3 and ALK-6, and SMADs 1, 4, and 5 are expressed by CD34(+)CD38(-)Lin- stem cells.
  • BMP-2 and BMP-7 inhibited proliferation at high concentrations but maintained stem cell phenotype and repopulation capacity.
  • BMP-4 at low concentrations induced proliferation and differentiation, while high concentrations promoted stem cell survival in ex vivo culture.

Conclusions:

  • BMPs are potent regulators of human hematopoietic stem cell function, including proliferation, differentiation, and survival.
  • BMP signaling provides a novel pathway for controlling human stem cell development.
  • This study establishes a valuable model for investigating BMP action in primary human hematopoietic stem cells.