Crossref journal-article
American Society of Hematology
Blood (234)
Abstract

AbstractThe microenvironment is a key regulator of hematopoietic stem cells (HSCs) and is a likely source of extracellular factors that control stem cell fate. A better understanding of these microenvironmental factors may come from investigations of developmental cell fate determination in which the critical roles of cell-cell interactions of multipotential cells have been shown. The Wnt gene family is known to regulate the cell fate and cell-cell interactions of multipotential cells in a variety of tissues. Expression of Wnts and of their putative receptors encoded by murine homologs of the Drosophila frizzled gene in hematopoietic tissues was examined by reverse transcriptase-polymerase chain reaction. Wnt-5a and Wnt-10b were expressed in day-11 murine yolk sac, day-14 fetal liver, and fetal liver AA4+ cells. The expression profiles of four murine frizzled homologs, Mfz3-7, were nearly identical to that of Wnt-5a and Wnt-10b. Notably, Wnt-10b was expressed in the fetal liver AA4+ Sca+ c-kit+ (flASK) HSC population. A role for Wnts in HSC fate determination was studied by treatment of HSC populations in culture with soluble WNT proteins. The addition of conditioned media from cells transfected with Wnt-1, Wnt-5a, or Wnt-10b cDNAs to cultures of flASK cells stimulated a sevenfold, eightfold, and 11-fold expansion in cell number, respectively, relative to control media. Removal of WNT-5a from this media by immunodepletion depleted the stimulatory activity from the media, whereas addition of a partially purified WNT-5a stimulated a fivefold expansion relative to control cells. Transduction of flASK cells with a retrovirus bearing a Wnt-5a cDNA enhanced proliferation. We conclude that WNTs stimulate the survival/proliferation of hematopoietic progenitors, demonstrating that WNTs comprise a novel class of hematopoietic cell regulators.

Bibliography

Austin, T. W., Solar, G. P., Ziegler, F. C., Liem, L., & Matthews, W. (1997). A Role for the Wnt Gene Family in Hematopoiesis: Expansion of Multilineage Progenitor Cells. Blood, 89(10), 3624–3635.

Authors 5
  1. Timothy W. Austin (first)
  2. Gregg P. Solar (additional)
  3. Francis C. Ziegler (additional)
  4. Linda Liem (additional)
  5. William Matthews (additional)
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Dates
Type When
Created 5 years, 10 months ago (Oct. 14, 2019, 5:11 a.m.)
Deposited 2 years, 11 months ago (Oct. 1, 2022, 1:49 p.m.)
Indexed 1 hour, 7 minutes ago (Sept. 2, 2025, 7:58 p.m.)
Issued 28 years, 3 months ago (May 15, 1997)
Published 28 years, 3 months ago (May 15, 1997)
Published Print 28 years, 3 months ago (May 15, 1997)
Funders 0

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@article{Austin_1997, title={A Role for the Wnt Gene Family in Hematopoiesis: Expansion of Multilineage Progenitor Cells}, volume={89}, ISSN={0006-4971}, url={http://dx.doi.org/10.1182/blood.v89.10.3624}, DOI={10.1182/blood.v89.10.3624}, number={10}, journal={Blood}, publisher={American Society of Hematology}, author={Austin, Timothy W. and Solar, Gregg P. and Ziegler, Francis C. and Liem, Linda and Matthews, William}, year={1997}, month=may, pages={3624–3635} }