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Rac2-Deficient Hematopoietic Stem Cells Show Defective Interaction with the Hematopoietic Microenvironment and Long-Term Engraftment Failure

Jansen, Michael, Yang, Feng-Chun, Cancelas, José A., Bailey, Jeff R., Williams, David A.·2005·Stem Cells
DOI 10.1634/stemcells.2004-0216
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Abstract

The hematopoietic-specific Rho GTPase, Rac2, regulates a variety of cellular functions including cell shape changes, motility, integrin-dependent adhesion, and apoptosis. In the study reported here, we demonstrate that wild-type (WT) hematopoietic stem cells/progenitors (HSC/P) preferentially engraft in nonablated Rac2−/− bone marrow. In addition, primitive Rac2−/− HSC/P transplanted into lethally irradiated WT recipients showed a significant competitive defect compared with WT cells. These defects appeared to be related to HSC/P-intrinsic defective microenvironment interactions, since Rac2−/− cells showed less adhesion to the femur bone marrow density 1 (FBMD-1) stromal cell line, a lower frequency of cobblestone area–forming cells, and lower performance in long-term marrow cultures in vitro when compared with WT cells. In contrast, primitive Rac2−/− hematopoietic cells exhibited normal progenitor colony formation in semisolid medium in vitro and normal proliferation in the steady state in vivo when compared with WT cells. Taken together, these data suggest that Rac2−/− stem/progenitor cells exhibit abnormal interaction with the hematopoietic microenvironment, which leads to defective long-term engraftment.

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Cited by

Metadata

Authors
Jansen, M., Yang, F.-C., Cancelas, J. A., Bailey, J. R., & Williams, D. A.
Affiliations
  • Division of Experimental Hematology, Cincinnati Children's Research Foundation, Cincinnati, OH, USA
  • Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN, USA
Venue
Stem Cells
Publisher
Oxford University Press (OUP)
Published
2005-03-01
Volume
23
Issue
3
Pages
335-346
ISSN
  • 1066-5099
  • 1549-4918
DOI
10.1634/stemcells.2004-0216
Cited by
50
References
1
Language
en
Licence
academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model (vor)

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