Cited by 278Hematopoietic Stem Cell TransplantationMesenchymal stem cell researchProtein Kinase Regulation and GTPase Signaling

The DOI matches its Crossref record; 30 of the 30 references it cites were found in a registry or an index.

Rac GTPases differentially integrate signals regulating hematopoietic stem cell localization

Abstract

The molecular events that regulate engraftment and mobilization of hematopoietic stem cells and progenitors (HSC/Ps) are still incompletely defined. We have examined the role of the Rho GTPases Rac1 and Rac2 in HSC engraftment and mobilization. Rac1, but not the hematopoietic-specific Rac2, is required for the engraftment phase of hematopoietic reconstitution, because Rac1(-/-) HSCs did not rescue in vivo hematopoiesis after transplantation, but deletion of Rac1 after engraftment did not impair steady-state hematopoiesis. Rac1(-/-) HSC/Ps showed impaired spatial localization to the endosteum but near-normal homing to the medullary cavity in vivo. Interaction with the bone marrow microenvironment in vitro was markedly altered. Whereas post-engraftment deletion of Rac1 alone did not impair hematopoiesis, deficiency of both Rac1 and Rac2 led to massive mobilization of HSCs from the marrow associated with ineffective hematopoiesis and intense selection for Rac-expressing HSCs. This mobilization was reversible by re-expression of Rac1. In addition, a rationally designed, reversible small-molecule inhibitor of Rac activation led to transient mobilization of engraftable HSC/Ps. Rac proteins thus differentially regulate engraftment and mobilization phenotypes, suggesting that these biological processes and steady-state hematopoiesis are biochemically separable and that Rac proteins may be important molecular targets for stem cell modification.

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Crossref · 10.1038/nm1274

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Metadata

Authors
Cancelas, J. A., Lee, A. W., Prabhakar, R., Stringer, K. F., Zheng, Y., & Williams, D. A.
Affiliations
Cincinnati Children's Hospital Medical Center (US)
Corresponding author
Williams, David A
Venue
Nature Medicine
Published
2005-07-17
Volume
11
Issue
8
Pages
886-891
ISSN
  • 1078-8956 (ISSN-L)
  • 1546-170X
OpenAlex
W2064771788
Cited by
278
References
30
Citations by year
2026: 2 · 2025: 2 · 2024: 4 · 2023: 2 · 2022: 4 · 2021: 3 · 2020: 12 · 2019: 6 · 2018: 11 · 2017: 11 · 2016: 7 · 2015: 20 · 2014: 11 · 2013: 20 · 2012: 21
FWCI
13.61
Type
journal article
Language
en
Open access
closed
Locations
  • Nature Medicine (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institute of General Medical Sciences (R01GM060523)
  • National Institute of Diabetes and Digestive and Kidney Diseases (R01 DK62752)
Topics
  • Health Sciences › Medicine › Hematology › Hematopoietic Stem Cell Transplantation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Mesenchymal stem cell research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
Keywords
Rac1, Rac2, Rho GTPases, hematopoietic stem cells, hematopoietic progenitor cells, engraftment, hematopoietic stem cell mobilization, endosteum, bone marrow microenvironment, hematopoiesis, stem cell targeting
MeSH terms
Aminoquinolines, Animals, Cell Movement, Flow Cytometry, Hematopoiesis, Hematopoietic Stem Cells, Neuropeptides, Pyrimidines, Signal Transduction, Bone Marrow Transplantation, Granulocyte Colony-Stimulating Factor, Gene Deletion, Hematopoietic Stem Cell Mobilization, rac GTP-Binding Proteins, rac1 GTP-Binding Protein, Cell Proliferation, Mice

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