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Blood, 15 February 2005, Vol. 105, No. 4, pp. 1467-1475.
Prepublished online as a Blood First Edition Paper on October 19, 2004; DOI 10.1182/blood-2004-04-1604.
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HEMATOPOIESIS
RhoH, a hematopoietic-specific Rho GTPase, regulates proliferation, survival, migration, and engraftment of hematopoietic progenitor cells
Yi Gu,
Aparna C. Jasti,
Michael Jansen, and
Jamie E. Siefring
From the Division of Experimental Hematology, Cincinnati Children's Hospital Research Foundation, University of Cincinnati College of Medicine, Cincinnati, OH, and the Division of Pediatric Informatics, Cincinnati Children's Hospital Research Foundation, University of Cincinnati College of Medicine, Cincinnati, OH.
Rho guanosine triphosphatases (GT-Pases) are recognized as critical mediators of signaling pathways regulating actin assembly, migration, proliferation, and survival in hematopoietic cells. Here, we have studied a recently identified hematopoietic-specific Rho GTPase, RhoH. Unlike most members of the Rho GTPase family, RhoH is GTPase deficient and does not cycle between GTP- and guanosine diphosphate (GDP)–bound forms, suggesting that regulation of RhoH expression may be critical in its activity. We found that RhoH is expressed in murine hematopoietic progenitor cells (HPCs) and fully differentiated myeloid and lymphoid lineages. In cytokine-stimulated HPCs, knockdown of RhoH expression via RNA interference stimulates proliferation, survival, and stromal cell-derived factor-1 (SDF-1)–induced migration in vitro. Conversely, RhoH overexpression in these cells via retrovirus-mediated gene transfer is associated with impaired activation of Rac GTPases, reduced proliferation, increased apoptosis, and defective actin polymerization and chemotaxis. In vivo, HPCs with RhoH overexpression demonstrate defective hematopoietic reconstitution capability compared with control vector-transduced cells. Our results suggest that RhoH serves as a negative regulator of both growth and actin-based function of HPCs possibly via suppression of Rac-mediated signaling.
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