| Literature DB >> 19497284 |
Inga Hofmann1, Elizabeth H Stover, Dana E Cullen, Junhao Mao, Kelly J Morgan, Benjamin H Lee, Michael G Kharas, Peter G Miller, Melanie G Cornejo, Rachel Okabe, Scott A Armstrong, Nico Ghilardi, Stephen Gould, Frederic J de Sauvage, Andrew P McMahon, D Gary Gilliland.
Abstract
We report the unexpected finding that loss of Hh signaling through conditional deletion of Smoothened (Smo) in the adult hematopoietic compartment has no apparent effect on adult hematopoiesis, including peripheral blood count, number or cell-cycle status of stem or progenitor cells, hematopoietic colony-forming potential, long-term repopulating activity in competitive repopulation assays, or stress response to serial 5-fluorouracil treatment. Furthermore, pharmacologic inhibition of Hh signaling with a potent and selective small molecule antagonist has no substantive effect on hematopoiesis in the mouse. In addition, Hh signaling is not required for the development of MLL-AF9-mediated acute myeloid leukemia (AML). Taken together, these data demonstrate that Hh signaling is dispensable for normal hematopoietic development and hematopoietic stem cell function, indicating that targeting of Hh signaling in solid tumors is not likely to result in hematopoietic toxicity. Furthermore, the Hh pathway may not be a compelling target in certain hematopoietic malignancies.Entities:
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Year: 2009 PMID： 19497284 PMCID： PMC3065323 DOI： 10.1016/j.stem.2009.03.016
Source DB: PubMed Journal: Cell Stem Cell ISSN： 1875-9777 Impact factor: 24.633