Journal
CELLULAR SIGNALLING
Volume 18, Issue 4, Pages 422-432Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.cellsig.2005.05.002
Keywords
progenitor cell; neurokinin receptor; tachykinin; cytokine; p53; hematopoiesis; TF-beta; GM-CSF
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Funding
- NCI NIH HHS [CA89868] Funding Source: Medline
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The bone mar-row (BM) is home to at least two stem cells, hematopoietic (HSC) and mesenchymal. Hematopoiesis is partly regulated through neurokinin-1 (NK-1) and NK-2 belonging to the family of G-protein/7-transmembrane receptors. NK-1 and NK-2 show preference for the neurotransmitters, substance P (SP) and neurokinin-A (NK-A), respectively. Hematopoietic suppression mediated by NK-A could be partly explained through the production of TGF-beta I and MIP-1 alpha. This study further characterizes mechanisms by which NK-A inhibits progenitor cell proliferation. The study addresses the hypothesis that p53 is a mediator of NK-A activation and this occurs partly through p53-mediated expression of NK-2. The studies first analyzed two consensus sequences for p53 in supershift assays. Reporter gene assays with NK-2 gene constructs and p53 expressing wild-type and mutant vectors, combined with cell proliferation assays, show NK-A activating p53 to inhibit the proliferation of K562 progenitors. These effects were reversed by hematopoietic stimulators, GM-CSF and SP. Verification studies with human CD34(+)/CD38(-) and CD34(+)/CD38(+) BM progenitors show similar mechanisms with the expression of p21. This study reports on p53 as central to NK-A-NK-2 interaction in cell cycle quiescence of hematopoietic progenitors. These effects are reversed by at least two hematopoietic stimulators, SP and GM-CSF, with concomitant downregulation of p53. (c) 2005 Elsevier Inc. All rights reserved.
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