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Blood, 1 January 2008, Vol. 111, No. 1, pp. 42-49. Prepublished online as a Blood First Edition Paper on October 10, 2007; DOI 10.1182/blood-2007-07-099648.
CHEMOKINES, CYTOKINES, AND INTERLEUKINS The coordinated action of G-CSF and ELR + CXC chemokines in neutrophil mobilization during acute inflammation1 Leukocyte Biology Section, National Heart and Lung Institute, Faculty of Medicine, Imperial College London, London, United Kingdom
In this study, we have identified a unique combinatorial effect of the chemokines KC/MIP-2 and the cytokine granulocyte colony-stimulating factor (G-CSF) with respect to the rapid mobilization of neutrophils from the bone marrow in a model of acute peritonitis. At 2 hours following an intraperitoneal injection of thioglycollate, there was a 4.5-fold increase in blood neutrophil numbers, which was inhibited 84% and 72% by prior administration of blocking mAbs against either the chemokines KC/MIP-2 or G-CSF, respectively. An intraperitoneal injection of G-CSF acted remotely to stimulate neutrophil mobilization, but did not elicit recruitment into the peritoneum. Further, in vitro G-CSF was neither chemotactic nor chemokinetic for murine neutrophils, and had no priming effect on chemotaxis stimulated by chemokines. Here, we show that, in vitro and in vivo, G-CSF induces neutrophil mobilization by disrupting their SDF-1
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