AJP - Lung Columbus Instruments
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH
 QUICK SEARCH:   [advanced]


     


Am J Physiol Lung Cell Mol Physiol (November 22, 2006). doi:10.1152/ajplung.00350.2006
This Article
Right arrow Full Text (PDF)
Right arrow All Versions of this Article:
292/4/L845    most recent
00350.2006v1
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Schuster, D. P.
Right arrow Articles by Mueckler, M.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Schuster, D. P.
Right arrow Articles by Mueckler, M.
Submitted on September 8, 2006
Accepted on November 18, 2006

Regulation of lipopolysaccharide-induced increases in neutrophil glucose uptake

Daniel P. Schuster1*, Steven Brody1, Zhaohui Zhou2, Matt Bernstein2, Robert Arch1, Daniel Link1, and Michael Mueckler1

1 Internal Medicine, Washington University School of Medicine, St. Louis, Missouri, United States
2 Mallinckrodt Institute of Radiology, Washington University School of Medicine, St. Louis, Missouri, United States

* To whom correspondence should be addressed. E-mail: daniel.schuster{at}wustl.edu.

The pathogenesis of many lung diseases involves neutrophilic inflammation. Neutrophil functions, in turn, are critically dependent on glucose uptake and glycolysis to supply the necessary energy to meet these functions. In this study, we determined the effects of p38 mitogen-activated protein kinase and hypoxia-inducible factor (HIF)-1, as well as their potential interaction, on the expression of membrane glucose transporters and on glucose uptake in murine neutrophils. Neutrophils were harvested and purified from C57Bl/6 mice and stimulated with lipolypolysaccharide (LPS) in the presence or absence of specific p38 and HIF-1 inhibitors. Glucose uptake was measured as the rate of [3H]-deoxyglucose (DG) uptake. We identified GLUT-1 in mouse neutrophils, but neither GLUT-3 nor GLUT-4 were detected by western analysis, even after LPS stimulation. LPS stimulation did not increase GLUT-1 protein levels, but did cause translocation of GLUT-1 from the cell interior to the cell surface together with a dose-dependent increase in [3H]DG uptake, indicating that glucose uptake is regulated in these cells. LPS also activated both p38 and the HIF-1 pathway. Inhibitors of p38 and HIF-1 blocked GLUT-1 translocation and [3H]DG uptake. These data suggest that LPS-induced increases in neutrophil glucose uptake are mediated by GLUT-1 translocation to the cell surface in response to sequential activation of neutrophil p38 and HIF-1{alpha} in neutrophils. Given that neutrophil function and glucose metabolism are closely linked, control of the latter may represent a new target to ameliorate the deleterious effects of neutrophils on the lungs.







HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH
Visit Other APS Journals Online
Copyright © 2006 by the American Physiological Society.