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Title: Activators of the energy sensing kinase AMPK inhibit random cell movement and chemotaxis in U937 cells.
Austin Authors: Kanellis, John;Kandane, Rangi K;Etemadmoghadam, Dariush;Fraser, Scott A;Mount, Peter F ;Levidiotis, Vicki;Kemp, Bruce E;Power, David Anthony
Affiliation: Nephrology
Issue Date: 1-Feb-2006
Publication information: Immunology and Cell Biology
Abstract: AMP-activated protein kinase (AMPK) is a key energy sensor, known to regulate energy metabolism in diverse cell types. Hypoxia is encountered frequently in the microenvironments of inflammatory lesions and is a critical regulator of function in inflammatory cells. Energy deficiency is one of the consequences of hypoxia, but its potential role in modulating leucocyte function has received little attention. Using micropore chemotaxis assays to assess migratory responses of the monocyte-like cell line U937, it was found that the AMPK activators AICAR and phenformin rapidly reduced random migration (chemokinesis) as well as chemotaxis due to stromal cell-derived factor (SDF)1alpha. There was an approximate 50% reduction in both chemokinesis and chemotaxis following 30 min preincubation with both AICAR and phenformin (P < 0.01), and this continued with up to 24 h preincubation. The binding of SDF1alpha to its receptor CXCR4 was unaltered, suggesting AMPK was acting on downstream intracellular signalling pathways important in cell migration. As AMPK and statins are known to inhibit HMG CoA reductase, and both reduce cell migration, the effect of mevastatin on U937 cells was compared with AMPK activators. Mevastatin inhibited cell migration but required 24 h preincubation. As expected, the inhibitory effect of mevastatin was associated with altered subcellular localization of the Rho GTPases, RhoA and cdc42, indicating decreased prenylation of these molecules. Although the effect of AMPK activation was partially reversed by mevalonate, this was not associated with altered subcellular localization of Rho GTPases. The data suggest that activation of AMPK has a general effect on cell movement in U937 cells, and this is not due to inhibition of HMG CoA reductase. These are the first data to show an effect of AMPK on cell movement, and suggest a fundamental role for energy deficiency in regulating cellular behaviour.
DOI: 10.1111/j.1440-1711.2005.01388.x
Journal: Immunology and Cell Biology
Type: Journal Article
Subjects: Aminoimidazole Carboxamide.analogs & derivatives.pharmacology
Cell Movement.drug effects
Chemokine CCL2.pharmacology
Chemokine CXCL12
Chemokines, CXC.pharmacology
Chemotaxis.drug effects
Dose-Response Relationship, Drug
Drug Synergism
Enzyme Activation
Enzyme Activators.pharmacology
Lovastatin.analogs & derivatives.pharmacology
Mevalonic Acid.analogs & derivatives.pharmacology
Protein Kinases.metabolism.physiology
U937 Cells
rho GTP-Binding Proteins.metabolism
Appears in Collections:Journal articles

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