title: HGF promotes adhesion of ATP-depleted renal tubular epithelial cells in a MAPK-dependent manner.
abstract: Hepatocyte growth factor (HGF) has been shown to enhance recovery from renal tubular ischemia. We investigated the possibility that HGF improves recovery by preventing ischemia-induced loss of cell adhesion. Murine inner medullary collecting duct-3 (mIMCD-3) cells subjected to 90% ATP depletion demonstrated a 55% decrease in adhesion, an effect that was completely reversed by the addition of HGF. Assays examining release of adherent cells revealed similar results with 30 min of ATP depletion causing loss of adhesion of 25% of mIMCD-3 cells and HGF completely reversing this effect. In contrast, HGF was unable to reverse the loss of adhesion of cells exposed to 99% ATP depletion. Examination of the mitogen-activated protein kinase (MAPK) signaling pathway revealed that HGF could induce extracellular signal-regulated kinase (ERK) phosphorylation in control and 90% ATP-depleted cells but not in 99% ATP-depleted cells. Inhibition of ERK activation with U0126 completely blocked the HGF-dependent reversal of ATP-depleted cell adhesion. Thus ATP-depleted cells demonstrate a marked decrease in cell adhesion that is reversible by the addition of HGF. This effect of HGF requires activation of the MAPK pathway.
authors.affiliation: Section of Nephrology, Yale University School of Medicine, New Haven, Connecticut 06520, USA. zhen-xiang.liu@yale.edu
authors.forename: Z X
authors.initials: ZX
authors.lastname: Liu
authors.forename: C H
authors.initials: CH
authors.lastname: Nickel
authors.forename: L G
authors.initials: LG
authors.lastname: Cantley
mesh_terms: D000255:Adenosine Triphosphate / Q000172:deficiency; D000818:Animals; D002070:Butadienes / Q000494:pharmacology; D002448:Cell Adhesion / Q000187:drug effects*; D002460:Cell Line; D004791:Enzyme Inhibitors / Q000494:pharmacology; D004847:Epithelial Cells / Q000187:drug effects; D017228:Hepatocyte Growth Factor / Q000494:pharmacology*; D007684:Kidney Tubules / Q000187:drug effects*; D051379:Mice; D020928:Mitogen-Activated Protein Kinases / Q000037:antagonists & inhibitors / Q000378:metabolism*; D009570:Nitriles / Q000494:pharmacology
chemical_list: D002070:Butadienes; D004791:Enzyme Inhibitors; D009570:Nitriles; C113580:U 0126; D017228:Hepatocyte Growth Factor; D000255:Adenosine Triphosphate; D020928:Mitogen-Activated Protein Kinases