title: Inhibition of HGF/SF-induced membrane ruffling and cell motility by transient elevation of cytosolic free Ca2+.
abstract: HGF/SF (0.5-100 ng/ml) induced rapid membrane ruffling, formation of microspikes, and increased motility of HT115 cells within 5 min of addition. These effects were not accompanied by any change in cytosolic free Ca2+ concentration. However, ATP (0.5-10 mM) induced a transient rise in cytosolic free Ca2+ concentration in HT115 cells from a resting concentration of 100 nM to a peak of 400 nM before returning to baseline within 3 min. The addition of ATP to cells treated with HGF/SF inhibited both membrane ruffling and cell movement. The effect of ATP was attributed to the transient rise in cytosolic free Ca2+ concentration, because cytosolic BAPTA, which prevented the rise in cytosolic free Ca2+ concentration, also abolished the inhibitory effect of ATP. Raising cytosolic free Ca2+ concentration with ionomycin and ADP also inhibited membrane ruffling. It was thus concluded that transiently raised cytosolic free Ca2+ concentration inhibited HGF/SF-induced membrane ruffling of HT115 cells.
authors.affiliation: University Department of Surgery, University of Wales College of Medicine, Cardiff, United Kingdom.
authors.forename: W G
authors.initials: WG
authors.lastname: Jiang
authors.forename: S
authors.initials: S
authors.lastname: Hiscox
authors.forename: S K
authors.initials: SK
authors.lastname: Singhrao
authors.forename: T
authors.initials: T
authors.lastname: Nakamura
authors.forename: M C
authors.initials: MC
authors.lastname: Puntis
authors.forename: M B
authors.initials: MB
authors.lastname: Hallett
mesh_terms: D000241:Adenosine / Q000494:pharmacology; D000244:Adenosine Diphosphate / Q000494:pharmacology; D000255:Adenosine Triphosphate / Q000494:pharmacology; D002118:Calcium / Q000378:metabolism*; D002460:Cell Line; D002462:Cell Membrane / Q000187:drug effects / Q000648:ultrastructure*; D002465:Cell Movement / Q000187:drug effects*; D002614:Chelating Agents / Q000494:pharmacology; D003110:Colonic Neoplasms; D003600:Cytosol / Q000187:drug effects / Q000378:metabolism; D004533:Egtazic Acid / Q000031:analogs & derivatives / Q000494:pharmacology; D017228:Hepatocyte Growth Factor / Q000494:pharmacology*; D006801:Humans; D015759:Ionomycin / Q000494:pharmacology; D007700:Kinetics; D008855:Microscopy, Electron, Scanning; D013997:Time Factors; D014407:Tumor Cells, Cultured; D014741:Video Recording
chemical_list: D002614:Chelating Agents; D004533:Egtazic Acid; D015759:Ionomycin; D000244:Adenosine Diphosphate; D017228:Hepatocyte Growth Factor; D000255:Adenosine Triphosphate; C025603:1,2-bis(2-aminophenoxy)ethane-N,N,N',N'-tetraacetic acid; D000241:Adenosine; D002118:Calcium