title: Cytoskeleton and ion movements during volume regulation in cultured PC12 cells.
abstract: The present study investigates the role of cytoskeletal elements, microtubules and microfilaments, on ion transport systems activated during volume regulatory processes in PC12 pheochromocytoma cells. Disruption of microtubule network by colchicine (0.1 mM) or vinblastine sulfate (10 microM) has no significant effect on PC12 cell hydration or on changes of the intracellular K+, Cl- and Na+ content observed in hypo-osmotic conditions. Disruption of microfilament network by cytochalasin B strongly affects volume regulation in a dose-dependent manner. Cytochalasin B leads to a potentiation of the initial cell swelling and the regulatory volume decrease is suppressed. Although, the internal K+ and Cl- level decreases significantly, as demonstrated by measurements of intracellular ion content and 86Rb fluxes. Using the patch-clamp technique, we could demonstrate in PC12 cell membranes an ion channel whose gating is affected by application of a negative hydrostatic pressure (mechanical stress) to the membrane patch, by exposure of the cell to hypoosmotic medium (osmotic stress), or by disruption of the microfilament network with cytochalasin B.
authors.affiliation: Laboratory of Cell and Tissue Biology, University of Liège, Belgium.
authors.forename: M
authors.initials: M
authors.lastname: Cornet
authors.forename: J
authors.initials: J
authors.lastname: Ubl
authors.forename: H A
authors.initials: HA
authors.lastname: Kolb
mesh_terms: D008841:Actin Cytoskeleton / Q000187:drug effects / Q000378:metabolism; D000310:Adrenal Gland Neoplasms / Q000378:metabolism; D000818:Animals; D048429:Cell Size / Q000187:drug effects; D003571:Cytochalasin B / Q000494:pharmacology; D003599:Cytoskeleton / Q000378:metabolism*; D006874:Hydrostatic Pressure; D015640:Ion Channel Gating; D007473:Ion Channels / Q000378:metabolism*; D017136:Ion Transport; D007700:Kinetics; D008564:Membrane Potentials; D008870:Microtubules / Q000378:metabolism; D009997:Osmotic Pressure; D016716:PC12 Cells; D010673:Pheochromocytoma / Q000378:metabolism; D051381:Rats; D012413:Rubidium / Q000493:pharmacokinetics
chemical_list: D007473:Ion Channels; D003571:Cytochalasin B; D012413:Rubidium