title: Tyrosine kinase inhibition affects skate anion exchanger isoform I alterations after volume expansion.
abstract: Upon exposure to hypotonic medium, skate red blood cells swell and then reduce their volume by releasing organic osmolytes and associated water. The regulatory volume decrease is inhibited by stilbenes and anion exchange inhibitors, suggesting involvement of the red blood cell anion exchanger skAE1. To determine the role of tyrosine phosphorylation, red blood cells were volume expanded with and without prior treatment with the tyrosine kinase inhibitor piceatannol. At the concentration used, 130 microM, piceatannol nearly completely inhibits p72(syk), a tyrosine kinase previously shown to phosphorylate skAE1 (M. W. Musch, E. H. Hubert, and L. Goldstein. J Biol Chem 274: 7923-7928, 1999). Hyposmotic-induced volume expansion stimulated association of p72(syk) with a light membrane fraction of skate red blood cells. Piceatannol did not inhibit this association but decreased hyposmotically stimulated increased skAE1 tyrosine phophorylation. Movement of skAE1 from an intracellular to a surface detergent-resistant membrane domain and tetramer formation were not inhibited by piceatannol treatment. Two effects of hyposmotic-induced volume expansion, decreased band 4.1 binding and increased ankyrin, were both inhibited by piceatannol. These results suggest that at least one event requiring p72(syk) activation is pivotal for hyposmotic-induced increased transport; however, steps that do not require tyrosine phosphorylation may also play a role.
authors.affiliation: The Martin Boyer Laboratories, Department of Medicine, The University of Chicago, Chicago, Illinois, USA.
authors.forename: Mark W
authors.initials: MW
authors.lastname: Musch
authors.forename: Leon
authors.initials: L
authors.lastname: Goldstein
mesh_terms: D000818:Animals; D001457:Anion Exchange Protein 1, Erythrocyte / Q000378:metabolism*; D017487:Ankyrins / Q000378:metabolism; D001810:Blood Volume / Q000187:drug effects / Q000502:physiology*; D015153:Blotting, Western; D002462:Cell Membrane / Q000378:metabolism; D004591:Electrophoresis, Polyacrylamide Gel; D004791:Enzyme Inhibitors / Q000494:pharmacology*; D004792:Enzyme Precursors / Q000502:physiology; D004912:Erythrocytes / Q000737:chemistry; D047468:Immunoprecipitation; D047908:Intracellular Signaling Peptides and Proteins; D008566:Membranes / Q000201:enzymology / Q000378:metabolism; D009994:Osmolar Concentration; D010766:Phosphorylation; D010952:Plasma Substitutes / Q000494:pharmacology*; D011505:Protein-Tyrosine Kinases / Q000037:antagonists & inhibitors* / Q000502:physiology; D012860:Skates, Fish / Q000502:physiology; D013267:Stilbenes / Q000494:pharmacology; D000072377:Syk Kinase; D013654:Taurine / Q000378:metabolism
chemical_list: D001457:Anion Exchange Protein 1, Erythrocyte; D017487:Ankyrins; D004791:Enzyme Inhibitors; D004792:Enzyme Precursors; D047908:Intracellular Signaling Peptides and Proteins; D010952:Plasma Substitutes; D013267:Stilbenes; D013654:Taurine; C041525:3,3',4,5'-tetrahydroxystilbene; D011505:Protein-Tyrosine Kinases; D000072377:Syk Kinase