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Direct action of genistein on CFTR

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Weinreich,  Frank
Department of Biophysical Chemistry, Max Planck Institute of Biophysics, Max Planck Society;
Johann-Wolfgang-Goethe-Universität, FB 15, Frankfurt am Main, Germany;

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Wood,  Phillip G.
Department of Biophysical Chemistry, Max Planck Institute of Biophysics, Max Planck Society;

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Nagel,  Georg
Department of Biophysical Chemistry, Max Planck Institute of Biophysics, Max Planck Society;
Johann-Wolfgang-Goethe-Universität, FB 15, Frankfurt am Main, Germany;

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Citation

Weinreich, F., Wood, P. G., Riordan, J. R., & Nagel, G. (1997). Direct action of genistein on CFTR. Pflügers Archiv: European Journal of Physiology, 434, 484-491. doi:10.1007/s004240050424.


Cite as: http://hdl.handle.net/21.11116/0000-0007-4C77-F
Abstract
Human cystic fibrosis transmembrane conductance regulator (CFTR) chloride channels were expressed in oocytes from Xenopus laevis after injection of CFTR cRNA and studied with the two-electrode voltage-clamp and the giant patch techniques. The tyrosine kinase inhibitor genistein alone activated a small chloride current in whole oocytes expressing CFTR and substantially increased the chloride current obtained upon stimulation with forskolin and isobutyl methylxanthine (IBMX). In giant excised patches, genistein was unable to open protein-kinase-A-phosphorylated CFTR channels in the absence of ATP, but increased the ATP-induced CFTR channel currents by a factor of 3.8 ± 1.7. This genistein-mediated potentiation in excised patches is independent of protein phosphatase activity, as it is readily reversible, even after complete inhibition of protein kinase A activity. Involvement of protein tyrosine kinases also seems unlikely, because this effect of genistein is not antagonized by high concentrations of the tyrosine phosphatase inhibitor ortho-vanadate. We, therefore, propose a direct interaction of genistein with CFTR, probably at a nucleotide binding site, which leads to a higher open probability.