- Sensitivity of a renal K+ channel (ROMK2) to the inhibitory sulfonylurea compound glibenclamide is enhanced by coexpression with the ATP-binding cassette transporter cystic fibrosis transmembrane regulator. McNicholas, C.M., Guggino, W.B., Schwiebert, E.M., Hebert, S.C., Giebisch, G., Egan, M.E. Proc. Natl. Acad. Sci. U.S.A. (1996)