Summary
The reaction product against rat Isk protein antibody was demonstrated on the endolymphatic surface of the marginal cell of the guinea pig, using an immunohistochemical method. Clofilium, a potassium channel blocker which has been previously found to block rat kidney Isk channels, decreased the endocochlear potential (EP) when applied by perilymphatic perfusion and iontophoresis into endolymph. This finding of a decreased EP supports the presence of Isk protein on the endolymphatic surface of the marginal cell.
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Arena JP, Kass RS (1988) Block of heart potassium channels by clofilium and its tertiary analogs: relationship between drug structure and type of channel blocked. Mol Pharmacol 34: 60–66
Castle NA (1990) Selective inhibition of potassium currents in rat ventricle by clofilium and its tertiary homolog. J Pharmacol Exp Ther 257:342–350
Folander K, Smith JS, Antanavage J, Bennett C, Stein RB, Swanson R (1990) Cloning and expression of the delayed-rectifier Isk channel from neonatal rat heart and diethylstilbestrolprimed rat uterus. Proc Natl Acad Sci USA 87:2975–2979
Konishi T, Hamrich PE (1978) Ion transport in the cochlea of the guinea pig. 1. Potassium and sodium transport. Acta Otolaryngol(Stockh) 86:22–34
Marcus DC (1984) Characterization of potassium permeability of cochlear duct by perilymphatic perfusion of barium. Am J Physiol 247: C240-C246
Marcus DC, Rokugo M, Ge X-X, Thalmann R (1983) Response of cochlear potentials to presumed alterations of ionic conductance: endolymphatic perfusion of barium, valinomycin and nystatin. Hear Res 12:17–30
Melichar I, Syka J (1987) Electrophysiological measurements of the stria vascularis potentials in vivo. Hear Res 25:35–43
Offner FF, Dallos P, Cheatham MA (1987) Positive endocochlear potential: mechanism of production by marginal cells of stria vascularis. Hear Res 29:117–124
Sakagami M, Fukazawa K, Matsunaga T, Fujita H, Mori N, Takumi T, Ohkubo H, Nakanishi S (1991) Cellular localization of rat Isk protein in the stria vascularis by immunohistochemical observation. Hear Res 56:168–172
Salt AN, Konishi T (1982) Functional importance of sodium and potassium in the guinea pig cochlea studied with amiloride and tetraethylammonium. Jpn J Physiol 32:219–230
Salt AN, Melichar I, Thalmann R (1987) Mechanisms of endocochlear potential generation by stria vascularis. Laryngoscope 97:984–991
Sugimoto T, Tanabe Y, Shigemoto R, Iwai M, Takumi T, Ohkubo H, Nakanishi S (1990) Immunohistochemical study of a rat membrane protein which induces a selective potassium permeation: its localization in the apical membrane portion of epithelial cells. J Membr Biol 113:39–47
Takumi T, Ohkubo H, Nakanishi S (1988) Cloning of a membrane protein that induces a slow voltage-gated potassium current. Science 242:1042–1045
Vaughan-Williams EM (1984) A classification of antiarrhythmic actions reassessed after a decade of new drugs. J Clin Pharmacol 24:129–147
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This work was presented in part at the 28th Workshop on Inner Ear Biology, Tubingen, Germany, 8–11 September 1991
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Mori, N., Sakagami, M., Fukazawa, K. et al. An immunohistochemical and electrophysiological study on Isk protein in the stria vascularis of the guinea pig. Eur Arch Otorhinolaryngol 250, 186–189 (1993). https://doi.org/10.1007/BF00171709
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DOI: https://doi.org/10.1007/BF00171709