Summary
The patch-clamp technique for the recording of single-channel currents was used to investigate the activity of ion channels in the intact epithelium of the toad urinary bladder. High resistance seals were obtained from the apical membrane of tightly stretched tissue. Single-channel recordings revealed the activity of a variety of ion channels that could be classified in 4 groups according to their mean ion conductances, ranging from 5 to 59 pS. In particular, we observed highly selective, amiloridesensitive Na channels with a mean conductance of 4.8 pS, channels with a similar conductance that were not Na-selective and channels with mean conductance values of 17–58 pS that were mostly seen after stimulation of the tissue with vasopressin or cAMP. When inside-out patches from the apical membrane were exposed to 110mm fluoride, large conductances (86–490 pS) appeared.
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Aelvoet, I., Erlij, D., VanDriessche, W. 1988. Activation and blockage of a calcium-sensitive cation-selective pathway in the apical membrane of toad urinary bladder.J. Physiol. (London) 398: 555–574
Armstrong, D., Eckert, R. 1987. Voltage-activated calcium channels that must be phosphorylated to respond to membrane depolarization.Proc. Nat. Acad. Sci. USA 84: 2518–2522
Avenet, P., Hofmann, F., Lindemann, B. 1988. Transduction in taste receptor cells requires cAMP-dependent protein kinase.Nature (London) 331: 351–354
Bidet, S., Berthonaud, V., Gobin, R., Chevalier, J., Bourguet, J., Ripoche, P. 1985. Apical material extracted from amphibian urinary bladder epithelium by enzymes and detergent treatment.Biol. Cell 55: 191–198
Chad, J., Kalman, D., Armstrong, D. 1986. The role of cAMP-dependent phosphorylation in the maintenance and the modulation of voltage-activated calcium channels.In: Cell Calcium and the Control of Membrane Transport. L.J. Mandel and D.C. Eaton, editors. pp. 167–186. Rockefeller University, New York
Chase, H.S. 1984. Does calcium couple the apical and basolateral membrane permeabilities in epithelia?Am. J. Physiol. 247: F869-F876
Christensen, O., Zeuthen, T. 1987. Maxi K+ channels in leaky epithelia are regulated by intracellular Ca2+, pH and membrane potential.Pfluegers Arch. 408: 249–259
Cuthbert, A.W., Shum, W.K. 1975. Effects of vasopressin and aldosterone on amiloride binding in toad bladder epithelial cells.Proc. R. Soc. London B. 189: 543–575
Donaldson, P. 1986. The electrophysiology of toad urinary bladder. Ph.D. Thesis. University of Otago. Dunedin, New Zealand
Eaton, D.C., Hamilton, K.L. 1986. Ion transport across epithelial tissue: New insight from single channel measurements.Fed. Proc. 45: 2707
Eaton, D.C., Hamilton, K.L. 1988. The amiloride-blockable sodium channel of epithelial tissues.In: Ion channels. T. Narahashi, editor. Vol. 1, pp. 251–282. Plenum, New York
Erlij, D., Schoen, H.F., VanDriessche, W. 1986. Oxytocin and cAMP stimulate four different ion channels in isolated amphibian epithelial tissue.J. Physiol. (London) 377: 33P
Ewald, D.A., Williams, A., Levitan, I.B. 1985. Modulation of single Ca2+-dependent K+-channel activity by protein phosphorylation.Nature (London) 315: 503–506
Garty, H. 1986. Mechanisms of aldosterone action in tight epithelia.J. Membrane Biol. 90: 193–205
Garty, H., Asher, C. 1986. Ca2+-induced down-regulation of Na+ channels in toad bladder epithelium.J. Biol. Chem. 261: 7400–7406
Garty, H., Benos, D.J. 1988. Characteristics and regulatory mechanisms of the amiloride-blockable Na channel.Physiol. Rev. 68: 304–374
Garty, H., Edelman, I.S. 1983. Amiloride-sensitive trypsinization of apical sodium channels.J. Gen. Physiol. 81: 785–803
Gitter, H.A., Beyenbach, K.W., Christine, C.W., Gross, P., Minuth, W.W., Froemter, E. 1987. High conductance K+ channel in apical membranes of principal cell cultures from rabbit cortical collecting duct anlagen.Pfluegers Arch. 408: 282–290
Gögelein, H., Greger, R. 1986. Na+ selective channels in the apical membrane of the rabbit late proximal tubules (pars recta).Pfluegers Arch. 406: 198–203
Hamill, O.P., Marty, A., Neher, E., Sakmann, B., Sigworth, F.J. 1981. Improved patch-clamp techniques for high resolution current recording from cells and cell-free membrane patches.Pfluegers Arch. 391: 85–100
Hamilton, K.L., Eaton, D.C. 1985. Single channel recordings from amiloride-sensitive epithelial sodium channels.Am. J. Physiol. 249: C200-C207
Hamilton, K.L., Eaton, D.C. 1986a. Regulation of single sodium channels in renal tissue: A role in sodium homeostasis.Fed. Proc. 45: 2713–2717
Hamilton, K.L., Eaton, D.C. 1986b. Single-channel recordings from two types of amiloride-sensitive epithelial Na+ channels.Membr. Biochem. 6: 149–171
Horn, R., Patlak, J. 1980. Single channel current from excised patches of muscle membrane.Proc. Nat. Acad. Sci. USA 77: 6930–6934
Hunter, M., Giebisch, G. 1987. Multi-barrelled K channels in renal tubules.Nature (London) 327: 522–524
Hynie, S., Sharp, G.W.G. 1970. Adenyl cyclase in toad bladder.Biochim. Biophys. Acta 230: 40–51
Ilani, A., Lichtstein, D., Bacaner, M.B. 1982. Bretylium opens mucosal amiloride-sensitive sodium channels.Biochim. Biophys. Acta 693: 503–506
Ilani, A., Yachin, S., Lichtstein, D. 1984. Comparison between bretylium and diphenylhydantoin interaction with mucosal sodium-channels.Biochim. Biophys. Acta 777: 323–330
Kipnowski, J., Park, C.S., Fanestil, D.D. 1983. Modification of carboxyl of Na+ channel inhibits aldosterone action on Na+ transport.Am. J. Physiol. 245: F726-F734
Kits, K.S., Mos, G.J., Leeuwerik, F.J., Wattel, C. 1987. Acquisition analysis of fast single channel kinetic data on an Apple Ile microcomputer.J. Neurosci. Methods 20: 57–71
Koefoed-Johnson, V., Ussing, H.H. 1958. The nature of the frog skin potential.Acta Physiol. Scand. 42: 298–308
Koeppen, B.M., Beyenbach, K.W., Helman, S.I. 1984. Single channel currents in renal tubules.Am. J. Physiol. 247: F380-F384
Kolb, H.A., Brown, C.D., Murer, H. 1985. Identification of a voltage-dependent anion channel in the apical membranes of a Cl−-secretory epithelium (MDCK).Pfluegers Arch. 403: 262–265
Kolb, H.-A., Brown, C.D.A., Murer, H. 1986. Characterization of a Ca-dependent maxi K channel in the apical membrane of a cultured renal epithelium (JTC-12.P3).J. Membrane Biol. 92: 207–215
Krouse, M.E., Schneider, G.T., Gage, P.W. 1986. A large anionselective channel has seven conductance levels.Nature (London) 319: 58–60
Leaf, A., Hays, R.M. 1962. Permeability of the isolated toad bladder to solutes and its modification by vasopressin.J. Gen. Physiol. 45: 921–932
Levitan, I.B. 1985. Phosphorylation of ion channels.J. Membrane Biol. 87: 177–190
Li, J.H.-Y., Lindemann, B. 1983. Competitive blocking of epithelial sodium channels by organic cations: The relationship between macroscopic and microscopic inhibition constants.J. Membrane Biol. 76: 235–251
Li, J.H.-Y., Palmer, L.G., Edelman, I.S., Lindemann, B. 1982. The role of sodium-channel density in the natriferic response of the toad urinary bladder to an antidiuretic hormone.J. Membrane Biol. 64: 77–89
Lichtenstein, N.S., Leaf, A. 1965. Effect of amphotericin B on the permeability of the toad bladder.J. Clin. Invest. 8: 1328–1342
Lindemann, B. 1984. Fluctuation analysis of sodium channels in epithelia.Annu. Rev. Physiol. 46: 497–515
Lindemann, B., VanDriessche, W. 1978. Sodium-specific membrane channels of frog skin are pores: Current fluctuations reveal high turnover.Science 195: 292–294
Lindemann, B., VanDriessche, W. 1978. The mechanism of Na uptake through Na-selective channels in the epithelium of frog skin.In: Membrane Transport Processes. J.F. Hoffmann, editor, Vol. I, pp. 155–178. Raven, New York
Macknight, A.D.C., DiBona, D.R., Leaf, A. 1980. Sodium transport across toad urinary bladder: A model “tight” epithelium.Physiol. Rev. 60: 615–715
McManus, O.B., Blatz, A.L., Magleby, K.L. 1987. Sampling, log binning, fitting, and plotting of open and shut intervals from single channels and the effect of noise.Pfluegers Arch. 410: 530–553
Nakamura, T., Gold, G.H. 1987. A cyclic nucleotide-gated conductance in olfactory receptor cilia.Nature (London) 325: 442–444
Navarte, J., Finn, A.L. 1980. Anion-sensitive sodium conductance in the apical membrane of toad urinary bladder.J. Gen. Physiol. 76: 69–81
Neher, E. 1982. Unit conductance studies in biological membranes.Tech. Cell. Physiol. P121: 1–16
Nelson, D.J., Tang, J.M., Palmer, L.G. 1984. Single-channel recordings of the apical membrane chloride conductance in A6 epithelial cells.J. Membrane Biol. 80: 81–89
Omachi, R.S., Robbie, D.E., Handler, J.S., Orloff, J. 1974. Effect of ADH and other agents on cyclic AMP accumulation in toad bladder epithelium.Am. J. Physiol. 226: 1152–1157
Palmer, L.G. 1982. Ion selectivity of the apical membrane Na channel in the toad urinary bladder.J. Membrane Biol. 67: 91–98
Palmer, L.G. 1986. Apical membrane K conductance in the toad urinary bladder.J. Membrane Biol. 92: 217–226
Palmer, L.G., Edelman, I.S. 1981. Control of apical sodium permeability in the toad urinary bladder by aldosterone.Ann. NY Acad. Sci. 372: 1–14
Palmer, L.G., Frindt, G. 1986. Amiloride-sensitive Na channels from the apical membrane of the rat cortical collecting tubule.Proc. Nat. Acad. Sci. USA 83: 2767–2770
Palmer, L.G., Frindt, G. 1987. Effects of cell Ca and pH on Na channels from rat cortical collecting tubule.Am. J. Physiol. 253: F333-F339
Palmer, L.G., Li, J.H.-Y., Lindemann, B., Edelman, I.S. 1982. Aldosterone control of the density of sodium channels in the toad urinary bladder.J. Membrane Biol. 64: 91–102
Park, C.S., Fanestil, D.D. 1980. Covalent modification and inhibition of an epithelial sodium channel by a tyrosine-reactive reagent.Am. J. Physiol. 239: F299-F306
Rae, J.L. 1985. The application of patch clamp methods to ocular epithelia.Curr. Eye Res. 4: 409–420
Rae, J.L., Levis, R.A. 1984. Patch voltage clamp of lens epithelial cells: Theory and practice.Molec. Physiol. 6: 115–162
Revel, H.R. 1963. Phosphoprotein phosphatase.Methods Enzymol. 6: 211–214
Rick, R., Dörge, A., Macknight, A.D.C., Leaf, A., Thurau, K. 1978. Electron microprobe analysis of the different epithelial cells of toad urinary bladder.J. Membrane Biol. 39: 257–271
Sakmann, B., Neher, E. 1983. Single Channel Recording. Plenum, New York
Sariban-Sohraby, S., Benos, D. 1986. The amiloride sensitive sodium channel.Am. J. Physiol. 250: C175-C190
Sariban-Sohraby, S., Burg, M., Wiesmann, W.P., Chiang, P.K., Johnsohn, J.P. 1984a. Methylation increases sodium transport into A6 apical membrane vesicles: Possible mode of aldosterone action.Science 225: 745–746
Sariban-Sohraby, S., Latorre, R., Burg, M., Olans, L., Benos, D. 1984b. Amiloride-sensitive epithelial Na+ channels reconstituted into planar lipid bilayer membranes.Nature (London) 308: 80–82
Schlondorff, D., Franki, N. 1980. Effect of vasopressin on cyclic AMP-dependent protein kinase in toad urinary bladder.Biochim. Biophys. Acta 628: 1–12
Sheffner, A.L. 1963. The reduction in vitro in viscosity of mucoprotein solutions by a new mucolytic agent,n-acetyl-l-cysteine.Ann. NY Acad. Sci. 106: 298–310
Shuster, M.J., Camardo, J.S., Siegelbaum, S.A., Kandel, E.R. 1985. Cyclic AMP-dependent protein kinase closes the serotonin-sensitive K+ channels ofAplysia sensory neurones in cell-free membrane patches.Nature (London) 313: 392–395
VanDriessche, W. 1987. Ca2+ channels in the apical membrane of the toad urinary bladder.Pfluegers Arch. 410: 243–249
VanDriessche, W., Aelvoet, I., Erlij, D. 1987. Oxytocin and cAMP stimulate monovalent cation movements through a Ca2+-sensitive, amiloride-insensitive channel in the apical membrane of the toad urinary bladder.Proc. Nat. Acad. Sci. USA 84: 313–317
VanDriessche, W., Zeiske, W. 1985. Ionic channels in epithelial cell membranes.Physiol. Rev. 65: 833–903
Wills, N.K., Zweifach, A. 1987. Recent advances in the characterization of epithelial ion channels.Biochim. Biophys. Acta 906: 1–31
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Frings, S., Purves, R.D. & Macknight, A.D.C. Single-channel recordings from the apical membrane of the toad urinary bladder epithelial cell. J. Membrain Biol. 106, 157–172 (1988). https://doi.org/10.1007/BF01871398
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DOI: https://doi.org/10.1007/BF01871398