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GABA-activated single channel currents in outside-out membrane patches from rat retinal ganglion cells

Published online by Cambridge University Press:  02 June 2009

Stuart A. Lipton
Stuart A. Lipton
Affiliation:
Laboratory of Cellular and Molecular Neurophysiology, Department of Neurology, The Children's Hospital, and the Program in Neuroscience, Harvard Medical School
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Abstract

γ-aminobutyric acid (GABA) evokes large whole-cell currents in solitary mammalian retinal ganglion cells studied by the patch-clamp method. This evidence suggests that GABA acts directly on the retinal ganglion cells as an inhibitory transmitter as it does elsewhere in the mammalian central nervous system. Here, single-channel recordings of the currents underlying the GABA-induced responses were studied in outside-out patches of cell membrane. In some other preparations, single GABAA channels recorded in the excised patch configuration have been shown to have altered properties in comparison to responses elicited during whole-cell recording. For example, in cortical neurons single GABA-activated channels in excised patches display accelerated desensitization kinetics as well as rapid rundown of the response. Therefore, in retinal ganglion cells, responses generated by GABA in cell-free patches were compared to whole-cell responses. After determining that the responses to GABA in acutely isolated outside-out patches were indeed similar to those of the whole-cell currents in retinal ganglion cells, the unitary conductances were studied. It was determined that these single-channel events resemble those reported in other nervous tissues with 4 elementary conductances of ~10 pS, 19–22 pS, 30–33 pS, and 45–50 pS at 33–35°C.

Keywords

Single-channel recordingGABA-activated channelsRetinal ganglion cellsCell cultureMammalian visual neurons
Type
Short communication
Information
Visual Neuroscience , Volume 3 , Issue 3 , September 1989 , pp. 275 - 279
Copyright
Copyright © Cambridge University Press 1989

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References

Blair, L.A.C., Levitan, E.S., Marshall, J., Dionne, V.E. & Barnard, E.A. (1988). Single subunits of the GABAA receptor formion channels with properties of the native receptor. Science 242, 577–579.CrossRefGoogle ScholarPubMed
Bormann, J. & Clapham, D.E. (1984). γ-aminobutyric acid receptor channels in adrenal chromaffin cells: a patch-clamp study. Proceedings of the National Academy of Sciences of the U.S.A. 82, 2168–2172.CrossRefGoogle Scholar
Bormann, J., Hamill, O.P. & Sakmann, B. (1987). Mechanism of an-ion permeation through channels gated by glycine and γ-aminobutyric acid in mouse cultured spinal neurones. Journal of Physiology (London) 385, 243–286.CrossRefGoogle Scholar
Frosch, M.P. (1987). GABA-activated currents and channels in cultured rat cortical neurons. Doctoral Thesis, Harvard University, Cambridge, MA.Google Scholar
Frosch, M.P., Lipton, S.A. & Dichter, M. (1989). In preparation.Google Scholar
Hamill, O.P., Sigworth, F.J., Neher, E. & Sakmann, B. (1981). Improved patch-clamp techniques for high-resolution current recording from cells and cell-free membrane patches. Pflügers Archiv 391, 85–100.CrossRefGoogle ScholarPubMed
Hamill, O.P., Bormann, J. & Sakmann, B. (1983). Activation of multiple-conductance state chloride channels in spinal neurones by glycine and GABA. Nature 305, 805–808.CrossRefGoogle ScholarPubMed
Ishida, A.T. & Cohen, B.N. (1988). GABA-activated whole-cell currents in isolated retinal ganglion cells. Journal of Neurophysiology 60, 381–396.CrossRefGoogle ScholarPubMed
Karschin, A. & Lipton, S.A. (1989). Calcium in solitary retinal ganglion cells from post-natal rat. Journal of Physiology (London) (in press).CrossRefGoogle ScholarPubMed
Leifer, D., Lipton, S.A., Barnstable, C.J. & Masland, R.H. (1984). Monoclonal antibody to Thy-1 enhances regeneration of processes by rat retinal ganglion cells in culture. Science 224, 303–306.CrossRefGoogle ScholarPubMed
Levitan, E.S., Blair, L.A.C., Dionne, V.E. & Barnard, E.A. (1988). Biophysical and pharmacological properties of cloned GABAA receptor subunits expressed in Xenopus oocytes. Neuron 1, 773–781.CrossRefGoogle ScholarPubMed
Levitan, E.S., Schofield, P.R., Burt, D.R., Rhee, L.M., Wisden, W., Köhler, M., Fujita, N., Rodriguez, H.F., Stephenson, A., Darlison, M.G., Barnard, E.A. & Seeburg, P.H. (1988). Structural and functional basis for GABAa receptor heterogeneity. Nature 335, 76–79.CrossRefGoogle ScholarPubMed
Lipton, S.A. (1987). Bursting of calcium-activated cation-selective channels is associated with neurite regeneration in a mammalian central neuron. Neuroscience Letters 82, 21–28.CrossRefGoogle Scholar
Lipton, S.A., Aizenman, E. & Loring, R.H. (1987). Neural nicotinic acetylcholine responses in solitary mammalian retinal ganglion cells. Pflügers Archiv 410, 37–43.CrossRefGoogle ScholarPubMed
Lipton, S.A. & Tauck, D.L. (1987). Voltage-dependent conductances of solitary ganglion cells dissociated from the rat retina. Journal of Physiology (London) 385, 361–391.CrossRefGoogle ScholarPubMed
Massey, S.C. & Redburn, D.A. (1987). Transmitter circuits in the vertebrate retina. Progress in Neurobiology 28, 55–96.CrossRefGoogle ScholarPubMed