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Extrasynaptic GABA(A) channels activated by THIP are modulated by diazepam in CA1 pyramidal neurons in the rat brain hippocampal slice.
Molecular and Cellular Physiology, Department of Physiological Sciences, Lund University.
2003 (English)In: Molecular and Cellular Neuroscience, ISSN 1044-7431, E-ISSN 1095-9327, Vol. 24, no 1, 250-7 p.Article in journal (Refereed) Published
Abstract [en]

Single-channel currents were activated by THIP (4,5,6,7-tetrahydroisoxazolo[5,4-c]pyridin-3-ol) in cell-attached patches on CA1 pyramidal neurons in the rat hippocampal slice preparation. THIP activated GABA(A) channels after a delay that was concentration-dependent and decreased by 1 microM diazepam. The currents showed outward rectification. Channels activated at depolarized 40 mV relative to the chloride reversal potential had low conductance (<40 pS) but the conductance increased with time, resulting in high-conductance channels (>40 pS). The average maximal-channel conductances for 2 and 100 microM THIP were 59 and 62 pS (-Vp = 40 mV), respectively, whereas in 2 microM THIP plus 1 microM diazepam, it was 71 pS. The results show that in hippocampal neurons THIP activates channels with characteristics similar to those of channels activated by low concentrations (0.5-5 microM ) of GABA. The increase in the inhibitory conductance with membrane depolarization permits gradation of the shunt pathway relative to the level of the excitatory input.

Place, publisher, year, edition, pages
2003. Vol. 24, no 1, 250-7 p.
National Category
Neurosciences Physiology
URN: urn:nbn:se:uu:diva-182717PubMedID: 14550784OAI: oai:DiVA.org:uu-182717DiVA: diva2:560643
Available from: 2012-10-15 Created: 2012-10-15 Last updated: 2012-10-15

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Birnir, Bryndis
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