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- W2009507140 abstract "Transmembrane chloride flux mediated by the GABAA receptor and the desensitization of the receptor were followed using quench flow technique with 36Cl− and a membrane preparation from rat cerebral cortex. Measurements in short times allowed these two processes to be resolved. In general the ion-flux activity was desensitized in two phases. A fast phase took place in circa 200 ms (100 μM GABA) followed by a slower phase in several seconds. A minority (10%) of the membrane preparations did not display the fast phase. It is desirable to be able to separate these two phases of desensitization to facilitate analysis of the responses of the receptor. A short preincubation with GABA removed the fast phase from a subsequent measurement. In the absence of the fast phase the whole ion-flux equilibration was seen as a single phase. The measurements presented covering a time range of 0.01 seconds to 10 seconds show a single phase of ion flux which can be described by a first order ion influx process and a single first order desensitization process with a half time of circa 1 s (100 μM GABA). The results imply a single kinetically homogeneous population of vesicles containing a single population of GABA receptor (remaining active) with a single phase of desensitization. An understanding of this homogeneity, and how to ensure it, gives a basis for quantitatively testing the effects of drugs on these responses. Ion flux measurements with quench flow technique are a suitable tool for investigation of the mechanism of action of neurotransmitter receptors from brain." @default.
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- W2009507140 date "1987-07-01" @default.
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- W2009507140 title "γ-Aminobutyric acid (GABA) mediated transmembrane chloride flux with membrane vesicles from rat brain measured by quench flow technique: Kinetic homogeneity of ion flux and receptor desensitization" @default.
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- W2009507140 doi "https://doi.org/10.1016/0024-3205(87)90219-0" @default.
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