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Title: Fluoxetine potentiates GABAergic IPSCs in rat hippocampal neurons
Author: Ye, Zeng-You ; Zhou, Ke-Qing ; Xu, Tian-Le(徐天乐) ; Zhou, Jiang-Ning
Source: NEUROSCIENCE LETTERS
Issued Date: 2008
Volume: 442, Issue:1, Pages:24-29
Keyword: GABAergic hypothesis ; whole-cell patch-clamp recording ; antidepressant ; neurotransmission ; 5-HT ; GAMMA-AMINOBUTYRIC-ACID ; MAGNETIC-RESONANCE-SPECTROSCOPY ; DEPRESSED-PATIENTS ; PLASMA-CONCENTRATIONS ; AFFECTIVE-ILLNESS ; MAJOR DEPRESSION ; MOOD DISORDERS ; GABA ; SEROTONIN ; NORFLUOXETINE
Subject: Neurosciences & Neurology
Corresponding Author: Zhou, JN (reprint author), Univ Sci & Technol China, Hefei Natl Lab Phys Sci & Microscale, Hefei 230027, Anhui, Peoples R China,zyye@mail.ustc.edu.cn
English Abstract: The GABA system is highly involved in the pathophysiology of mood disorders such as depression. Altered GABAergic function is evident in depressed patients and animal models of depression. Currently, the most widely used antidepressants are selective 5-HT reuptake inhibitors, such as fluoxetine. However, the effects of fluoxetine on GABAergic synaptic neurotransmission remain poorly investigated. Whole-cell patch-clamp recordings from cultured rat hippocampal neurons were therefore conducted to investigate the effects of fluoxetine on GABAergic neurotransmission. The spontaneous inhibitory postsynaptic current (sIPSC) was completely blocked by 10 mu M bicuculline and reversibly potentiated by 30 mu M fluoxetine. The fluoxetine potentiation on either amplitude or frequency of sIPSCs was dose-dependent, with the EC50 values of 10.96 and 14.26 mu M, respectively. This potentiation was also TTX-insensitive, suggesting independence of presynaptic action potentials. The ritanserin (5 mu M), a selective 5-HT2 receptor antagonist, did not alter the fluoxetine potentiation on miniature inhibitory postsynaptic currents. Taken together, our data suggest that fluoxetine can potentiate GABAergic neurotransmission without depending on presynaptic firing of action potentials and its elevating of 5-HT receptor activities. This potentiation by fluoxetine may normalize the hippocampal GABA deficit during depression and in part exert its antidepressant activity. (c) 2008 Elsevier Ireland Ltd. All rights reserved.
Indexed Type: SCI
Language: 英语
Content Type: 期刊论文
URI: http://ir.sibs.ac.cn/handle/331001/1701
Appears in Collections:神经所(总)_期刊论文

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Ye, Zeng-You; Zhou, Ke-Qing; Xu, Tian-Le; Zhou, Jiang-Ning.Fluoxetine potentiates GABAergic IPSCs in rat hippocampal neurons,NEUROSCIENCE LETTERS,2008,442(1):24-29
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