Type 7 Adenylyl Cyclase is Involved in the Ethanol and CRF Sensitivity of GABAergic Synapses in Mouse Central Amygdala.

Type 7 Adenylyl Cyclase is Involved in the Ethanol and CRF Sensitivity of GABAergic Synapses in Mouse Central Amygdala.
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DOI:
10.3389/fnins.2010.00207
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发表时间:
2011
影响因子:
4.3
通讯作者:
Roberto M
Roberto M
中科院分区:
医学2区
文献类型:
--
作者:
Cruz MT;Bajo M;Maragnoli ME;Tabakoff B;Siggins GR;Roberto M

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中央杏仁核 (CeA) 中的 GABA 能系统在乙醇依赖和乙醇戒断引起的焦虑反应中发挥着重要作用。此前,我们发现乙醇和促肾上腺皮质激素释放因子(CRF)都会增加小鼠和大鼠 CeA 神经元中的 GABA 能传递,部分是通过激活突触前 CRF1 受体来增强 GABA 的释放。 CRF1 受体与腺苷酸环化酶 (AC) 偶联,产生第二信使环 AMP。 AC 有九种亚型,但我们最近发现垂体中的 CRF1 受体与 7 型 AC (AC7) 偶联。因此,我们在脑切片中使用体外电生理学方法,研究了 AC7 信号通路在乙醇中的可能作用以及 CRF 对转基因小鼠 CeA GABA 能突触的影响,与同窝雄性野生型 (WT) 小鼠相比,其大脑 Adcy7 活性 (HET) 减弱。我们发现 HET 和 WT 小鼠之间的基底膜特性、诱发的 GABAA 受体介导的抑制性突触后电位 (IPSP) 的平均基线幅度或 GABAA-IPSP 的配对脉冲促进 (PPF) 没有显着差异。在 WT 小鼠的 CeA 神经元中,乙醇灌注显着增加了 GABAA-IPSP(增加了 39%)并减少了 PPF(增加了 25%),表明突触前 GABA 释放增加。然而,这些效应在 HET 小鼠中不存在。 CRF 灌注还显着增强了 WT CeA 神经元中的 IPSP(增加了 38%)并降低了 PPF(增加了 23%),并且在 HET 小鼠中仍然引起了 IPSP 幅度显着但较小(增加了 13%)的增加,但对 PPF 没有影响。这些电生理数据表明,AC7 在乙醇和 CRF 调节 CeA 突触前 GABA 释放中发挥重要作用,因此可能是乙醇相关行为(如焦虑和依赖)的基础。
The GABAergic system in the central amygdala (CeA) plays a major role in ethanol dependence and in the anxiogenic response to ethanol withdrawal. Previously, we found that both ethanol and corticotropin releasing factor (CRF) increase GABAergic transmission in mouse and rat CeA neurons, in part by enhancing the release of GABA via activation of presynaptic CRF1 receptors. CRF1 receptors are coupled to the enzyme adenylyl cyclase (AC), which produces the second messenger cyclic AMP. There are nine isoforms of AC, but we recently found that CRF1 receptors in the pituitary were coupled to the Type 7 AC (AC7). Therefore, using an in vitro electrophysiological approach in brain slices, here we have investigated a possible role of the AC7 signaling pathway in ethanol and CRF effects on CeA GABAergic synapses of genetically modified mice with diminished brain Adcy7 activity (HET) compared to their littermate male wild-type (WT) mice. We found no significant differences in basal membrane properties, mean baseline amplitude of evoked GABAA receptor-mediated inhibitory postsynaptic potentials (IPSPs), or paired-pulse facilitation (PPF) of GABAA-IPSPs between HET and WT mice. In CeA neurons of WT mice, ethanol superfusion significantly augmented (by 39%) GABAA-IPSPs and decreased PPF (by 25%), suggesting increased presynaptic GABA release. However, these effects were absent in HET mice. CRF superfusion also significantly augmented IPSPs (by 38%) and decreased PPF (by 23%) in WT CeA neurons, and still elicited a significant but smaller (by 13%) increase of IPSP amplitude, but no effect on PPF, in HET mice. These electrophysiological data suggest that AC7 plays an important role in ethanol and CRF modulation of presynaptic GABA release in CeA and thus may underlie ethanol-related behaviors such as anxiety and dependence.
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