Eric H Mitten, Anna Souders, Ezequiel Marron Fernandez de Velasco, Carolina Aguado, Rafael Luján, Kevin Wickman
{"title":"小鼠长期接触乙醇会导致腹侧被盖区GABA神经元突触前和突触后GABA能传导缺陷。","authors":"Eric H Mitten, Anna Souders, Ezequiel Marron Fernandez de Velasco, Carolina Aguado, Rafael Luján, Kevin Wickman","doi":"10.1111/bph.17335","DOIUrl":null,"url":null,"abstract":"<p><strong>Background and purpose: </strong>GABAergic neurons in mouse ventral tegmental area (VTA) exhibit elevated activity during withdrawal following chronic ethanol exposure. While increased glutamatergic input and decreased GABA<sub>A</sub> receptor sensitivity have been implicated, the impact of inhibitory signaling in VTA GABA neurons has not been fully addressed.</p><p><strong>Experimental approach: </strong>We used electrophysiological and ultrastructural approaches to assess the impact of chronic intermittent ethanol vapour exposure in mice on GABAergic transmission in VTA GABA neurons during withdrawal. We used CRISPR/Cas9 ablation to mimic a somatodendritic adaptation involving the GABA<sub>B</sub> receptor (GABA<sub>B</sub>R) in ethanol-naïve mice to investigate its impact on anxiety-related behaviour.</p><p><strong>Key results: </strong>The frequency of spontaneous inhibitory postsynaptic currents was reduced in VTA GABA neurons following chronic ethanol treatment and this was reversed by GABA<sub>B</sub>R inhibition, suggesting chronic ethanol strengthens the GABA<sub>B</sub>R-dependent suppression of GABAergic input to VTA GABA neurons. Similarly, paired-pulse depression of GABA<sub>A</sub> receptor-dependent responses evoked by optogenetic stimulation of nucleus accumbens inputs from ethanol-treated mice was reversed by GABA<sub>B</sub>R inhibition. Somatodendritic currents evoked in VTA GABA neurons by GABA<sub>B</sub>R activation were reduced following ethanol exposure, attributable to the suppression of GIRK (K<sub>ir</sub>3) channel activity. Mimicking this adaptation enhanced anxiety-related behaviour in ethanol-naïve mice.</p><p><strong>Conclusions and implications: </strong>Chronic ethanol weakens the GABAergic regulation of VTA GABA neurons in mice via pre- and postsynaptic mechanisms, likely contributing to their elevated activity during withdrawal and expression of anxiety-related behaviour. As anxiety can promote relapse during abstinence, interventions targeting VTA GABA neuron excitability could represent new therapeutic strategies for treatment of alcohol use disorder.</p>","PeriodicalId":9262,"journal":{"name":"British Journal of Pharmacology","volume":null,"pages":null},"PeriodicalIF":6.8000,"publicationDate":"2024-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Chronic ethanol exposure in mice evokes pre- and postsynaptic deficits in GABAergic transmission in ventral tegmental area GABA neurons.\",\"authors\":\"Eric H Mitten, Anna Souders, Ezequiel Marron Fernandez de Velasco, Carolina Aguado, Rafael Luján, Kevin Wickman\",\"doi\":\"10.1111/bph.17335\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><strong>Background and purpose: </strong>GABAergic neurons in mouse ventral tegmental area (VTA) exhibit elevated activity during withdrawal following chronic ethanol exposure. While increased glutamatergic input and decreased GABA<sub>A</sub> receptor sensitivity have been implicated, the impact of inhibitory signaling in VTA GABA neurons has not been fully addressed.</p><p><strong>Experimental approach: </strong>We used electrophysiological and ultrastructural approaches to assess the impact of chronic intermittent ethanol vapour exposure in mice on GABAergic transmission in VTA GABA neurons during withdrawal. We used CRISPR/Cas9 ablation to mimic a somatodendritic adaptation involving the GABA<sub>B</sub> receptor (GABA<sub>B</sub>R) in ethanol-naïve mice to investigate its impact on anxiety-related behaviour.</p><p><strong>Key results: </strong>The frequency of spontaneous inhibitory postsynaptic currents was reduced in VTA GABA neurons following chronic ethanol treatment and this was reversed by GABA<sub>B</sub>R inhibition, suggesting chronic ethanol strengthens the GABA<sub>B</sub>R-dependent suppression of GABAergic input to VTA GABA neurons. Similarly, paired-pulse depression of GABA<sub>A</sub> receptor-dependent responses evoked by optogenetic stimulation of nucleus accumbens inputs from ethanol-treated mice was reversed by GABA<sub>B</sub>R inhibition. Somatodendritic currents evoked in VTA GABA neurons by GABA<sub>B</sub>R activation were reduced following ethanol exposure, attributable to the suppression of GIRK (K<sub>ir</sub>3) channel activity. Mimicking this adaptation enhanced anxiety-related behaviour in ethanol-naïve mice.</p><p><strong>Conclusions and implications: </strong>Chronic ethanol weakens the GABAergic regulation of VTA GABA neurons in mice via pre- and postsynaptic mechanisms, likely contributing to their elevated activity during withdrawal and expression of anxiety-related behaviour. 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Chronic ethanol exposure in mice evokes pre- and postsynaptic deficits in GABAergic transmission in ventral tegmental area GABA neurons.
Background and purpose: GABAergic neurons in mouse ventral tegmental area (VTA) exhibit elevated activity during withdrawal following chronic ethanol exposure. While increased glutamatergic input and decreased GABAA receptor sensitivity have been implicated, the impact of inhibitory signaling in VTA GABA neurons has not been fully addressed.
Experimental approach: We used electrophysiological and ultrastructural approaches to assess the impact of chronic intermittent ethanol vapour exposure in mice on GABAergic transmission in VTA GABA neurons during withdrawal. We used CRISPR/Cas9 ablation to mimic a somatodendritic adaptation involving the GABAB receptor (GABABR) in ethanol-naïve mice to investigate its impact on anxiety-related behaviour.
Key results: The frequency of spontaneous inhibitory postsynaptic currents was reduced in VTA GABA neurons following chronic ethanol treatment and this was reversed by GABABR inhibition, suggesting chronic ethanol strengthens the GABABR-dependent suppression of GABAergic input to VTA GABA neurons. Similarly, paired-pulse depression of GABAA receptor-dependent responses evoked by optogenetic stimulation of nucleus accumbens inputs from ethanol-treated mice was reversed by GABABR inhibition. Somatodendritic currents evoked in VTA GABA neurons by GABABR activation were reduced following ethanol exposure, attributable to the suppression of GIRK (Kir3) channel activity. Mimicking this adaptation enhanced anxiety-related behaviour in ethanol-naïve mice.
Conclusions and implications: Chronic ethanol weakens the GABAergic regulation of VTA GABA neurons in mice via pre- and postsynaptic mechanisms, likely contributing to their elevated activity during withdrawal and expression of anxiety-related behaviour. As anxiety can promote relapse during abstinence, interventions targeting VTA GABA neuron excitability could represent new therapeutic strategies for treatment of alcohol use disorder.
期刊介绍：
The British Journal of Pharmacology (BJP) is a biomedical science journal offering comprehensive international coverage of experimental and translational pharmacology. It publishes original research, authoritative reviews, mini reviews, systematic reviews, meta-analyses, databases, letters to the Editor, and commentaries.
Review articles, databases, systematic reviews, and meta-analyses are typically commissioned, but unsolicited contributions are also considered, either as standalone papers or part of themed issues.
In addition to basic science research, BJP features translational pharmacology research, including proof-of-concept and early mechanistic studies in humans. While it generally does not publish first-in-man phase I studies or phase IIb, III, or IV studies, exceptions may be made under certain circumstances, particularly if results are combined with preclinical studies.
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