Abstract
Alcohol use disorder (AUD) is a common and complex disorder resulting from repetitive alcohol drinking. The mesocorticolimbic dopamine (DA) system, originating from the ventral tegmental area (VTA) in the midbrain, is involved in the rewarding effect of ethanol. The γ-aminobutyric acid (GABA) neurons in VTA appear to be key substrates of acute and chronic ethanol, which regulates DA neurotransmission indirectly in the mesocorticolimbic system. Despite significant research on the relationship between brain-derived neurotrophic factor (BDNF) and reduced alcohol consumption in male rats involving tropomyosin-related kinase B (TrkB), the mechanisms of BDNF-TrkB regulating alcohol behavior remain scarce. K+-Cl– cotransporter 2 (KCC2) plays a crucial role in synaptic function in GABAergic neurons by modulating intracellular chlorine homeostasis. Here, we found that 4-week intermittent alcohol exposure impaired the function of KCC2 in VTA, evidenced by a lower expression level of phosphorylated KCC2 and decreased ratio of phosphorylated KCC2 to total KCC2, especially 72 h after withdrawal from 4-week ethanol exposure in male rats. CLP290 (a KCC2 activator) reduced excessive alcohol consumption after alcohol withdrawal, whereas VU0240551 (a specific KCC2 inhibitor) further enhanced alcohol intake. Importantly, VU0240551 reversed the attenuating effects of BDNF and 7,8-dihydroxyflavone (7,8-DHF) on alcohol consumption after withdrawal. Moreover, intraperitoneal injection of 7,8-DHF upregulated KCC2 expression and phosphorylated KCC2 in VTA 72 h after withdrawal from ethanol exposure in male rats. Collectively, our data indicate that KCC2 may be critical in the regulating action of BDNF-TrkB on ethanol consumption in AUD.
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The datasets generated and analyzed during the current study are available from the corresponding author upon reasonable request.
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Acknowledgements
This study was supported by the National Science Foundation of China (NSFC) (81871041 to Y.Z.G.), Key Project of Heilongjiang Natural Science Foundation (ZD2022H007), Fundamental Scientific Research Project of Colleges in Heilongjiang Province (2021-KYYWF-0478), Key R & D Plan of Heilongjiang Province (GA21C010 to X.F.Z.), and Graduate Innovative Research Programs of Mudanjiang Medical University, China (2020YJSCX-MY03, Y.Z.G.).
Funding
This study was supported by the National Science Foundation of China (NSFC) (81871041 to Y.Z.G.), Key Project of Heilongjiang Natural Science Foundation (ZD2022H007 to Y.Z.G.), Fundamental Scientific Research Project of Colleges in Heilongjiang Province (2021-KYYWF-0478), Key R & D Plan of Heilongjiang Province (GA21C010 to X.F.Z.), and Graduate Innovative Research Programs of Mudanjiang Medical University, China (2020YJSCX-MY03, Y.Z.G.).
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All authors contributed to the study conception and design. Yanzhong Guan conceived the project. Material preparation, data collection, and analysis were performed by Hongyan Zhang, Lulu Xu, Junwei Xiong, Xinxin Li, Yindong Yang, Yong Liu, Chunfeng Zhang, Qiyu Wang, Jiajia Wang, Pengyu Wang, Xiaobin Wu, Xue Wang, and Xiaofeng Zhu. The first draft of the manuscript was written by Hongyan Zhang, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Zhang, H., Xu, L., Xiong, J. et al. Role of KCC2 in the Regulation of Brain-Derived Neurotrophic Factor on Ethanol Consumption in Rats. Mol Neurobiol 60, 1040–1049 (2023). https://doi.org/10.1007/s12035-022-03126-5
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DOI: https://doi.org/10.1007/s12035-022-03126-5