The dorsal striatum is a brain region crucial for expression of habit and goal-directed behaviors that has recently been linked to addiction. I found that ex vivo or in vivo ethanol exposure and withdrawal causes a long-lasting increase in the activity of the NMDA receptors (NMDARs) that contain NR2B subunits (NR2B- NMDARs) in the dorsomedial striatum (DMS), and that inhibition of NR2B-NMDARs specifically within the DMS attenuates rat operant ethanol self-administration (Wang et al., J Neurosci 2007;Wang et al., J Neurosci 2010). NMDAR-mediated glutamatergic transmission is crucial for synaptic plasticity and learning and memory, as well as for expression of some goal-directed behaviors. The DMS receives a number of different glutamatergic inputs, including corticostriatal (CortSt) and amygdalostriatal (AmygSt), and also contains two groups of principal neurons: dopamine D1 or D2 receptor-expressing medium spiny neurons (D1 or D2 MSNs, respectively). Very little is known about the glutamatergic neurotransmission in ethanol-exposed animals at these different inputs and cell types. Thus, the goal of this application is to elucidate how different afferent glutamatergic inputs in distinct types of neurons within the DMS are altered by excessive ethanol intake, with the long-term goal of determining how such alterations contribute to ethanol-drinking behaviors. My hypothesis, based in part on my preliminary results, is that NR2B-NMDAR-dependent glutamatergic transmission and synaptic plasticity in different striatal circuits (CortSt vs. AmygSt afferents and D1 vs. D2 MSNs) are differentially regulated by excessive ethanol consumption, and that ethanol-related adaptations are predominantly expressed in AmygSt inputs and in D1 MSNs. This hypothesis will be tested by pursuing the following aims: 1) to determine whether excessive ethanol consumption causes a differential increase in the CortSt and AmygSt glutamatergic transmission in the DMS of rats, 2) to determine whether AmygSt transmission facilitates induction of NMDAR-dependent long-term potentiation (LTP) at CortSt synapses in the DMS of naive and ethanol-drinking rats, and 3) to determine whether excessive ethanol consumption alters glutamatergic transmission differentially onto D1 or D2 MSNs of transgenic mice where D1 or D2 MSNs express a fluorescent marker. This application is highly innovative because it applies state-of-the- art approaches including the combination of optogenetics and transgenic mice, allowing us for the first time to determine how ethanol regulates synaptic transmission in different afferent projections to the DMS and different cell types within the DMS, which are important questions that cannot be addressed using conventional methodologies. Knowledge generated from this proposal will greatly facilitate our understanding of the mechanisms by which ethanol-mediated neuroadaptations in glutamatergic transmission are central to promoting pathological ethanol-drinking behaviors.
Alcohol-related adaptations in neurotransmission (a way by which brain cells communicate with each other) that are likely to be critical for driving excessive alcohol consumption are not clearly understood. Different brain cells and different inputs to the cells exhibit different neurotransmission that control different behaviors including alcohol-drinking behaviors. The studies in this proposal seek to examine whether and how alcohol alters neurotransmission distinctly in different brain cells and at different inputs to the cells. Results obtained will greatly improve our understanding of the mechanisms by which alcohol-mediated neuroadaptations promote excessive, pathological alcohol consumption.
|Ma, Tengfei; Barbee, Britton; Wang, Xuehua et al. (2017) Alcohol induces input-specific aberrant synaptic plasticity in the rat dorsomedial striatum. Neuropharmacology 123:46-54|
|Peng, Jiajie; Bai, Kun; Shang, Xuequn et al. (2017) Predicting disease-related genes using integrated biomedical networks. BMC Genomics 18:1043|
|Huang, Cathy C Y; Ma, Tengfei; Roltsch Hellard, Emily A et al. (2017) Stroke triggers nigrostriatal plasticity and increases alcohol consumption in rats. Sci Rep 7:2501|
|Zhao, Tianyi; Zhang, Ningyi; Zhang, Ying et al. (2017) A novel method to identify pre-microRNA in various species knowledge base on various species. J Biomed Semantics 8:30|
|Wei, Xiaoyan; Ma, Tengfei; Cheng, Yifeng et al. (2017) Dopamine D1 or D2 receptor-expressing neurons in the central nervous system. Addict Biol :|
|Hu, Hai-Jie; Luo, Xue-Gang; Dong, Qing-Qing et al. (2016) Ethanol extract of Zhongtian hawthorn lowers serum cholesterol in mice by inhibiting transcription of 3-hydroxy-3-methylglutaryl-CoA reductase via nuclear factor-kappa B signal pathway. Exp Biol Med (Maywood) 241:667-74|
|Wan, Guoqiang; Zhou, Wenyang; Hu, Yang et al. (2016) Transcriptional Regulation of lncRNA Genes by Histone Modification in Alzheimer's Disease. Biomed Res Int 2016:3164238|
|Zhang, Tianjiao; Hu, Yang; Wu, Xiaoliang et al. (2016) Identifying Liver Cancer-Related Enhancer SNPs by Integrating GWAS and Histone Modification ChIP-seq Data. Biomed Res Int 2016:2395341|
|Han, Na; Yu, Weiwen; Qiang, Yujun et al. (2016) T4SP Database 2.0: An Improved Database for Type IV Secretion Systems in Bacterial Genomes with New Online Analysis Tools. Comput Math Methods Med 2016:9415459|
|Jia, Hongbing; Du, Pengcheng; Yang, Hui et al. (2016) Nosocomial transmission of Clostridium difficile ribotype 027 in a Chinese hospital, 2012-2014, traced by whole genome sequencing. BMC Genomics 17:405|
Showing the most recent 10 out of 15 publications