DJ-1-Dopamine Transporter Interactions in Models of Addiction

DJ-1-多巴胺转运蛋白在成瘾模型中的相互作用

• 批准号: 8029284
• 负责人: Amy Beatrice Manning-Bog
• 金额: $ 9.56万
• 依托单位: SRI INTERNATIONAL
• 依托单位国家: 美国
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-03-01 至 2013-02-28
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8029284
• 关键词: Acute; Addictive Behavior; Affect; American; Antioxidants; Behavior; Behavioral; Binding; Brain; Cell membrane; Central Nervous System Diseases; Centrifugation; Chronic; Cocaine; Development; Disease; Dopamine; Drug usage; Evaluation; Exposure to; Functional disorder; Genetic Predisposition to Disease; Goals; Health; Impairment; Laboratories; Measures; Mediating; Methamphetamine; Modeling; Molecular; Morbidity - disease rate; Mus; Mutation; Neurodegenerative Disorders; Neurons; Neurotoxins; Nucleus Accumbens; Oxidation-Reduction; PARK7 protein; Parkinson Disease; Parkinsonian Disorders; Pathway interactions; Pharmaceutical Preparations; Play; Preparation; Property; Proteins; Regulation; Research; Rewards; Role; Surveys; Testing; Therapeutic; Time; Transgenic Mice; Transgenic Model; Transgenic Organisms; Ventral Tegmental Area; Western Blotting; addiction; behavioral sensitization; cocaine exposure; cocaine use; conditioning; dopamine transporter; drug of abuse; drug seeking behavior; endophenotype; gene environment interaction; insight; mortality; motor impairment; mouse model; neurotransmission; new therapeutic target; nigrostriatal pathway; novel; presynaptic; psychostimulant; radioligand; response; trafficking; uptake

DESCRIPTION (provided by applicant): The long term goal of our research is to elucidate whether DJ-1 and its related pathways represent a convergent mechanism for disorders involving dopaminergic dysfunction. The objectives of this pilot proposal are: (1) to determine whether the Parkinson's disease-associated protein DJ-1 contributes to the molecular mechanisms underlying reward acquisition in the mesolimbic pathway, and (2) whether behaviors in response to psychomotor stimulants are altered in DJ-1-deficient mice. Cellular localization of the dopamine transporter (DAT) regulates dopamine uptake activity and thus represents a target mechanism underlying addiction. Our transgenic mouse model the DJ-1-deficiency demonstrates enhanced presynaptic DAT levels, which leads to increased vulnerability to neurotoxicants in models of Parkinson's disease. No thorough analysis of the impact of DJ-1 and its related mechanisms on dopaminergic neurotransmission in the mesolimbic pathway has been performed. We posit that DJ-1 deficiency likely alters DAT localization and activity in the mesolimbic pathway, and through this mechanism, may contribute to behavioral changes following exposure to drugs of abuse. If our hypotheses are correct, these studies should identify a novel mechanism involved in reward acquisition and provide a new target for therapeutics to counter the addictive effects of drugs of abuse. PUBLIC HEALTH RELEVANCE: Use of cocaine and methamphetamine (METH) contributes to morbidity and mortality in nearly 7 million Americans (2008 National Survey on Drug Use and Health). Currently, few therapeutic options are available to inhibit drug-seeking behaviors. The long-term goal of our research is to delineate novel targets that affect reward responses in the brain. On the path to achieving this goal, we propose to identify new pathological substrates of the mechanisms that contribute to development of addiction, specifically the Parkinson's disease (PD)-related protein DJ-1. Our studies in DJ-1-deficient transgenic mice have revealed alterations in the dopamine transporter (DAT) that contribute to neuronal vulnerability and locomotor impairments in the nigrostriatal pathway. Because DAT is integral to the reward response, we expect that DJ-1 or its related mechanisms may contribute to reward acquisition in models of psychomotor stimulant use.

描述（由申请人提供）：我们研究的长期目标是阐明DJ-1及其相关通路是否代表多巴胺能功能障碍的趋同机制。该试点方案的目的是：(1)确定帕金森病相关蛋白DJ-1是否参与中脑边缘通路中奖励获得的分子机制；(2)DJ-1缺陷小鼠对精神运动兴奋剂的反应行为是否发生改变。多巴胺转运体（DAT）的细胞定位调节多巴胺摄取活性，因此代表了成瘾的靶机制。我们的转基因小鼠dj -1缺失模型显示突触前DAT水平增强，这导致帕金森病模型对神经毒物的易感性增加。尚未深入分析DJ-1对中脑边缘通路多巴胺能神经传递的影响及其相关机制。我们认为，DJ-1缺乏可能会改变中脑边缘通路的DAT定位和活动，并通过这种机制，可能导致药物滥用后的行为改变。如果我们的假设是正确的，这些研究将确定一个涉及奖励获得的新机制，并为治疗药物滥用成瘾效应提供一个新的靶点。