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Molecular mechanisms of excessive alcohol consumption and relapse-like behavior

过量饮酒和复发样行为的分子机制

基本信息

批准号：
8257830
负责人：
Reginald DeVon Cannady
金额：
$ 2.9万
依托单位：
UNIV OF NORTH CAROLINA CHAPEL HILL
依托单位国家：
美国
项目类别：
财政年份：
2011
资助国家：
美国
起止时间：
2011-09-01 至 2013-08-31
项目状态：
已结题

来源：
https://reporter.nih.gov/project-details/8257830
关键词：
Acids Address Alcohol consumption Alcohol dependence Alcoholism Alcohols Amino Acids Amygdaloid structure Behavior Behavioral Brain Brain region Cues Data Dependence Excitatory Synapse Glutamates Goals Heavy Drinking Immunohistochemistry Ion Channel Lead Light Maps Mediating Molecular Neurotransmitter Receptor Neurotransmitters Nucleus Accumbens Phosphorylation Post-Translational Protein Processing Pre-Clinical Model Predisposition Process Property Public Health Rattus Receptor Signaling Recording of previous events Relapse Rewards Rodent Model Role Self Administration Self-Administered Signal Transduction Site Specificity Stimulus Sucrose Synapses Techniques Testing Training Work abstracting addiction alcohol cue alcohol exposure alcohol reinforcement alcohol relapse alcohol seeking behavior alcohol use disorder alpha-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic Acid aniracetam calmodulin-dependent protein kinase II chronic alcohol ingestion drinking drinking behavior experience immunoreactivity inhibitor/antagonist insight neuroadaptation novel receptor reinforcer research study response reward processing synaptic function

项目摘要

Project Summary/Abstract The behavioral and molecular mechanisms underlying excessive alcohol drinking behavior and relapse are not fully understood and are vital for mapping the pathological course of alcoholism/dependence. Recent evidence indicates that chronic alcohol consumption leads to strengthening of excitatory synapses in key limbic brain regions that mediate reward and drinking behavior. This strengthening of synapses is highly dependent on the actions and synaptic incorporation of alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptors (AMPARs); fast action ion channel receptors that are activated by the excitatory neurotransmitter glutamate. However, the mechanistic role of enhanced AMPAR signaling in alcohol reinforcement and alcohol-seeking behavior remains unclear. Thus, the proposed experiments in this application seek to elucidate the behavioral and molecular mechanisms that underlie AMPAR-mediated increases in operant alcohol-self-administration and potentiated relapse-like behavior using a preclinical model of high alcohol consumption, the alcoholpreferring (P-) rat. Preliminary data indicate that enhancement of AMPAR signaling by pretreatment with aniracetam (positive allosteric modulator of AMPARs), increases operant alcohol self-administration and potentiates cue-induced reinstatement to alcohol seeking in P-rats, suggesting that enhanced AMPAR activity may be critical in facilitating increased drinking and susceptibility to relapse. Experiments will further characterize the role of enhanced AMPAR signaling in modulating operant self-administration and relapse-like behavior. AMPAR activity can be potentiated by post-translational modification (e.g. phosphorylation of the AMPAR GluR1 subunit amino acid residue 831;pGluR1{831}). Using immunohistochemistry techniques, experiments will map neuroadaptive changes in pGluR1{831} subunits in limbic brain regions after a history of alcohol self-administration or exposure to an alcohol-related cue during cue-induced reinstatement to determine brain regions that may influence enhanced AMPAR-mediated increases in self-administration and alcohol-seeking. We predict to see changes in pGluR1{831} in the nucleus accumbens (self-administration studies) or amygdala (reinstatement studies), and these regions will be targeted to investigate functional neuroanatomical control of enhanced AMPAR activity-mediated facilitation of alcohol self-administration and seeking behavior using aniracetam. Control experiments will address neuroanatomical and reinforcer specificity and non-specific locomotor effects. Lastly we will determine if aniracetam-induced increases in alcohol self-administration and seeking behavior are dependent on Ca2+/calmodulin-dependent protein kinase II (CamKII; known to phosphorylate GluR1 and enhance AMPAR activity) by blocking aniracetam-induced effects during self administration and reinstatement sessions with KN93 (CamKII inhibitor). Key findings from these studies will provide novel insight into AMPAR-related mechanisms in excessive alcohol drinking behavior and vulnerability to relapse.

项目总结/文摘