Regulation of VTA dopamine neurons by AMP kinase

AMP 激酶对 VTA 多巴胺神经元的调节

• 批准号: 9339560
• 负责人: STEVEN WILLIAM JOHNSON
• 金额: --
• 依托单位: PORTLAND VA MEDICAL CENTER
• 依托单位国家: 美国
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-04-01 至 2019-03-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/9339560
• 关键词: AMPA Receptors; Action Potentials; Adenosine Monophosphate; Affect; Amphetamines; Autoreceptors; Behavior; Biochemical Pathway; Brain; Brain region; Cells; Cognitive; Data; Dependence; Diazoxide; Disease; Dopamine; Dopamine D2 Receptor; Dopaminergic Agents; Drug abuse; Emotional; Energy Metabolism; Enzymes; Generations; Glutamates; Homeostasis; Human; Incubated; Individual; Learning; Learning Disorders; Long-Term Potentiation; Mediating; Membrane; Metabolism; Methods; Midbrain structure; Mood Disorders; Morphine; N-Methyl-D-Aspartate Receptors; N-Methylaspartate; Na(+)-K(+)-Exchanging ATPase; Neurons; Output; Peripheral; Pharmacology; Phosphotransferases; Physiologic pulse; Physiology; Process; Production; Property; Protein Kinase; Rattus; Regulation; Reporting; Research; Rewards; Rodent; Role; Second Messenger Systems; Site; Slice; Structure; Synapses; Synaptic Transmission; Testing; Tissues; Ventral Tegmental Area; Whole-Cell Recordings; behavioral sensitization; desensitization; disability; dopaminergic neuron; drug of abuse; experimental study; falls; goal oriented behavior; improved; induced pluripotent stem cell; inhibitor/antagonist; interest; neuronal excitability; neurophysiology; pleasure; public health relevance; receptor; receptor sensitivity; sensor; transmission process; treatment strategy

DESCRIPTION (provided by applicant): Dopamine release from neurons in the ventral tegmental area (VTA) assists in learning goal-oriented behaviors and mediates the pleasurable aspects of most drugs of abuse. Understanding how the excitability of VTA neurons is regulated by synaptic inputs and membrane properties is crucial if one is to understand how dopamine release is controlled. 5'-Adenosine monophosphate (AMP)-activated protein kinase (AMPK) is a master enzyme that regulates cellular metabolism. When activated by a falling AMP/ATP ratio, AMPK promotes biochemical pathways that increase energy production while reducing energy expenditure. Although AMPK is widely regarded as an energy sensor, recent studies suggest it also influences neuronal excitability. Preliminary data from our lab suggest that activators of AMPK potentiate the hyperpolarizing current evoked by ATP-sensitive K+ (K-ATP) channels, reduce the desensitization of dopamine D2 autoreceptors, and inhibit the influence of excitatory synaptic transmission in VTA neurons. The over-arching hypothesis of our proposed studies is that AMPK activation augments inhibitory influences on VTA neurons. Patch pipettes will be used to record whole-cell currents and potentials in single VTA neurons in slices of rat midbrain. Western immunoblot will be used to quantify levels of phosphorylated and total AMPK in midbrain slices that have been incubated in the presence and absence of AMPK activators and/or inhibitors. Aim #1 will characterize the effect of AMPK activators on currents evoked by the K-ATP opener diazoxide. Aim #2 will investigate second messenger systems and identify transmitter receptors that mediate the ability of AMPK activators to reduce dopamine D2 autoreceptor desensitization. Aim #3 will investigate mechanisms and sites of action by which AMPK inhibits glutamate-mediated synaptic transmission in the VTA. Aim #4 will characterize mechanisms by which AMPK activation inhibits burst firing in VTA dopamine neurons. Results of these studies may suggest new pharmacological strategies for treating dopamine-dependent disorders.

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