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相关概念视频

Regulation of Food Intake01:30

Regulation of Food Intake

138
Short-term regulation of food intake primarily involves neural signals from the gastrointestinal (GI) tract, blood nutrient levels, and GI tract hormones. Communication between the gut and brain via vagal nerve fibers plays a significant role in evaluating the contents of the gut. Clinical studies have shown that protein ingestion produces a more prolonged response in these nerve fibers compared to an equivalent amount of glucose. Additionally, the activation of stretch receptors caused by GI...
138
Antidepressant Drugs: MAOIs and Other Agents01:23

Antidepressant Drugs: MAOIs and Other Agents

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Atypical antidepressants, including bupropion (Wellbutrin), mirtazapine (Remeron), nefazodone (Serzone), trazodone (Desyrel), and vilazodone (Viibryd), offer unique mechanisms of action. Bupropion weakly inhibits dopamine and norepinephrine reuptake, aiding depression treatment and smoking cessation, with a low risk of sexual dysfunction. Mirtazapine enhances serotonin and norepinephrine neurotransmission, leading to sedation, increased appetite, and weight gain. As a result, it helps treat...
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Drugs Affecting Neurotransmitter Release or Uptake01:21

Drugs Affecting Neurotransmitter Release or Uptake

834
Certain drugs can affect how neurotransmitters called catecholamines, are released or taken back up in the adrenergic neuron. They can have different effects on the body's sympathetic transmission. Reserpine, a natural compound found in the Rauwolfia shrub, blocks a transporter called vesicular monoamine transporter (VMAT), which leads to a buildup of catecholamines in the cell and reduces sympathetic transmission. Another drug called guanethidine works in multiple ways, including blocking...
834
Desensitization and Tachyphylaxis01:20

Desensitization and Tachyphylaxis

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Tachyphylaxis is described as a rapid decrease in response to a drug after repeated or continuous administration of the same drug dose. It is a phenomenon where the body becomes less responsive to a particular substance or intervention over time, requiring higher doses or stronger interventions to achieve the same effect. It results from adaptive changes in the body's receptors, signaling pathways, or physiological processes that occur in response to prolonged exposure to a stimulus.
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Drugs Affecting Neurotransmitter Synthesis01:29

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Drugs affecting neurotransmitter synthesis can impact the adrenergic neuron and the synthesis of neurotransmitters. For example, α-methyltyrosine and carbidopa target specific enzymes involved in catecholamine synthesis. α-methyltyrosine inhibits the enzyme tyrosine hydroxylase, which converts tyrosine into dopamine. By blocking this enzyme, α-methyltyrosine reduces dopamine production and other catecholamines. Carbidopa, on the other hand, inhibits the enzyme dopa decarboxylase,...
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Drug Abuse and Addiction: Pharmacological Phenomena01:15

Drug Abuse and Addiction: Pharmacological Phenomena

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Drug dependence, abuse, and addiction are complex phenomena that can precipitate various abnormal states. Physical dependence refers to a state of pharmacological adaptation to a drug. This adaptation often results in tolerance—a reduced response to the drug after repeated administrations. When the drug use is abruptly stopped, withdrawal symptoms occur due to the body's need to readjust from the pharmacologically induced imbalance. However, tolerance and withdrawal symptoms do not...
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相关实验视频

Updated: May 7, 2025

Control of Eating Behavior Using a Novel Feedback System
04:48

Control of Eating Behavior Using a Novel Feedback System

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一个大脑的奖励回路被下一代减肥药物抑制.

Elizabeth N Godschall, Taha Bugra Gungul, Isabelle R Sajonia

    bioRxiv : the preprint server for biology
    |January 7, 2025
    PubMed
    概括

    新的小分子葡萄糖类-1受体激动剂 (GLP1RAs) 向大脑电路以控制食欲. 这些药物调节了代谢和奖励驱动的食行为,为肥胖和成治疗提供了潜在的机会.

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    Studying Food Reward and Motivation in Humans
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    相关实验视频

    Last Updated: May 7, 2025

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    12:09

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    Fat Preference: A Novel Model of Eating Behavior in Rats
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    科学领域:

    • 神经科学是一个神经科学.
    • 药理学 药理学是指药理学的学科.
    • 代谢疾病 代谢疾病

    背景情况:

    • 类似葡萄糖-1受体激动剂 (GLP1RAs) 对于减肥是有效的,但通常需要注射.
    • 小分子GLP1RAs提供口服生物可用性和可扩展的制造,但缺乏详细的机制理解.
    • 小分子GLP1RA对养的影响背后的神经回路在很大程度上是未定义的.

    研究的目的:

    • 研究小分子GLP1RAs调节养行为的神经机制.
    • 为了比较小分子GLP1RAs与基于的GLP1RAs的神经电路参与.
    • 确定小分子GLP1RAs准的特定大脑区域和途径.

    主要方法:

    • 开发了人性化的GLP1R小鼠模型.
    • 整合基因操纵,成像和行为分析.
    • 对神经活动和多巴胺释放的分析,以响应小分子GLP1RAs.

    主要成果:

    • 小分子GLP1RAs通过不同的神经回路调节家庭静止和享乐的养.
    • GLP1RAs激活了中枢杏仁体的神经元,通过核中的多巴胺调节抑制了可口的食物摄入.
    • 准中央杏仁体中的GLP1受体特别影响奖励驱动的养.

    结论:

    • 小分子GLP1RAs在中枢杏仁体中激活专门的神经回路,以调节奖励处理和享乐性食.
    • 这些发现揭示了小分子GLP1RAs的一个新机制,与标准途径不同.
    • 小分子GLP1RAs对涉及失调多巴胺信号的疾病具有治疗潜力,例如物质使用障碍和过度饮食.