Cannabis Sativa targets mediobasal hypothalamic neurons to stimulate appetite.

Cannabis Sativa targets mediobasal hypothalamic neurons to stimulate appetite.
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大麻Sativa的目标是下丘脑底内侧神经元,以刺激食欲。

DOI:
10.1038/s41598-023-50112-5
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发表时间:
2023-12-27
期刊:
影响因子:
4.6
通讯作者:
--
中科院分区:
综合性期刊3区
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--
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调节大麻食欲刺激特性的神经生物学机制尚未解决。这项工作检验了这样的假设:下丘脑内侧 (MBH) 中表达大麻素 1 受体 (CB1R) 的神经元在吸入大麻蒸气后调节食欲增加。在这里,我们利用了一种范例,将汽化的大麻植物物质被动地施用于啮齿动物。对大鼠的初步研究描述了暴露于空气或蒸气大麻后的膳食模式和对可口食物的操作反应。在小鼠身上进行的研究结合了体内光学成像、电生理学和化学遗传学操作,以确定 MBH 神经元对大麻诱导的进食行为的重要性。我们的数据表明,大麻蒸气增加了进餐频率和寻找食物的行为,而不会改变运动活动。重要的是,当小鼠预期或消耗食物时,我们观察到不同神经元群内的 MBH 活性增强。机制实验表明,CB1R 的药理学激活减弱了 MBH 内饥饿促进 Agouti 相关肽 (AgRP) 神经元的抑制性突触张力。最后,AgRP 神经元的化学遗传学抑制减弱了大麻蒸气的食欲促进作用。根据这些结果,我们得出结论,MBH 神经元有助于吸入大麻的食欲刺激特性。
The neurobiological mechanisms that regulate the appetite-stimulatory properties of cannabis sativa are unresolved. This work examined the hypothesis that cannabinoid-1 receptor (CB1R) expressing neurons in the mediobasal hypothalamus (MBH) regulate increased appetite following cannabis vapor inhalation. Here we utilized a paradigm where vaporized cannabis plant matter was administered passively to rodents. Initial studies in rats characterized meal patterns and operant responding for palatable food following exposure to air or vapor cannabis. Studies conducted in mice used a combination of in vivo optical imaging, electrophysiology and chemogenetic manipulations to determine the importance of MBH neurons for cannabis-induced feeding behavior. Our data indicate that cannabis vapor increased meal frequency and food seeking behavior without altering locomotor activity. Importantly, we observed augmented MBH activity within distinct neuronal populations when mice anticipated or consumed food. Mechanistic experiments demonstrated that pharmacological activation of CB1R attenuated inhibitory synaptic tone onto hunger promoting Agouti Related Peptide (AgRP) neurons within the MBH. Lastly, chemogenetic inhibition of AgRP neurons attenuated the appetite promoting effects of cannabis vapor. Based on these results, we conclude that MBH neurons contribute to the appetite stimulatory properties of inhaled cannabis.
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发表时间: 2022-03-09
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