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Science:研究发现暴食症的开关

2017-05-31 佚名 生物360

研究人员在小鼠脑中发现了一个神经元亚组,后者在被激活时会立即触发暴食样进食行为。此外,长时间反复刺激这些神经元会令小鼠体重增加。未定带(ZI)是脑中的一个研究相对不足的部位。有趣的是,为治疗运动障碍而接受丘脑底部(这里包括 ZI)深度刺激的病人会表现出暴食特征。为了更加详尽地探索这一现象,Xiaobing Zhang 和 Anthony N. van den Pol 用光基因法来标记小鼠 ZIs

研究人员在小鼠脑中发现了一个神经元亚组,后者在被激活时会立即触发暴食样进食行为。此外,长时间反复刺激这些神经元会令小鼠体重增加。未定带(ZI)是脑中的一个研究相对不足的部位。有趣的是,为治疗运动障碍而接受丘脑底部(这里包括 ZI)深度刺激的病人会表现出暴食特征。为了更加详尽地探索这一现象,Xiaobing Zhang 和 Anthony N. van den Pol 用光基因法来标记小鼠 ZIs 中的 GABA 神经元。他们发现,刺激轴突伸入丘脑室旁核(PVT)内的 ZI GABA 神经元会立刻(即在刺激后 2 - 3 秒钟)触发暴食样进食行为。在持续刺激 ZI GABA 的 10 分钟内,小鼠会快速吃掉其 35% 的每日储备的高脂食物,这些食物原本应在 24 小时中被摄食。研究人员还发现,胃饥饿素可兴奋 ZI GABA 神经元;胃饥饿素是一种激素,它会发出肠道内能量状态下降的信号。在为期 2 周的时间中,每 3 小时刺激 ZI 神经元亚组 5 分钟,小鼠会显着增加其摄食量并致体重增加,然而,一旦光刺激结束,与对照相比,小鼠会表现出摄食量的显着减少。最后,作者发现,刺激从旁丘脑下核至 PVT 的兴奋性轴突,或直接刺激 PVT 中的谷氨酸神经元都能减少小鼠对食物的摄取。


原始出处:

Zhang X1, van den Pol AN2. Rapid binge-like eating and body weight gain driven by zona incerta GABA neuron activation. Science. 2017 May 26;356(6340):853-859. doi: 10.1126/science.aam7100.

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    2017-06-02 jichang
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    2017-05-31 杨筱荷

    学习啦! 谢谢分享!^_^

    0

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