Activation of prodynorphin neurons in the dorsomedial hypothalamus inhibits food intake and promotes positive valence

Activation of prodynorphin neurons in the dorsomedial hypothalamus inhibits food intake and promotes positive valence
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下丘脑背内侧强啡肽神经元的激活抑制食物摄入并促进正价

DOI:
10.1101/2020.07.02.183780
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发表时间:
2020
期刊:
bioRxiv
影响因子:
--
通讯作者:
Toda C.
Toda C.
中科院分区:
--
文献类型:
--
作者:
Imoto D;Yamamoto I;Matsunaga H;Yonekura T;Lee ML;Kato KX;Yamasaki T;Otsuguro K;Horiuchi M;Iijima N;Kimura K;Toda C.

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食物摄入的调节是肥胖等代谢综合征的主要研究领域之一。基因打靶研究已经阐明了下丘脑神经元在摄食行为中的作用。然而,我们对生理条件下神经功能的理解仍然有限。即早基因,如活性调节的细胞因子相关蛋白(Arc/Arg3.1),是神经元活动的有用标记物。在这里,我们研究了Arc/Arg3.1基因表达的神经元在下丘脑再喂养后的作用,使用靶向重组在活动群体的方法。我们确定了在下丘脑背内侧的再喂养反应性强啡肽原/胆囊收缩素神经元,该神经元投射到下丘脑室旁核。这些神经元的化学发生激活减少了食物摄入,促进了正效价。我们的研究结果提供了新发现的享乐神经元在喂养诱导饱腹感的过程中的作用。
The regulation of food intake is one of the major research areas in the study of metabolic syndromes such as obesity. Gene targeting studies have clarified the roles of hypothalamic neurons in feeding behaviour. However, our understanding of neural function under physiological conditions is still limited. Immediate early genes, such as activity-regulated cytoskeleton-associated protein (Arc/Arg3.1), are useful markers of neuronal activity. Here, we investigated the role of Arc/Arg3.1 gene-expressing neurons in the hypothalamus after refeeding using the targeted recombination in active populations method. We identified refeeding-responsive prodynorphin/cholecystokinin neurons in the dorsomedial hypothalamus that project to the paraventricular hypothalamic nucleus. Chemogenetic activation of these neurons decreased food intake and promoted positive valence. Our findings provide insight into the role of newly identified hedonic neurons in the process of feeding-induced satiety.
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