A D2 to D1 shift in dopaminergic inputs to midbrain 5-HT neurons causes anorexia in mice.

A D2 to D1 shift in dopaminergic inputs to midbrain 5-HT neurons causes anorexia in mice.
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DOI:
10.1038/s41593-022-01062-0
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发表时间:
2022-05
影响因子:
25
通讯作者:
Xu, Yong
Xu, Yong
中科院分区:
医学1区
文献类型:
--
作者:
Cai, Xing;Liu, Hailan;Feng, Bing;Yu, Meng;He, Yang;Liu, Hesong;Liang, Chen;Yang, Yongjie;Tu, Longlong;Zhang, Nan;Wang, Lina;Yin, Na;Han, Junying;Yan, Zili;Wang, Chunmei;Xu, Pingwen;Wu, Qi;Tong, Qingchun;He, Yanlin;Xu, Yong

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中脑多巴胺(DA)和5-羟色胺(5-HT)神经元调节动机行为,包括进食,但对这些回路如何相互作用知之甚少。在本研究中,我们发现,小鼠腹侧被盖区的DA神经元双向调节中缝背核(DRN)的5-HT神经元的活动,较弱的刺激引起DRD 2依赖的抑制和过食,而较强的刺激引起DRD 1依赖的激活和厌食。此外,在基于活动的厌食症(阿坝)的范例,这是一个小鼠模型模仿人类神经性厌食症(AN)的一些临床特征,我们观察到DRD 2到DRD 1的5-HTDRN神经元上的DA神经传递的转变,这导致这些神经元的不断激活,并有助于AN样行为。最后,我们发现,DRD 1拮抗剂的全身给药可以防止厌食和体重减轻阿坝。我们的研究结果表明,DA和5-HT神经元之间的刺激强度依赖性相互作用的摄食行为的调节,这可能有助于AN的病理生理。
Midbrain dopamine (DA) and serotonin (5-HT) neurons regulate motivated behaviors, including feeding, but less is known about how these circuits may interact. In this study, we found that DA neurons in the mouse ventral tegmental area bidirectionally regulate the activity of 5-HT neurons in the dorsal raphe nucleus (DRN), with weaker stimulation causing DRD2-dependent inhibition and overeating, while stronger stimulation causing DRD1-dependent activation and anorexia. Furthermore, in the activity-based anorexia (ABA) paradigm, which is a mouse model mimicking some clinical features of human anorexia nervosa (AN), we observed a DRD2 to DRD1 shift of DA neurotransmission on 5-HTDRN neurons, which causes constant activation of these neurons and contributes to AN-like behaviors. Finally, we found that systemic administration of a DRD1 antagonist can prevent anorexia and weight loss in ABA. Our results revealed regulation of feeding behavior by stimulation strength-dependent interactions between DA and 5-HT neurons, which may contribute to the pathophysiology of AN.
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