Serotonin engages an anxiety and fear-promoting circuit in the extended amygdala.

Serotonin engages an anxiety and fear-promoting circuit in the extended amygdala.
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DOI:
10.1038/nature19318
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发表时间:
2016-09-01
期刊:
影响因子:
64.8
通讯作者:
Kash, Thomas L.
Kash, Thomas L.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Marcinkiewcz, Catherine A.;Mazzone, Christopher M.;D'Agostino, Giuseppe;Halladay, Lindsay R.;Hardaway, J. Andrew;DiBerto, Jeffrey F.;Navarro, Montserrat;Burnham, Nathan;Cristiano, Claudia;Dorrier, Cayce E.;Tipton, Gregory J.;Ramakrishnan, Charu;Kozicz, Tamas;Deisseroth, Karl;Thiele, Todd E.;McElligott, Zoe A.;Holmes, Andrew;Heisler, Lora K.;Kash, Thomas L.

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血清素(5-羟色胺;5-HT)是一种神经递质,在情绪调节中发挥重要作用。然而,5-HT 协调厌恶状态的精确回路尚未确定。在这里,我们发现来自中缝背核 (5-HTDRN) 的 5-HT 会增强恐惧和焦虑,并激活终纹床核 (CRFBNST) 中的促肾上腺皮质激素释放因子 (CRF) 神经元亚群。具体来说,5-HTDRN 投射到 BNST,通过 5-HT2C 受体 (5-HT2CR) 的作用,参与 CRFBNST 抑制微电路,使抗焦虑 BNST 输出到腹侧被盖区 (VTA) 和外侧下丘脑 (LH)。此外,我们证明这种 CRFBNST 抑制回路是急性暴露于选择性血清素再摄取抑制剂 (SSRI) 后厌恶行为的基础。这种早期厌恶效应是通过促肾上腺皮质激素释放因子 1 型受体 (CRF1R) 介导的,因为 CRF1R 拮抗作用足以防止 SSRI 引起的厌恶学习急性增强。这些结果揭示了控制恐惧和焦虑的重要 5-HTDRN→CRFBNST 回路,并为一些焦虑症患者 SSRI 治疗早期不良事件的临床观察提供了潜在的机制解释。
Serotonin (5-hydroxytryptamine; 5-HT) is a neurotransmitter that has an essential role in the regulation of emotion. The precise circuits through which aversive states are orchestrated by 5-HT, however, have not yet been defined. Here we show that 5-HT from the dorsal raphe nucleus (5-HTDRN) enhances fear and anxiety and activates a subpopulation of corticotropin-releasing factor (CRF) neurons in the bed nucleus of the stria terminalis (CRFBNST). Specifically, 5-HTDRN projections to the BNST, via actions at 5-HT2C receptors (5-HT2CRs), engage a CRFBNST inhibitory microcircuit that silences anxiolytic BNST outputs to the ventral tegmental area (VTA) and lateral hypothalamus (LH). Further, we demonstrate that this CRFBNST inhibitory circuit underlies aversive behavior following acute exposure to selective serotonin reuptake inhibitors (SSRIs). This early aversive effect is mediated via the corticotrophin releasing factor type 1 receptor (CRF1R) given that CRF1R antagonism is sufficient to prevent acute SSRI-induced enhancements in aversive learning. These results reveal an essential 5-HTDRN→CRFBNST circuit governing fear and anxiety and provide a potential mechanistic explanation for the clinical observation of early adverse events to SSRI treatment in some patients with anxiety disorders.
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