Serotonin receptor 4 in the hippocampus modulates mood and anxiety.

Serotonin receptor 4 in the hippocampus modulates mood and anxiety.
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海马体中的血清素受体4调节情绪和焦虑。

DOI:
10.1038/s41380-020-00994-y
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发表时间:
2021-06
影响因子:
11
通讯作者:
Schmidt EF
Schmidt EF
中科院分区:
医学1区
文献类型:
--
作者:
Karayol R;Medrihan L;Warner-Schmidt JL;Fait BW;Rao MN;Holzner EB;Greengard P;Heintz N;Schmidt EF

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5-羟色胺受体4(5-HT 4 R)在调节情绪、焦虑和认知方面起着重要作用,激活该受体的药物在临床前模型中具有快速作用的抗抑郁(AD)样作用。然而,5-HT 4 R在整个中枢神经系统(CNS)和外周广泛表达,因此难以确定其作用背后的细胞类型和回路。因此,我们产生了Cre依赖性5-HT 4 R敲除小鼠系,以剖析5-HT 4 R在特定脑区域和细胞类型中的功能。我们发现,海马兴奋性神经元的功能性5-HT 4 R的丧失导致了强烈的AD样行为反应和基线焦虑的升高。5-HT 4 R是维持齿状回(DG)颗粒细胞的适当兴奋性所必需的,并且细胞类型特异性分子分析揭示了缺乏5-HT 4 R的细胞中正常神经功能和可塑性所必需的基因的失调。这些适应伴随着腹侧,但不是背侧,齿状回的未成熟神经元的数量增加,表明5-HT 4 R损失对当地的细胞环境的广泛影响。这项研究是第一个使用条件遗传靶向来证明海马5-HT 4 R信号在调节情绪和焦虑中的直接作用。我们的研究结果还强调了需要基于细胞类型的方法来阐明神经调节系统对不同神经回路的复杂作用。
Serotonin receptor 4 (5-HT4R) plays an important role in regulating mood, anxiety, and cognition, and drugs that activate this receptor have fast-acting antidepressant (AD)-like effects in preclinical models. However, 5-HT4R is widely expressed throughout the central nervous system (CNS) and periphery, making it difficult to pinpoint the cell types and circuits underlying its effects. Therefore, we generated a Cre-dependent 5-HT4R knockout mouse line to dissect the function of 5-HT4R in specific brain regions and cell types. We show that the loss of functional 5-HT4R specifically from excitatory neurons of hippocampus led to robust AD-like behavioral responses and an elevation in baseline anxiety. 5-HT4R was necessary to maintain the proper excitability of dentate gyrus (DG) granule cells and cell type specific molecular profiling revealed a dysregulation of genes necessary for normal neural function and plasticity in cells lacking 5-HT4R. These adaptations were accompanied by an increase in the number of immature neurons in ventral, but not dorsal, dentate gyrus, indicating a broad impact of 5-HT4R loss on the local cellular environment. This study is the first to use conditional genetic targeting to demonstrate a direct role for hippocampal 5-HT4R signaling in modulating mood and anxiety. Our findings also underscore the need for cell type-based approaches to elucidate the complex action of neuromodulatory systems on distinct neural circuits.
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