Ventral striatal islands of Calleja neurons control grooming in mice.

Ventral striatal islands of Calleja neurons control grooming in mice.
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DOI:
10.1038/s41593-021-00952-z
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发表时间:
2021-12
影响因子:
25
通讯作者:
Ma M
Ma M
中科院分区:
医学1区
文献类型:
--
作者:
Zhang YF;Vargas Cifuentes L;Wright KN;Bhattarai JP;Mohrhardt J;Fleck D;Janke E;Jiang C;Cranfill SL;Goldstein N;Schreck M;Moberly AH;Yu Y;Arenkiel BR;Betley JN;Luo W;Stegmaier J;Wesson DW;Spehr M;Fuccillo MV;Ma M

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纹状体包括多个分支和不同控制运动输出的神经回路。Calleja岛(IC)包含位于腹侧纹状体的密集堆积的颗粒细胞簇,主要分布在嗅结节(OT)中。IC的特点是表达D3多巴胺受体,在进化上是保守的,但功能不明确。本研究表明,光遗传学激活的OT D3神经元在抑制其他正在进行的行为的同时,有力地启动了小鼠的自我梳理。相反,光遗传抑制这些神经元停止正在进行的梳理,遗传消融减少自发梳理。此外,在梳理毛发之前和过程中,OT D3神经元的活动增加,并通过与邻近的OT神经元(主要是脊髓投射神经元,spn)的突触连接影响局部纹状体输出,其放电速率显示与梳理相关的调节。我们的研究揭示了腹侧纹状体IC在调节运动输出中的新作用,并对梳理的神经控制具有重要意义。
The striatum comprises multiple subdivisions and neural circuits that differentially control motor output. The islands of Calleja (IC) contain clusters of densely-packed granule cells situated in the ventral striatum, predominantly in the olfactory tubercle (OT). Characterized by expression of the D3 dopamine receptor, the IC are evolutionally conserved, but have undefined functions. Here we show that optogenetic activation of OT D3 neurons robustly initiates self-grooming in mice while suppressing other ongoing behaviors. Conversely, optogenetic inhibition of these neurons halts ongoing grooming, and genetic ablation reduces spontaneous grooming. Furthermore, OT D3 neurons show increased activity before and during grooming and influence local striatal output via synaptic connections with neighboring OT neurons (primarily spiny projection neurons, SPNs), whose firing rates display grooming-related modulation. Our study uncovers a novel role of the ventral striatum’s IC in regulating motor output and has important implications for the neural control of grooming.
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