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前额叶多巴胺升高会干扰雌性大鼠行为控制的应激缓冲特性。

Elevated prefrontal dopamine interferes with the stress-buffering properties of behavioral control in female rats.

机构信息

Department of Psychology and Neuroscience, Center for Neuroscience, University of Colorado Boulder, Boulder, CO, USA.

出版信息

Neuropsychopharmacology. 2023 Feb;48(3):498-507. doi: 10.1038/s41386-022-01443-w. Epub 2022 Sep 8.

Abstract

Stress-linked disorders are more prevalent in women than in men and differ in their clinical presentation. Thus, investigating sex differences in factors that promote susceptibility or resilience to stress outcomes, and the circuit elements that mediate their effects, is important. In male rats, instrumental control over stressors engages a corticostriatal system involving the prelimbic cortex (PL) and dorsomedial striatum (DMS) that prevent many of the sequelae of stress exposure. Interestingly, control does not buffer against stress outcomes in females, and here, we provide evidence that the instrumental controlling response in females is supported instead by the dorsolateral striatum (DLS). Additionally, we used in vivo microdialysis, fluorescent in situ hybridization, and receptor subtype pharmacology to examine the contribution of prefrontal dopamine (DA) to the differential impact of behavioral control. Although both sexes preferentially expressed D1 receptor mRNA in PL GABAergic neurons, there were robust sex differences in the dynamic properties of prefrontal DA during controllable stress. Behavioral control potently attenuated stress-induced DA efflux in males, but not females, who showed a sustained DA increase throughout the entire stress session. Importantly, PL D1 receptor blockade (SCH 23390) shifted the proportion of striatal activity from the DLS to the DMS in females and produced the protective effects of behavioral control. These findings suggest a sex-selective mechanism in which elevated DA in the PL biases instrumental responding towards prefrontal-independent striatal circuitry, thereby eliminating the protective impact of coping with stress.

摘要

应激相关障碍在女性中比男性更为普遍,且其临床表现也存在差异。因此,研究促进应激易感性或应激适应的性别差异因素,以及介导这些因素的回路元件,是很重要的。在雄性大鼠中,对压力源的工具性控制会激活涉及额前皮质(PL)和背内侧纹状体(DMS)的皮质纹状体系统,从而防止许多应激暴露的后果。有趣的是,控制并不能缓冲女性的应激后果,而在这里,我们提供的证据表明,女性的工具性控制反应是由背外侧纹状体(DLS)支持的。此外,我们使用活体微透析、荧光原位杂交和受体亚型药理学来研究前额叶多巴胺(DA)对行为控制的不同影响的贡献。尽管两性都优先在 PL 中的 GABA 能神经元中表达 D1 受体 mRNA,但在前额叶 DA 的动态特性方面存在显著的性别差异。行为控制有力地减弱了雄性的应激诱导的 DA 外排,但对雌性没有,雌性在整个应激过程中显示出持续的 DA 增加。重要的是,PL D1 受体阻断(SCH 23390)将纹状体活动的比例从 DLS 转移到了雌性的 DMS,并产生了行为控制的保护作用。这些发现表明存在一种性别选择性机制,其中 PL 中的升高的 DA 使工具性反应偏向于与前额叶无关的纹状体回路,从而消除了应对应激的保护作用。

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