幼年大鼠的内侧视前区及其向腹侧被盖区和下uctal灰质周围的投射会因社交游戏行为而被激活。

IF 1.6 4区 医学 Q3 BEHAVIORAL SCIENCES Behavioral neuroscience Pub Date : 2023-08-01 Epub Date: 2023-03-06 DOI:10.1037/bne0000555
Changjiu Zhao, Lauren V Riters
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引用次数: 0

摘要

内侧视前区(MPOA)因其在性行为和母性行为中的作用而广为人知。该区域在生殖环境之外的附属社会行为中也发挥着重要作用。我们最近证明,MPOA 是阿片类物质支配青春期大鼠高回报社会游戏行为的中心核。然而,MPOA 介导社交游戏的神经回路机制在很大程度上仍未得到解决。我们假设 MPOA 连接了一个互补的神经系统,通过该系统,社交游戏可以通过向腹侧被盖区(VTA)的投射诱导奖赏,并通过向uctal 灰色周围(PAG)的投射减轻负性情绪状态。为了测试这两条投射通路是否会在社交游戏行为中被激活,我们将逆行束追踪与即时早期基因(IEG)表达和免疫荧光标记结合起来,以确定从MPOA到VTA和PAG的阿片类敏感投射通路,这些通路在进行社交游戏后被激活。向 VTA 或 PAG 显微注射逆行示踪剂氟金(FG)。评估了IEG(即Egr1)的表达,并在社交游戏后对MPOA中的μ阿片受体(MOR)、Egr1和FG进行了三重免疫荧光标记。我们发现,与不玩耍的大鼠相比,玩耍动物MPOA中Egr1 + FG双重标记和MOR + Egr1 + FG三重标记的神经元增加,这些神经元投射到VTA和PAG。社交游戏后,表达 MORs 的投射神经元从 MPOA 向 VTA 或 PAG 的激活增加,这表明阿片类药物可能通过这些投射通路来控制社交游戏。(PsycInfo Database Record (c) 2023 APA, 版权所有)。
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The medial preoptic area and its projections to the ventral tegmental area and the periaqueductal gray are activated in response to social play behavior in juvenile rats.

The medial preoptic area (MPOA) is well known for its role in sexual and maternal behaviors. This region also plays an important role in affiliative social behaviors outside reproductive contexts. We recently demonstrated that the MPOA is a central nucleus in which opioids govern highly rewarding social play behavior in adolescent rats. However, the neural circuit mechanisms underlying MPOA-mediated social play remain largely unresolved. We hypothesized that the MPOA unites a complementary neural system through which social play induces reward via a projection to the ventral tegmental area (VTA) and reduces a negative affective state through a projection to the periaqueductal gray (PAG). To test whether the two projection pathways are activated in response to social play behavior, we combined retrograde tract tracing with immediate early gene (IEG) expression and immunofluorescent labeling to identify opioid-sensitive projection pathways from the MPOA to VTA and PAG that are activated after performance of social play. Retrograde tracer, fluoro-gold (FG), was microinjected into the VTA or PAG. IEG expression (i.e., Egr1) was assessed and triple immunofluorescent labeling for mu opioid receptor (MOR), Egr1, and FG in the MPOA was performed after social play. We revealed that play animals displayed an increase in neurons double labeled for Egr1 + FG and triple labeled for MOR + Egr1 + FG in the MPOA projecting to both the VTA and PAG when compared to no-play rats. The increased activation of projection neurons that express MORs from MPOA to VTA or PAG after social play suggests that opioids may act through these projection pathways to govern social play. (PsycInfo Database Record (c) 2023 APA, all rights reserved).

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来源期刊
Behavioral neuroscience
Behavioral neuroscience 医学-行为科学
CiteScore
3.40
自引率
0.00%
发文量
51
审稿时长
6-12 weeks
期刊介绍: Behavioral Neuroscience publishes original research articles as well as reviews in the broad field of the neural bases of behavior.
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