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应激源控制与大脑局部炎症反应:外侧杏仁核的调节作用。

Stressor control and regional inflammatory responses in the brain: regulation by the basolateral amygdala.

机构信息

Sleep Research Laboratory, Eastern Virginia Medical School, P.O. Box 1980, Norfolk, VA, 23507, USA.

Center for Integrative Neuroscience and Inflammatory Diseases, Eastern Virginia Medical School, P.O. Box 1980, Norfolk, VA, 23507, USA.

出版信息

J Neuroinflammation. 2023 May 27;20(1):128. doi: 10.1186/s12974-023-02813-x.

Abstract

Increasing evidence has connected the development of certain neuropsychiatric disorders, as well as neurodegenerative diseases, to stress-induced dysregulation of the immune system. We have shown that escapable (ES) and inescapable (IS) footshock stress, and memories associated with ES or IS, can differentially alter inflammatory-related gene expression in brain in a region dependent manner. We have also demonstrated that the basolateral amygdala (BLA) regulates stress- and fear memory-induced alterations in sleep, and that differential sleep and immune responses in the brain to ES and IS appear to be integrated during fear conditioning and then reproduced by fear memory recall. In this study, we investigated the role of BLA in influencing regional inflammatory responses within the hippocampus (HPC) and medial prefrontal cortex (mPFC) by optogenetically stimulating or inhibiting BLA in male C57BL/6 mice during footshock stress in our yoked shuttlebox paradigm based on ES and IS. Then, mice were immediately euthanized and RNA extracted from brain regions of interest and loaded into NanoString® Mouse Neuroinflammation Panels for compilation of gene expression profiles. Results showed differential regional effects in gene expression and activated pathways involved in inflammatory-related signaling following ES and IS, and these differences were altered depending on amygdalar excitation or inhibition. These findings demonstrate that the stress-induced immune response, or "parainflammation", is affected by stressor controllability and that BLA influences regional parainflammation to ES or IS in HPC and mPFC. The study illustrates how stress-induced parainflammation can be regulated at the neurocircuit level and suggests that this approach can be useful for uncovering circuit and immune interactions in mediating differential stress outcomes.

摘要

越来越多的证据表明,某些神经精神疾病以及神经退行性疾病的发展与应激诱导的免疫系统失调有关。我们已经表明,可逃避(ES)和不可逃避(IS)足底电击应激,以及与 ES 或 IS 相关的记忆,可以以依赖于区域的方式差异地改变大脑中与炎症相关的基因表达。我们还表明,基底外侧杏仁核(BLA)调节应激和恐惧记忆引起的睡眠改变,并且 ES 和 IS 对大脑的不同睡眠和免疫反应似乎在恐惧条件作用期间整合,然后通过恐惧记忆回忆再现。在这项研究中,我们通过在我们的基于 ES 和 IS 的偶联穿梭箱范式中,在雄性 C57BL/6 小鼠进行足底电击应激时,用光遗传学刺激或抑制 BLA,研究了 BLA 在影响海马体(HPC)和内侧前额叶皮层(mPFC)内区域炎症反应中的作用。然后,立即将小鼠安乐死,并从大脑感兴趣区域提取 RNA,并加载到 NanoString® Mouse Neuroinflammation Panels 中,以编译基因表达谱。结果表明,ES 和 IS 后,基因表达和参与炎症相关信号的激活途径存在差异的区域效应,并且这些差异取决于杏仁核的兴奋或抑制。这些发现表明,应激诱导的免疫反应或“副炎症”受到应激可控性的影响,并且 BLA 影响 HPC 和 mPFC 中 ES 或 IS 的区域副炎症。该研究说明了应激诱导的副炎症如何在神经回路水平上受到调节,并表明这种方法可用于揭示介导不同应激结果的回路和免疫相互作用。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/79ed/10225081/09351a33a30c/12974_2023_2813_Fig1_HTML.jpg

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