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急性或重复应激后内脏痛觉过敏中小鼠杏仁核糖皮质激素受体的差异参与。

Differential involvement of amygdala corticosteroid receptors in visceral hyperalgesia following acute or repeated stress.

机构信息

Oklahoma Center for Neuroscience, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, USA.

出版信息

Am J Physiol Gastrointest Liver Physiol. 2012 Jan 15;302(2):G260-6. doi: 10.1152/ajpgi.00353.2011. Epub 2011 Nov 3.


DOI:10.1152/ajpgi.00353.2011
PMID:22052012
Abstract

Symptoms of irritable bowel syndrome (IBS) are exacerbated by stress. Previously, we demonstrated that the stress hormone corticosterone applied directly to the amygdala induced visceral hypersensitivity through the actions of glucocorticoid receptor (GR) and mineralocorticoid receptor (MR). However, the involvement of amygdaloid GR and MR in the regulation of visceral sensitivity following psychological stress is unknown; therefore, the goal of the present study was to determine the relative importance of amygdaloid GR and MR in the regulation of visceral sensitivity in a rodent model of behavioral stress. Male F-344 rats were stereotaxically implanted with micropellets bilaterally on the dorsal margin of the amygdala containing the GR antagonist mifepristone, the MR antagonist spironolactone, or cholesterol as a control. Animals were then exposed to 1 h of water-avoidance stress (WAS) or sham stress for 1 day (acute) or 7 days (repeated). Visceral sensitivity was assessed either 1 h or 24 h after the final session of WAS and quantified as the number of contractions of the external abdominal oblique, a visceromotor response, in response to colorectal distension at pressures of 0-60 mmHg. Acute stress induced transient visceral hyperalgesia, which was absent 24 h after WAS and independent of GR and MR. Conversely, repeated WAS induced sustained visceral hyperalgesia that was abolished by specifically targeting the amygdala with GR and MR antagonists. These results demonstrate that the amygdala corticosteroid system plays an essential role in mediating the effects of repeated WAS on visceral sensitivity. Furthermore, our findings suggest that amygdaloid GR and MR may be involved in IBS symptomatology.

摘要

肠易激综合征(IBS)的症状会因压力而加重。此前,我们已经证明,直接施加于杏仁核的应激激素皮质酮通过糖皮质激素受体(GR)和盐皮质激素受体(MR)的作用诱导内脏敏感性。然而,杏仁核 GR 和 MR 在心理应激后内脏敏感性的调节中的作用尚不清楚;因此,本研究的目的是确定杏仁核 GR 和 MR 在行为应激的啮齿动物模型中对内脏敏感性调节的相对重要性。雄性 F-344 大鼠被立体定向双侧植入含有 GR 拮抗剂米非司酮、MR 拮抗剂螺内酯或胆固醇作为对照的微球于杏仁核背缘。然后,动物暴露于 1 小时的避水应激(WAS)或假应激 1 天(急性)或 7 天(重复)。在 WAS 的最后一次会话后 1 小时或 24 小时评估内脏敏感性,并通过对外侧腹斜肌的收缩次数进行量化,这是对直肠扩张至 0-60mmHg 时的内脏运动反应。急性应激诱导短暂的内脏痛觉过敏,在 WAS 后 24 小时消失且与 GR 和 MR 无关。相反,重复的 WAS 诱导持续的内脏痛觉过敏,用 GR 和 MR 拮抗剂特异性靶向杏仁核可以消除这种过敏。这些结果表明,杏仁核皮质激素系统在介导重复 WAS 对内脏敏感性的影响中起关键作用。此外,我们的发现表明,杏仁核 GR 和 MR 可能与 IBS 症状有关。

相似文献

[1]
Differential involvement of amygdala corticosteroid receptors in visceral hyperalgesia following acute or repeated stress.

Am J Physiol Gastrointest Liver Physiol. 2011-11-3

[2]
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[3]
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[4]
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[5]
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[6]
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[7]
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[8]
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[9]
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[10]
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引用本文的文献

[1]
A review of neuroendocrine immune system abnormalities in IBS based on the brain-gut axis and research progress of acupuncture intervention.

Front Neurosci. 2023-3-9

[2]
Electrophysiology as a Tool to Decipher the Network Mechanism of Visceral Pain in Functional Gastrointestinal Disorders.

Diagnostics (Basel). 2023-2-8

[3]
Upregulation of Netrin-1 in the hippocampus mediates the formation of visceral hypersensitivity induced by maternal separation.

Front Mol Neurosci. 2022-7-28

[4]
Inhibition of Serine Proteases as a Novel Therapeutic Strategy for Abdominal Pain in IBS.

Front Physiol. 2022-5-19

[5]
Importance of Non-pharmacological Approaches for Treating Irritable Bowel Syndrome: Mechanisms and Clinical Relevance.

Front Pain Res (Lausanne). 2021-1-21

[6]
Spinal neurochemical mechanisms of acute stress-induced visceral hypersensitivity in healthy rats.

Neurosci Lett. 2022-1-23

[7]
An enriched environment reduces chronic stress-induced visceral pain through modulating microglial activity in the central nucleus of the amygdala.

Am J Physiol Gastrointest Liver Physiol. 2022-2-1

[8]
Stress-induced visceral pain in female rats is associated with epigenetic remodeling in the central nucleus of the amygdala.

Neurobiol Stress. 2021-9-20

[9]
Environmental enrichment prevents stress-induced epigenetic changes in the expression of glucocorticoid receptor and corticotrophin releasing hormone in the central nucleus of the amygdala to inhibit visceral hypersensitivity.

Exp Neurol. 2021-11

[10]
Inhibition of Microglial Activation in the Amygdala Reverses Stress-Induced Abdominal Pain in the Male Rat.

Cell Mol Gastroenterol Hepatol. 2020

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