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新生儿膀胱炎症改变了急性足底电击应激引起的成年雌性大鼠中枢杏仁核在超敏反应中的作用。

Neonatal bladder inflammation alters the role of the central amygdala in hypersensitivity produced by Acute Footshock stress in adult female rats.

机构信息

Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham, Birmingham, Alabama, United States of America.

Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham, Birmingham, Alabama, United States of America.

出版信息

Brain Res. 2018 Nov 1;1698:99-105. doi: 10.1016/j.brainres.2018.06.030. Epub 2018 Jun 30.

Abstract

There is increasing evidence that chronic pain may be associated with events that occur during critical periods of development. Recent studies have identified behavioral, spinal neurophysiological and spinal/peripheral neurochemical differences in rats that have experienced neonatal bladder inflammation (NBI): a putative model of the chronically painful bladder disorder, interstitial cystitis. Stress has been shown to exacerbate symptoms of interstitial cystitis and produces bladder hypersensitivity in animal models. We recently reported that Acute Footshock-induced bladder hypersensitivity was eliminated in otherwise normal rats by prior bilateral lesions of the central nucleus of the amygdala. Since the spinal and peripheral nervous systems of NBI-treated rats are known to differ from normal rats, the present experiments sought to determine whether a supraspinal nervous system structure, the central amygdala, is still necessary for the induction of Acute Footshock-induced hypersensitivity. The effect of bilateral amygdala electrolytic lesions on Acute Footshock-induced bladder hypersensitivity in adult female rats was tested in Control rats which underwent a control protocol as neonates and in experimental rats which experienced NBI. Consistent with our previous report, in Control rats, Acute Footshock-induced bladder hypersensitivity was eliminated by bilateral Amygdala Lesions. In contrast, Acute Footshock-induced bladder hypersensitivity in NBI-treated rats was unaffected by bilateral Amygdala Lesions. These findings provide evidence that NBI results in the recruitment of substrates of bladder hypersensitivity that may differ from those of normal rats. This, in turn, suggests that unique therapeutics may be needed for painful bladder disorders like interstitial cystitis.

摘要

越来越多的证据表明,慢性疼痛可能与发育关键期发生的事件有关。最近的研究在经历过新生儿膀胱炎症(NBI)的大鼠中发现了行为、脊髓神经生理学和脊髓/周围神经化学方面的差异:这是慢性疼痛性膀胱疾病间质性膀胱炎的一个假定模型。压力已被证明会加重间质性膀胱炎的症状,并在动物模型中产生膀胱过敏。我们最近报告说,急性足底电击引起的膀胱过敏在其他正常大鼠中通过双侧杏仁核中央核损伤而消除。由于 NBI 处理大鼠的脊髓和周围神经系统已知与正常大鼠不同,因此本实验旨在确定中枢神经系统结构——杏仁核中央核是否仍然是诱导急性足底电击引起的过敏的必要条件。在接受 NBI 的实验大鼠和经历过 NBI 的实验大鼠中,测试了双侧杏仁核电解损伤对成年雌性大鼠急性足底电击引起的膀胱过敏的影响。与我们之前的报告一致,在对照组大鼠中,急性足底电击引起的膀胱过敏通过双侧杏仁核损伤消除。相比之下,NBI 处理大鼠的急性足底电击引起的膀胱过敏不受双侧杏仁核损伤的影响。这些发现为 NBI 导致招募不同于正常大鼠的膀胱过敏底物提供了证据。这反过来又表明,对于间质性膀胱炎等疼痛性膀胱疾病,可能需要独特的治疗方法。

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