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The effects of restraint stress on nociceptive responses induced by formalin injected in rat's TMJ.

机译:约束应激对注射TMJ大鼠福尔马林所致伤害感受性反应的影响。

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摘要

It has been reported that stress can alter nociception from superficial tissues, such as skin and subcutaneous region. However, the influence of stress on an experimental deep nociception model is not understood. In this study, the temporomandibular joint (TMJ) formalin test was used to evaluate the effects of acute and chronic restraint stress on nociceptive responses in rats. Animals were initially submitted to one session of acute restraint stress (1 h) or exposed to chronic stress (40 days-1 h/day). Then, animals were killed immediately to collect blood for hormonal determinations by radioimmunoassay, or submitted to the TMJ formalin test to evaluate nociception. Rats submitted to acute restraint presented a performance similar to unstressed controls in the TMJ formalin test, whereas chronically stressed rats showed an increase in nociceptive responses. After 40 days of restraint, morphine was injected i.p. (1, 5 mg/kg or saline). The stressed rats displayed decreased morphine effects on nociception compared to unstressed controls. These findings suggest that repeated stress can produce hyperalgesia, which is, at least in part, due to alterations in the activity of opioid systems. This model may help elucidate the underlying neural mechanisms that mediate the effects of repeated stress on orofacial pain.
机译:据报道,压力可以改变诸如皮肤和皮下区域等浅表组织的伤害感受。但是,尚不清楚应力对实验性深伤害感受模型的影响。在这项研究中,颞下颌关节(TMJ)福尔马林试验用于评估急性和慢性约束应激对大鼠伤害感受反应的影响。最初,使动物接受一次急性束缚应激(1 h)或暴露于慢性应激(40天-1 h /天)。然后,立即杀死动物以通过放射免疫测定收集血液以进行激素测定,或接受TMJ福尔马林测试以评估伤害感受。在TMJ福尔马林测试中,受到急性约束的大鼠表现出与未受压力的对照相似的表现,而长期受应激的大鼠则表现出伤害感受反应的增强。束缚40天后,腹腔注射吗啡。 (1,5 mg / kg或盐水)。与未受压的对照组相比,受压的大鼠对伤害感受的吗啡作用降低。这些发现表明,反复的压力可以产生痛觉过敏,这至少部分是由于阿片类药物系统活性的改变。该模型可以帮助阐明潜在的神经机制,该机制介导反复压力对口面部疼痛的影响。

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