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Tricyclic antidepressants have been shown to be useful for the treatment of pain of varying etiology. Monoaminergic systems seem to be implicated in this phenomenon. In this study, the influence of the selective beta 1- (CGP 20712A) and beta 2- (ICI 118551) adrenergic blockers on the antinociceptive effect of desipramine and nortriptyline was studied in mice using physical and chemical nociceptive tests that implicate different levels of sensory-motor integration in the central nervous system (CNS). An activity test was performed to detect "false positive" or "false negative" results. Results obtained show that both CGP 20712A and ICI 118551 are able to antagonize the antinociceptive effect of these antidepressants in physical tests (hot-plate and tail-flick). However, in chemical tests (acetic acid and formalin), the analgesic effect of the antidepressants used was only antagonized by CGP 20712A. These results suggest that the analgesic effect of desipramine and nortriptyline is mediated by beta-adrenoceptors. The beta-adrenoceptor involved depends on the type of nociceptive stimulusbeta 1 and beta 2 are both implicated when the stimulus is physical, but only beta 1 is involved when the stimulus is chemical.

译文

三环抗抑郁药已被证明可用于治疗各种病因性疼痛。单胺能系统似乎与这种现象有关。在这项研究中,使用物理和化学伤害试验在小鼠中研究了选择性β1-(CGP 20712A)和β2-(ICI 118551)肾上腺素能阻滞剂对地昔帕明和去甲替林的镇痛作用的影响,这些试验暗示了不同水平的感觉-运动在中枢神经系统(CNS)中的整合。进行活动测试以检测“假阳性”或“假阴性”结果。获得的结果表明,CGP 20712A和ICI 118551均能够在物理测试(热板和甩尾)中拮抗这些抗抑郁药的镇痛作用。但是,在化学测试(乙酸和福尔马林)中,所用抗抑郁药的镇痛作用仅被CGP 20712A拮抗。这些结果表明,地昔帕明和去甲替林的镇痛作用是由β-肾上腺素能受体介导的。涉及的β-肾上腺素受体取决于伤害性刺激的类型。当刺激是物理刺激时,beta 1和beta 2都牵涉其中,但是当刺激是化学刺激时,仅涉及beta1。

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