首页> 外文期刊>Behavioural Brain Research: An International Journal >Early exposure to chronic variable stress facilitates the occurrence of anhedonia and enhanced emotional reactions to novel stressors: reversal by naltrexone pretreatment.
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Early exposure to chronic variable stress facilitates the occurrence of anhedonia and enhanced emotional reactions to novel stressors: reversal by naltrexone pretreatment.

机译:尽早暴露于慢性可变应激会促进快感缺乏症的发生,并增强对新型应激源的情绪反应:纳曲酮预处理可逆转这种应激。

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摘要

The present research studied the influence of an early chronic variable stress (CVS) paradigm - an animal model of depression - on behavioral responses to subsequent environmental challenges suggested to model anhedonia and emotional reactions such as anxiety and fear. In order to explore a potential involvement of an endogenous opiate mechanism - presumably activated during CVS exposure - in the development of such behavioral reactions, in all experiments rats were administered naltrexone (NAL, 2 mg/kg, i.p.) or vehicle (VH) prior to each daily stressor of the CVS procedure. Animals were exposed to CVS and 1 week later tested for sucrose preference (1%) in a free choice paradigm after the presentation or not of a 90-min restraint period. Only CVS treated animals that were later exposed to restraint showed a reduction of sucrose preference, this reduction was absent when CVS rats were pretreated previously with NAL. Moreover, CVS rats were one week later tested on the elevated plus maze (EPM) and in their conditioned and unconditioned freezing response to a single shock session. Early chronic stress resulted in an anxiogenic behavior in the EPM and in an enhanced conditioned and unconditioned freezing which were all abolished by NAL pretreatment. These behavioral findings suggest that the potential activation of an endogenous opiate mechanism during CVS participates in the development of anhedonia and exaggerated emotional reactions in response to subsequent stressful experiences.
机译:本研究研究了早期的慢性可变压力(CVS)范例-抑郁症的动物模型-对随后环境挑战的行为反应的影响,这些环境挑战被认为是对快感缺乏症和情绪反应(如焦虑和恐惧)建模的模型。为了探讨这种行为反应发展过程中内源性阿片剂机制(可能在CVS暴露过程中被激活)的潜在参与,在所有实验中,大鼠均先给予纳曲酮(NAL,2 mg / kg,ip)或赋形剂(VH)对CVS程序的每个日常压力。使动物暴露于CVS,并在出现或不存在90分钟的束缚期后,在自由选择范式下1周后测试其蔗糖偏好(1%)。仅CVS处理的动物后来暴露于约束下,显示出蔗糖偏爱的降低,当CVS大鼠预先用NAL预处理时,这种降低是不存在的。此外,一周后,对CVS大鼠在高架迷宫(EPM)上进行了测试,并对单次电击进行了条件性和非条件性冷冻反应测试。早期的慢性应激导致EPM中的焦虑发生,并导致条件性和非条件性冰冻增强,这些都被NAL预处理所消除。这些行为发现表明,在CVS期间内源性阿片类药物机制的潜在激活参与了快感不足和对随后的压力经历的夸大情绪反应。

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