目的:痛情绪是疼痛体验的一个重要部分。条件性位置回避(conditioned place avoidance,CPA)装置可用来测量痛情绪,本研究通过操纵影响CPA形成的变量来探究哪些因素会影响痛情绪的形成。方法:采用高渗盐水足底注射建立大鼠条件位置回避(C...目的:痛情绪是疼痛体验的一个重要部分。条件性位置回避(conditioned place avoidance,CPA)装置可用来测量痛情绪,本研究通过操纵影响CPA形成的变量来探究哪些因素会影响痛情绪的形成。方法:采用高渗盐水足底注射建立大鼠条件位置回避(CPA)模型。结果:足底高渗盐水注射引起大鼠自发痛反应,5 min达高峰,15 min基本消失。条件室内两次(0 min、15 min)足底注射高渗盐水配对特定环境训练30 min,大鼠能够形成条件位置回避,单次注射或室外注射高渗盐水均不能形成条件位置回避。结论:影响痛情绪形成的因素有时间因素、线索认知以及匹配时疼痛时相,这三种因素分别指向关于痛情绪形成的两种机制:记忆机制和学习机制。展开更多
目的:观察不同频率电针刺激对大鼠痛情绪的作用。方法:本研究以不同频率电针刺激对痛情绪的作用为研究对象。给大鼠左侧后脚掌注射完全弗氏佐剂(CFA),诱导其产生炎性痛并与环境相匹配,建立条件性位置回避(conditioned place avoidance,C...目的:观察不同频率电针刺激对大鼠痛情绪的作用。方法:本研究以不同频率电针刺激对痛情绪的作用为研究对象。给大鼠左侧后脚掌注射完全弗氏佐剂(CFA),诱导其产生炎性痛并与环境相匹配,建立条件性位置回避(conditioned place avoidance,CPA)模型,给予大鼠环跳穴(GB30)电针刺激(电流3 mA,波宽0.1 ms,刺激频率2、10、100 Hz),通过条件位置回避装置观察在电针刺激前后痛情绪行为变化。结果:2、10、100 Hz电针刺激均明显反转了大鼠的C-CPA反应,但各刺激频率比较差异均无统计学意义(P>0.05)。结论:不同频率的电针刺激均可缓解痛情绪,且无频率依赖性。展开更多
Animals and humans share similar mechanisms of pain detection and similar brain areas involved in pain processing.Also,they show similar pain behaviors,such as reflexed sensation to nociceptive stimuli.Pain is often d...Animals and humans share similar mechanisms of pain detection and similar brain areas involved in pain processing.Also,they show similar pain behaviors,such as reflexed sensation to nociceptive stimuli.Pain is often described in sensory discrimination （algosity） and affective motivation （unpleasantness） dimensions.Both basic and clinical findings indicate that individuals with chronic pain usually suffer more from pain-associated affective disturbances than from the actual pain sensations per se.Although the neural systems responsible for the sensory component of pain have been studied extensively,the neural mechanisms underlying negative affective component are not well understood.This is partly due to the relative paucity of animal paradigms for reliable examination of each component of pain.In humans,the experience of pain and suffering can be reported by language,while in animals,pain can only be inferred through physical and behavioral reactions.Animal behaviors,cognitive psychology and functional brain imaging have made it possible to assess pain affection and pain memory in animals.Animals subjected to either neuropathic injury or inflammatory insult display significant conditioned place aversion to a pain-paired environment in behaviors.The present review aims to summarize the common methods of affective unpleasantness assessment in rats.展开更多
基金supported by the grant from the National Natural Science Foundation of China(No. 30870830)
文摘Animals and humans share similar mechanisms of pain detection and similar brain areas involved in pain processing.Also,they show similar pain behaviors,such as reflexed sensation to nociceptive stimuli.Pain is often described in sensory discrimination （algosity） and affective motivation （unpleasantness） dimensions.Both basic and clinical findings indicate that individuals with chronic pain usually suffer more from pain-associated affective disturbances than from the actual pain sensations per se.Although the neural systems responsible for the sensory component of pain have been studied extensively,the neural mechanisms underlying negative affective component are not well understood.This is partly due to the relative paucity of animal paradigms for reliable examination of each component of pain.In humans,the experience of pain and suffering can be reported by language,while in animals,pain can only be inferred through physical and behavioral reactions.Animal behaviors,cognitive psychology and functional brain imaging have made it possible to assess pain affection and pain memory in animals.Animals subjected to either neuropathic injury or inflammatory insult display significant conditioned place aversion to a pain-paired environment in behaviors.The present review aims to summarize the common methods of affective unpleasantness assessment in rats.
