Pain consists of sensory-discriminative and emotional-affective components.The anterior cingulate cortex(ACC)is a critical brain area in mediating the affective pain.However,the molecular mechanisms involved remain la...Pain consists of sensory-discriminative and emotional-affective components.The anterior cingulate cortex(ACC)is a critical brain area in mediating the affective pain.However,the molecular mechanisms involved remain largely unknown.Our recent study indicated that C-X-C motif chemokine 13(CXCL13)and its sole receptor CXCR5 are involved in sensory sensitization in the spinal cord after spinal nerve ligation(SNL).Whether CXCL13/CXCR5 signaling in the ACC contributes to the pathogenesis of pain-related aversion remains unknown.Here,we showed that SNL increased the CXCL13 level and CXCR5 expression in the ACC after SNL.Knockdown of CXCR5 by microinjection of Cxcr5 shRNA into the ACC did not affect SNL-induced mechanical allodynia but effectively alleviated neuropathic painrelated place avoidance behavior.Furthermore,electrophysiological recording from layer Ⅱ-Ⅲ neurons in the ACC showed that SNL increased the frequency and amplitude of spontaneous excitatory postsynaptic currents(sEPSCs),decreased the EPSC paired-pulse ratio,and increased the α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor/N-methyl-D-aspartate receptor ratio,indicating enhanced glutamatergic synaptic transmission.Finally,superfusion of CXCL13 onto ACC slices increased the frequency and amplitude of spontaneous EPSCs.Pre-injection of Cxcr5 shRNA into the ACC reduced the increase in glutamatergic synaptic transmis sion induced by SNL.Collectively,these results suggest that CXCL13/CXCR5 signaling in the ACC is involved in neuropathic pain-related aversion via synaptic potentiation.展开更多
吗啡是一种有效的镇痛药,但易使动物产生耐受性和成瘾性。在该实验中,中缅树鼩(Tupai a belangeri chinensis)连续7d,每天接受三次肌肉注射递增剂量(5、10、15、20mg/kg体重)吗啡后对吗啡产生耐受和依赖;吗啡注射完成后,腹腔注射纳洛酮(...吗啡是一种有效的镇痛药,但易使动物产生耐受性和成瘾性。在该实验中,中缅树鼩(Tupai a belangeri chinensis)连续7d,每天接受三次肌肉注射递增剂量(5、10、15、20mg/kg体重)吗啡后对吗啡产生耐受和依赖;吗啡注射完成后,腹腔注射纳洛酮(1.25mg/kg体重)催瘾,可诱导其条件性位置厌恶(conditioned place aversion,CPA)及相应吗啡戒断症状的出现。该结果提示树鼩慢性吗啡依赖模型的建立可用于研究吗啡依赖和耐受的生物学机制,以及减轻戒断症状药物的筛选。展开更多
目的:探讨慢性吗啡依赖大鼠纳洛酮催瘾戒断后条件性位置厌恶(conditioned place aversion,CPA)建立、消退和重建过程中,伏隔核壳区(shell of accumbens nucleus,AcbSH)内cAMP反应元件结合蛋白(cyclic-3’,5’adenosine monophosphate re...目的:探讨慢性吗啡依赖大鼠纳洛酮催瘾戒断后条件性位置厌恶(conditioned place aversion,CPA)建立、消退和重建过程中,伏隔核壳区(shell of accumbens nucleus,AcbSH)内cAMP反应元件结合蛋白(cyclic-3’,5’adenosine monophosphate response element binding protein,CREB)蛋白表达的适应性变化。方法:(1)连续6 d半每天2次吗啡腹腔注射(10 mg.kg-1.次-1),纳洛酮一次腹腔注射催瘾(0.3 mg.kg-1)搭配训练箱建立CPA,相继对其进行连续7 d(12次,15 min.次-1)消退,然后再经吗啡点燃和纳洛酮催瘾注射搭配训练箱重建CPA。(2)采用免疫组化的方法,于CPA建立后、消退后和重建后不同时间点,检测大鼠AcbSH内CREB的表达情况。结果:(1)慢性吗啡腹腔注射纳洛酮一次腹腔注射催瘾搭配训练箱成功建立CPA大鼠模型,且可被消退和重建。(2)CPA建立后,AcbSH内磷酸化CREB(p-CREB,Ser-133)较对照组表达显著增强(P<0.05);CPA经消退后,p-CREB表达亦相应地显著降低(P<0.01);CPA重建后,p-CREB显著性高表达(P<0.01)。结论:(1)AcbSH可能是慢性吗啡注射纳洛酮催瘾后CPA的重要解剖基础;(2)提示AcbSH内CREB介导的可塑性变化是中枢的情绪状态和强化效应重要的分子机制。展开更多
目的:研究杏仁中央核(Central nucleus of the amygdala,CeA)N-甲基-D-天冬氨酸(N-methyl-D-aspartate,NMDA)受体在纳络酮诱发急性吗啡依赖大鼠戒断性情绪反应中的作用。方法:吗啡、纳络酮间隔4小时皮下注射,通过两轮纳络酮匹配训练建...目的:研究杏仁中央核(Central nucleus of the amygdala,CeA)N-甲基-D-天冬氨酸(N-methyl-D-aspartate,NMDA)受体在纳络酮诱发急性吗啡依赖大鼠戒断性情绪反应中的作用。方法:吗啡、纳络酮间隔4小时皮下注射,通过两轮纳络酮匹配训练建立条件性位置厌恶(Conditioned place aversion,CPA),作为急性吗啡依赖戒断诱发的情绪反应模型。观察纳络酮匹配训练前CeA微量注射NMDA受体拮抗剂地卓西平(MK801)对大鼠训练后在纳络酮匹配侧停留时间的影响。结果:戒断组大鼠经过两轮训练后在纳络酮匹配侧停留时间(230.4±32.8s)比假手术组(457.6±47.8s)显著缩短(P<0.01),训练前CeA微量注射MK801大鼠在纳络酮匹配侧停留时间(447.0±51.8s)比戒断组(230.4±32.8s)显著延长(P<0.01),非戒断组大鼠(急性吗啡依赖组,未接触吗啡组)训练前CeA注射MK801训练前后在处理侧停留时间差异无显著性(P>0.05)。结论:CeA注射MK801既无奖赏效应也无厌恶效应,但能阻断CPA的建立,提示CeA的NMDA受体参与急性吗啡依赖戒断诱发的情绪反应。展开更多
基金supported by grants from the National Natural Science Foundation of China (31671091 and 81771197)the Natural Science Foundation of Jiangsu Province, China (BK20171255)the Science and Technology Planning Project of Nantong Municipality, China (MS12017023-9)
文摘Pain consists of sensory-discriminative and emotional-affective components.The anterior cingulate cortex(ACC)is a critical brain area in mediating the affective pain.However,the molecular mechanisms involved remain largely unknown.Our recent study indicated that C-X-C motif chemokine 13(CXCL13)and its sole receptor CXCR5 are involved in sensory sensitization in the spinal cord after spinal nerve ligation(SNL).Whether CXCL13/CXCR5 signaling in the ACC contributes to the pathogenesis of pain-related aversion remains unknown.Here,we showed that SNL increased the CXCL13 level and CXCR5 expression in the ACC after SNL.Knockdown of CXCR5 by microinjection of Cxcr5 shRNA into the ACC did not affect SNL-induced mechanical allodynia but effectively alleviated neuropathic painrelated place avoidance behavior.Furthermore,electrophysiological recording from layer Ⅱ-Ⅲ neurons in the ACC showed that SNL increased the frequency and amplitude of spontaneous excitatory postsynaptic currents(sEPSCs),decreased the EPSC paired-pulse ratio,and increased the α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor/N-methyl-D-aspartate receptor ratio,indicating enhanced glutamatergic synaptic transmission.Finally,superfusion of CXCL13 onto ACC slices increased the frequency and amplitude of spontaneous EPSCs.Pre-injection of Cxcr5 shRNA into the ACC reduced the increase in glutamatergic synaptic transmis sion induced by SNL.Collectively,these results suggest that CXCL13/CXCR5 signaling in the ACC is involved in neuropathic pain-related aversion via synaptic potentiation.
文摘吗啡是一种有效的镇痛药,但易使动物产生耐受性和成瘾性。在该实验中,中缅树鼩(Tupai a belangeri chinensis)连续7d,每天接受三次肌肉注射递增剂量(5、10、15、20mg/kg体重)吗啡后对吗啡产生耐受和依赖;吗啡注射完成后,腹腔注射纳洛酮(1.25mg/kg体重)催瘾,可诱导其条件性位置厌恶(conditioned place aversion,CPA)及相应吗啡戒断症状的出现。该结果提示树鼩慢性吗啡依赖模型的建立可用于研究吗啡依赖和耐受的生物学机制,以及减轻戒断症状药物的筛选。
文摘目的:研究杏仁中央核(Central nucleus of the amygdala,CeA)N-甲基-D-天冬氨酸(N-methyl-D-aspartate,NMDA)受体在纳络酮诱发急性吗啡依赖大鼠戒断性情绪反应中的作用。方法:吗啡、纳络酮间隔4小时皮下注射,通过两轮纳络酮匹配训练建立条件性位置厌恶(Conditioned place aversion,CPA),作为急性吗啡依赖戒断诱发的情绪反应模型。观察纳络酮匹配训练前CeA微量注射NMDA受体拮抗剂地卓西平(MK801)对大鼠训练后在纳络酮匹配侧停留时间的影响。结果:戒断组大鼠经过两轮训练后在纳络酮匹配侧停留时间(230.4±32.8s)比假手术组(457.6±47.8s)显著缩短(P<0.01),训练前CeA微量注射MK801大鼠在纳络酮匹配侧停留时间(447.0±51.8s)比戒断组(230.4±32.8s)显著延长(P<0.01),非戒断组大鼠(急性吗啡依赖组,未接触吗啡组)训练前CeA注射MK801训练前后在处理侧停留时间差异无显著性(P>0.05)。结论:CeA注射MK801既无奖赏效应也无厌恶效应,但能阻断CPA的建立,提示CeA的NMDA受体参与急性吗啡依赖戒断诱发的情绪反应。
