强迫游泳后大鼠杏仁体中谷氨酸神经元中的pCREB水平显著上调(英文)

pCREB IN GLUTAMATE CONTAINING NEURONS GREATLY UPREGULATED IN RAT AMYGDALA AFTER A STRESS BY FORCED SWIMMING

杏仁体在情绪性学习记忆及情绪行为中起关键性作用,而这些功能是由杏仁体的三个主要亚核(外侧核、基底外侧核和中央核)执行完成,并与一种转录因子-环磷酸腺苷反应元件结合蛋白(CREB)密切相关。CREB在多种神经活动中都会被激活成为磷酸化的CREB(pCREB)。为探讨杏仁体中哪种神经元表达pCREB以及在情绪性应激刺激后不同时间段内杏仁体中pCREB水平的变化,本试验对大鼠用强迫游泳作为情绪性应激刺激;以抗pCREB、抗谷氨酸(Glu)和抗小清蛋白(PV)抗体标记了杏仁体中的神经元;用Westernblot法测定了杏仁体中的pCREB蛋白水平。结果显示,pCREB表达于谷氨酸免疫阳性神经元中,而不在含小清蛋白的神经元中表达;而pCREB的表达水平在强迫游泳后显著提升。本结果提示,pCREB是通过谷氨酸神经元行使其对情绪过程的调解功能;情绪性刺激后pCREB的表达水平显著提升以应对应激性刺激。

Amygdala （AM） plays crucial roles in emotional learning, memory and behavior. These functions of AM are carried out by three main subnuclei （lateral nucleus, basolateral nucleus and central nucleus） in AM and closely related with a transcription factor, cAMP- responsive element binding protein （CREB） in the neurons of the AM. CREB can be phosphorylated （pCREB） in many kinds of neuronal processes to regulate the synthesis of proteins for the formation of memory processes. In order to identify what neuronal types express pCREB and how the pCREB levels changed at different time intervals after an emotional stress stimulation, the present study is designed to investigate pCREB-, glutamate （Glu） - and parvalbumin （ PV ）- immunoreactive （IR） profiles in AM and the levels of pCREB in AM after a stress of forced swimming （FS）. The results showed that the pCREB expressed in the GIu-IR neurons but not in the PV-IR neurons, and the expression level of the pCREB increased dramatically after the stress. The present results suggested that pCREB modulates the emotional processes through the Glu-IR neurons and that the pCREB greatly upregulated to response to the emotional stimuli.