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CHANGES IN RAT BRAIN MUSCARINIC RECEPTORS AFTER INHIBITORY AVOIDANCE LEARNING

机译:禁忌性学习后大鼠脑肌肉受体的变化

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It is widely accepted that cerebral acetylcholine is necessary for learning and memory, but little is known about the type of muscarinic receptors involved in these functions. To investigate this problem, [H-3]-N-methyl-scopolamine which binds to different types of muscarinic receptors, [H-3]-Pirenzepine an M(1) receptor antagonist, and [H-3]-Oxotremorine-M which binds mainly to M(2) receptors, were used as ligands to look for possible changes in muscarinic receptor density in neostriatum (NEO), hippocampus (HIP), amygdala (AMY), and temporo-parietal neocortex (CTX), after tec:ting for retention of inhibitory avoidance, trained with high or low footshock intensities. After low reinforcement there was an M(1) postsynaptic receptor up-regulation in NEO, HIP, and CTX, and an M(2) presynaptic receptor down-regulation in HIP, which suggests a concerted pre- and postsynaptic cholinergic activation in this area. An up-regulation of both M(1) and M(2) receptors was detected in CTX of low and footshocked animals, which indicates the presence of a cortical postsynaptic M(2) receptor. [References: 39]
机译:人们普遍认为脑乙酰胆碱是学习和记忆所必需的,但对于涉及这些功能的毒蕈碱受体的类型知之甚少。要研究此问题,[H-3] -N-甲基-东amine碱与不同类型的毒蕈碱受体,[H-3]-哌仑西平(一种M(1)受体拮抗剂)和[H-3] -Oxotremorine-M结合它主要结合M(2)受体,用作配体,以寻找新纹状体(NEO),海马(HIP),杏仁核(AMY)和颞顶新皮层(CTX)的毒蕈碱受体密度的可能变化:ting以保持抑制性避免,用高或低的足部震动强度训练。低强度增强后,NEO,HIP和CTX中的M(1)突触后受体上调,而HIP中的M(2)突触前受体下调,这表明该区域内突触前和突触后胆碱能激活一致。在低位和足部震颤动物的CTX中检测到M(1)和M(2)受体的上调,这表明存在皮层突触后M(2)受体。 [参考:39]

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