Influences of cholecystokinin and analogues on memory processes

Influences of cholecystokinin and analogues on memory processes
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胆囊收缩素及其类似物对记忆过程的影响

DOI:
10.1002/ddr.430210402
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发表时间:
1990
影响因子:
3.8
通讯作者:
H. Lal
H. Lal
中科院分区:
医学3区
文献类型:
--
作者:
S. Itoh;H. Lal

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证据进行审查分配胆囊收缩素在认知和记忆过程中的作用。大鼠大脑中含有约550 ng CCK-8。当icv或sc注射剂量小于100 ng CCK或雨蛙肽时,这些肽可预防实验性遗忘并延长已学习任务的消退。雨蛙肽的效力几乎是CCK-8的10倍,而且这两种肽的作用都是持久的。用这些肽预处理还防止东莨菪碱诱导的健忘症,并逆转额叶和颞叶皮质以及海马中的ACh消耗。小剂量的CCK-8拮抗剂产生完全的遗忘,进一步支持内源性CCK-8调节大脑记忆过程的假设。神经化学数据表明NMDA受体、蛋白激酶C和蛋白质合成参与CCK-8和雨蛙素的作用。皮下迷走神经切断术消除了这些肽在外周给药时的记忆增强作用。因此,CCK-8和雨蛙素不仅可能影响中枢神经系统中的受体,而且可能刺激与迷走神经相关的外周受体。另外,迷走神经可能是CCK从内脏器官转运到大脑的主要途径。
Evidence is reviewed to assign the role of cholecystokinins in the cognitive and memory processes. Rat brain contains about 550 ng of CCK‐8. When injected, icv or sc, in doses of less than 100 ng of CCK or caerulein, these peptides prevent experimental amnesia and prolong extinction of the already‐learned tasks. Caerulein is nearly 10 times as potent as CCK‐8, and the effects of both peptides are long‐lasting. Pretreatment with these peptides also prevents scopolamine‐induced amnesia, and reverses the ACh depletion in the frontal and temporal cortices as well as in the hippocampus. CCK‐8 antagonists in small doses produce complete amnesia, further supporting the hypothesis that endogenous CCK‐8 modulates the memory processes in the brain. Neurochemical data suggest participation of the NMDA receptors, protein kinase C, and protein synthesis in the action of CCK‐8 and caerulein. Sub‐diaphragmatical vagotomy abolishes the memory‐enhancing effects of these peptides when administered peripherally. Thus, CCK‐8 and caerulein are likely to affect not only the receptors localized in the CNS, but also to stimulate peripheral receptors associated with the vagus. Alternatively, the vagus may be the major pathway for CCK transport from the visceral organs to the brain.
NMDA 受体的拮抗作用会损害嗅觉记忆的获取,但不会损害嗅觉记忆的保留。
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