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Morphine withdrawal affects both delayed-escape behaviour in Morris water maze and hippocampal NR2A/2B expression ratio
Dong, Zhifang1,2; Zhong, Weixia3; Tian, Meng1,2; Han, Huili1,2; Mao, Rongrong1,2; Cao, Jun1,2; Sui, Nan4; Xu, Tianle5; Luo, Jianhong3; Xu, Lin1,2,6; Lin Xua
2008-05-01
Source PublicationBRAIN RESEARCH
ISSN0006-8993
SubtypeArticle
Volume1207Pages:164-173
AbstractRepeated low-dose morphine treatment facilitates delayed-escape behaviour of hippocampus-dependent Morris water maze and morphine withdrawal influences hippocampal NMDA receptor-dependent synaptic plasticity. Here, we examined whether and how morphine withdrawal influenced delayed-escape behaviour and NR2A/2B expression ratio of hippocampal synaptosomes. We found that both delayed-escape behaviour and NR2A/2B expression ratio showed an inverted-U curve and peaked on 4-day withdrawal during a 20-day withdrawal period. Furthermore, treatment of the glucocorticoid receptor antagonist RU38486 for 3 days reduced delayed-escape behaviour and NR2A/2B ratio on 4-day withdrawal to a level similar to those of 18-h withdrawal. In contrast, elevated-platform stress enabled delayed-escape behaviour of 18-h withdrawal to a higher level similar to that of 4-day withdrawal, but had no significant effect on the NR2A/2B ratio. Similar behavioural effects were also found after intrahippocampal infusions of the NMDAR antagonist AP-5 or NR2B-containing NMDAR antagonist Ro25-6981 for 3 days. These findings suggest that delayed-escape behaviour enabled by repeated low-dose morphine treatment may be a useful and simple rat model for studying addictive memories to be retrieved by stress exposure.; Repeated low-dose morphine treatment facilitates delayed-escape behaviour of hippocampus-dependent Morris water maze and morphine withdrawal influences hippocampal NMDA receptor-dependent synaptic plasticity. Here, we examined whether and how morphine withdrawal influenced delayed-escape behaviour and NR2A/2B expression ratio of hippocampal synaptosomes. We found that both delayed-escape behaviour and NR2A/2B expression ratio showed an inverted-U curve and peaked on 4-day withdrawal during a 20-day withdrawal period. Furthermore, treatment of the glucocorticoid receptor antagonist RU38486 for 3 days reduced delayed-escape behaviour and NR2A/2B ratio on 4-day withdrawal to a level similar to those of 18-h withdrawal. In contrast, elevated-platform stress enabled delayed-escape behaviour of 18-h withdrawal to a higher level similar to that of 4-day withdrawal, but had no significant effect on the NR2A/2B ratio. Similar behavioural effects were also found after intrahippocampal infusions of the NMDAR antagonist AP-5 or NR2B-containing NMDAR antagonist Ro25-6981 for 3 days. These findings suggest that delayed-escape behaviour enabled by repeated low-dose morphine treatment may be a useful and simple rat model for studying addictive memories to be retrieved by stress exposure. (C) 2008 Elsevier B.V. All rights reserved.
Keywordopiate withdrawal stress delayed-escape behaviour long-term potentiation NR2A NR2B hippocampus
Subject Area生理心理学/生物心理学
Indexed BySCI
Language英语
WOS IDWOS:000255729200017
Citation statistics
Document Type期刊论文
Identifierhttp://ir.psych.ac.cn/handle/311026/5557
Collection中国科学院心理研究所回溯数据库(1956-2010)
Corresponding AuthorLin Xua
Affiliation1.Chinese Acad Sci, Kunming Inst Zool, Key Lab Anim Models & Human Dis Mech, Kunming 650223, Yunnan, Peoples R China
2.Chinese Acad Sci, Kunming Inst Zool, Lab Learning & Memory, Kunming 650223, Peoples R China
3.Zhejiang Univ, Sch Med, Dept Neurobiol, Hangzhou 310006, Peoples R China
4.Chinese Acad Sci, Inst Psychol, Key Lab Mental Hlth, Beijing 100101, Peoples R China
5.Chinese Acad Sci, Shanghai Inst Biol Sci, Inst Neurosci, Shanghai 200031, Peoples R China
6.Cent S Univ, Xiangya Hosp 2, Mental Hlth Inst, Changsha 410011, Peoples R China
Recommended Citation
GB/T 7714
Dong, Zhifang,Zhong, Weixia,Tian, Meng,et al. Morphine withdrawal affects both delayed-escape behaviour in Morris water maze and hippocampal NR2A/2B expression ratio[J]. BRAIN RESEARCH,2008,1207:164-173.
APA Dong, Zhifang.,Zhong, Weixia.,Tian, Meng.,Han, Huili.,Mao, Rongrong.,...&Lin Xua.(2008).Morphine withdrawal affects both delayed-escape behaviour in Morris water maze and hippocampal NR2A/2B expression ratio.BRAIN RESEARCH,1207,164-173.
MLA Dong, Zhifang,et al."Morphine withdrawal affects both delayed-escape behaviour in Morris water maze and hippocampal NR2A/2B expression ratio".BRAIN RESEARCH 1207(2008):164-173.
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