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CHANGES OF POMC mRNA IN HYPOTHALAMUS OF MORPHINE DEPENDENT
AND ABSTINENT RATS
CUI Yijie1, WANG Xinhua1, YOU Zhengdong2, SHI Yueyin1, LI Jiale1
1(Departmant of Anesthesiology, Changzheng Hospital, Second Military Medical University, Shanghai,200003)
2(Department of Neurobiology, Second Military Medical University, Shanghai, 200003)
ABSTRACT Objective: To observe the contents of POMC mRNA in the central nervous system of morphine dependent and abstinent rats. Method: The animal models of morphine dependence were established by intraperitoneal injecting morphine in rats, three times a day, for 9 days. The dose of morphine was added according to an escalating dose schedule. The rats in control group were injected with saline. The rats with morphine dependence were randomly divided into two groups: morphine dependent group and abstinent group. The rats in dependent group and control group were killed 3 hours after the last injection; the rats in abstinent group were killed 72 hours after the last injection of morphine. Then the pituitary, striatum, hypothalamus and hippocampus were collected and the concentration of POMC mRNA of each region was determined by Northern Blot hybridization. The results were analyzed by a computer assisted photograph analysis system. Result: The level of POMC mRNA of morphine dependent group rats was suppressed to 69.56% of that of the control group. In morphine abstinent group the level of POMC mRNA increased to 78.26% of that of the control group compared with the morphine dependent group, but it was still significantly lower than that of the control group.Conclusion:The level of POMC mRNA of morphine dependent group rats was suppressed significantly. In morphine abstinent group the level of POMC mRNA increased compared with that of the morphine dependent group, but it was still lower than that of the control group. These results show that opioids modify endogenous opioid systems in the central nervous system and provide further support for the hypothesis. Such changes may contribute to the mechanisms of opiate dependence and abstinence.
KEY WORDS morphine dependence; abstinence; POMC mRNA; hypothalamus
修回日期:2000-03-22
中国药物依赖性杂志
2000年 第9卷 第4期
[论著]
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