Inhibitory Effects of Ginseng Total Saponins on Behavioral Sensitization and Dopamine Release Induced by Cocaine(Pharmacology)
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概要
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Many studies have suggested that the behavioral and reinforcing effects of cocaine can be mediated by the central dopaminergic systems. It has been shown that repeated injections of cocaine produce an increase in locomotor activity, the expression of the immediate-early gene, c-fos, and the release of dopamine (DA) in the nucleus accumbens (NAc), which is one of the main dopaminergic terminal areas. Several studies have shown that behavioral activation and changes in extracellular dopamine levels in the central nervous system induced by psychomotor stimulants are prevented by ginseng total saponins (GTS). In order to investigate the effects of GTS on the repeated cocaine-induced behavioral and neurochemical alterations, we examined the influence of GTS on the cocaine-induced behavioral sensitization and on c-Fos expression in the brain using immunohistochemistry in rats repeatedly treated with cocaine. We also examined the effect of GTS on cocaine-induced dopamine release in the NAc of freely moving rats repeatedly treated with cocaine using an in vivo microdialysis technique. Pretreatment with GTS (100, 200, 400 mg/kg, i.p.) 30 min before the daily injections of cocaine (15 mg/kg, i.p.) significantly inhibited the repeated cocaine-induced increase in locomotor activity as well as the c-Fos expression in the core and shell in a dose-dependent manner. Also, pretreatment with GTS significantly decreased the repeated cocaine-induced increase in dopamine release in the NAc. Our data demonstrate that the inhibitory effects of GTS on the repeated cocaine-induced behavioral sensitization were closely associated with the reduction of dopamine release and the postsynaptic neuronal activity. The results of the present study suggest that GTS may be effective for inhibiting the behavioral effects of cocaine by possibly modulating the central dopaminergic system. These results also suggest that GTS may prove to be a useful therapeutic agent for cocaine addiction.
- 2008-03-01
著者
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YANG Chae
Department of Physiology, Daegu Haany University
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LEE Hye-Jung
Acupuncture & Meridian Science Research Center, Institute of Oriental Medicine, Kyunghee University
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HAHM Dae-Hyun
Acupuncture & Meridian Science Research Center, Institute of Oriental Medicine, Kyunghee University
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Lee Han-chang
Department Of Meridian And Acupuncture College Of Oriental Medicine Kyung Hee University
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Kim Kyung-soo
Departmentof Integrative Medicine College Of Medicine The Catholic University Of Korea
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Lee Hye-jung
Acupuncture & Meridian Science Research Center Kyung-hee University:institute Of Oriental Medici
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Hahm Dae-hyun
Acupuncture And Meridian Science Research Center Kyung Hee University
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Hahm Dae-hyun
Acupuncture & Meridian Science Research Center Kyung-hee University:institute Of Oriental Medici
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Lee H‐j
Department Of Meridian And Acupuncture College Of Oriental Medicine Kyung Hee University
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SHIM Insop
Department of Integrative Medicine, College of Medicine, The Catholic University of Korea
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Yang Chae
Department Of Physiology College Of Oriental Medicine Daegu Haany University
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Han Seung-moo
Department Of Biomedical Engineering Kyung Hee University
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Shim Insop
Department Of Integrative Medicine College Of Medicine The Catholic University Of Korea
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Shim Insop
Department Of Oriental Medical Science Graduate School Of East-west Medical Science
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LEE BomBi
Department of Neurobiology, Division of Neuroscience, Children's Hospital and Harvard Medical School
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Hahm Dae-hyun
Institute Of Oriental Medicine College Of Korean Medicine Kyung Hee University
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Lee H.-j.
Acupuncture And Meridian Science Research Center (amsrc) Kyung Hee University
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Yang Chae
Department Of Oriental Medicine College Of Oriental Medicine
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Lee Bombi
Department of Neurobiology, Division of Neuroscience, Children's Hospital and Harvard Medical School
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