Attenuation of ketamine-evoked behavioral responses by mGluR5 positive modulators in mice

被引:68
作者
Chan, Ming-Huan [1 ,2 ]
Chiu, Pao-Hsiang [1 ]
Sou, Jen-Hou [1 ,3 ]
Chen, Hwei-Hsien [1 ]
机构
[1] Tzu Chi Univ, Inst Pharmacol & Toxicol, Sect 3, Hualien 970, Taiwan
[2] Tzu Chi Univ, Dept Pharmacol, Hualien, Taiwan
[3] Yuli Hosp, Dept Hlth, Hualien, Taiwan
关键词
ketamine; mGluR5; locomotor activity; prepulse inhibition; object recognition;
D O I
10.1007/s00213-008-1103-1
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
Rationale Recent studies have shown that metabotropic glutamate receptor 5 (mGluR5) can modulate N-methyl-D-aspartate receptor function. Our previous findings demonstrated that the selective mGluR5 agonist (RS)-2-chloro-5-hydroxyphenylglycine (CHPG) and the antagonist 2-methyl-6-(phenylethynyl)-pyridine can reduce and enhance the ketamine anesthesia, respectively. Objective The purpose of this study was to examine whether CHPG and positive allosteric modulator 3,3'-difluorobenzaldazine (DFB) can reverse ketamine-induced behavioral responses including locomotor hyperactivity, motor incoordination, sensorimotor gating deficit, and learning impairment. Methods Mice were pretreated with CHPG (5-50 nmol,) or DFB (40-100 nmol) followed by ketamine administration. Locomotor activity, rotarod test, prepulse inhibition (PPI) of acoustic startle test, and novel object recognition test were examined. Results CHPG and DFB had no effect on these behaviors when administered alone. Both of them attenuated the locomotor hyperactivity, motor incoordination, and cognitive impairment induced by ketamine. However, the ketamine-induced PPI deficit was reversed by CHPG (50 nmol) but not by DFB (up to 100 nmol). CHPG and DFB have distinct potency and efficacy in attenuating ketamine-induced behavioral response. Conclusions These behavioral data extend previous findings and further suggest that positive modulation of mGluR5 may provide a novel approach for development of antipsychotic agents.
引用
收藏
页码:141 / 148
页数:8
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