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   Diazepam-induced increases of synaptic efficacy in the hippocampal - medial prefrontal cortex pathway are associated with its anxiolytic-like effect in rats  
   
نویسنده shikanai h. ,izumi t. ,matsumoto m. ,togashi h. ,yamaguchi t. ,yoshida t. ,yoshioka m.
منبع journal of pharmacological sciences - 2010 - دوره : 114 - شماره : 3 - صفحه:341 -346
چکیده    The medial prefrontal cortex (mpfc) has recently been shown to be an important brain region for emotional function as well as cognitive ability. in previous experiments,we studied the population spike amplitude (psa) in the mpfc induced by stimulation of the ca1/subicular region as an index of synaptic efficacy in the hippocampal-mpfc pathway. in the present study,we investigated the relationship between the anxiolytic effect of diazepam and the changes of synaptic efficacy in this pathway. in contextual fear conditioning tests,diazepam (0.1 mg/kg) was not effective for fear-related freezing behavior. at a dose of 0.5 mg/kg,diazepam decreased freezing behavior 20 min after administration,with no discernible effect 30 min after administration. in electrophysiological experiments,0.1 mg/kg diazepam had no effect on the psa in the mpfc. in contrast,0.5 mg/kg diazepam increased the psa in the mpfc within 30 min of administration; however,this psa increase was attenuated over the 30-min period. based on these results,we propose that the diazepam-induced psa increase in the mpfc is associated with its anxiolytic-like effect. © 2010 the japanese pharmacological society.
کلیدواژه Anxiety; Behavior; Electrophysiology; Hippocampal - medial prefrontal cortex (mPFC) pathway; Prefrontal cortex
آدرس department of neuropharmacology,hokkaido university graduate school of medicine,kita-15,nishi-7,kita-ku,sapporo 060-8638, Japan, department of neuropharmacology,hokkaido university graduate school of medicine,kita-15,nishi-7,kita-ku,sapporo 060-8638, Japan, department of pharmacology,faculty of pharmaceutical sciences,health sciences university of hokkaido,ishikari-tobetsu 061-0293, Japan, department of pharmacology,faculty of pharmaceutical sciences,health sciences university of hokkaido,ishikari-tobetsu 061-0293, Japan, department of neuropharmacology,hokkaido university graduate school of medicine,kita-15,nishi-7,kita-ku,sapporo 060-8638, Japan, department of neuropharmacology,hokkaido university graduate school of medicine,kita-15,nishi-7,kita-ku,sapporo 060-8638, Japan, department of neuropharmacology,hokkaido university graduate school of medicine,kita-15,nishi-7,kita-ku,sapporo 060-8638, Japan
 
     
   
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