EFFECT OF CHOLECYSTOKININ-8 MICROINJECTION INTO VENTRAL TEGMENTAL AREA ON DOPAMINE RELEASE IN NUCLEUS ACCUMBENS OF RATS： AN IN VIVO VOLTAMMETRIC STUDY

Effects of microinjection of cholecystokinin-8 (CCK-8) into the rat ventral tegmental area were studied on dopamine (DA) release from nucleus accumbens (Acb), using fast cyclic vohammetry and carbon fibre microelectrode. DA release was evoked by electrical stimulation of the medial forebrain bundle (MFB). DA release from Acb was increased with increasing intensity or frequency of electrical stimulation in a dose-dependent manner and was inhibited by microinjection of CCK-8 (0.5μg/kg) into the ventral tegmental area.

脾气虚大鼠焦虑样行为及其初步机制研究

目的研究脾气虚大鼠焦虑程度的变化并探讨其可能机制。方法选取雄性SD大鼠16只,体质量(200±10)g,将其随机分为对照组和脾气虚组(模型组),每组8只。旷场实验评价大鼠焦虑程度;ELISA法测定海马组织ATP和缩胆囊素-8(CCK-8)含量;免疫组化法检测海马CCKB型受体(CCKBR)表达。结果与对照组比较,模型组的焦虑程度显著降低(P<0.01),海马组织的ATP含量降低(P<0.05),海马CCK-8水平变化不明显(P>0.05),但其受体表达下降(P<0.05)。结论脾气虚时焦虑程度下降,其初步机制与海马能量不足和CCKBR表达减少有关。