Abstract
目的 探讨慢性不可预见性应激抑郁模型大鼠大脑皮层亚细胞成分蛋白激酶CβⅡ(PKC βⅡ)的表达水平以及三环类抗抑郁剂(TCAs)阿米替林、5-羟色胺再摄取抑制剂(SSRI)氟西汀对其影响.方法24只Sprague-Dewley雄性大鼠随机分为抑郁模型组6只,阿米替林治疗组6只,氟西汀治疗组6只,正常对照组6只.采用慢性轻度不可预见性应激方法建立抑郁模型,将9种刺激随机安排到18 d,每天1种,应激前以及应激18d末对各组大鼠进行敞箱实验及液体消耗实验,第19天起阿米替林组、氟西汀组分别每天腹腔注射阿米替林(10mg·kg-1·d-1)、氟西汀(10mg·kg-1·d-1)1次,模型组及对照组每天腹腔注射等体积生理盐水1次,均持续21d.用蛋白质免疫印迹法检测大鼠大脑皮层亚细胞成分PKC βⅡ的表达水平.结果抑郁大鼠大脑皮层细胞膜PKCβⅡ蛋白表达水平(230.57±62.86)较对照组(331.26±17.94)明显减少(P＜0.05);抑郁大鼠大脑皮层细胞浆PKCβⅡ蛋白表达水平(286.43±56.92)与对照组(343.55±70.48)比较,有下降趋势,但差异无显著性(P＞0.05).阿米替林、氟西汀治疗3周后抑郁大鼠大脑皮层亚细胞成分PKCβⅡ表达水平无明显变化(P＞0.05).结论大脑皮层细胞膜PKCβⅡ蛋白表达水平明显下降可能是抑郁症发病的重要环节.阿米替林、氟西汀对抑郁大鼠大脑皮层亚细胞成分PKC βⅡ的蛋白表达水平没有影响。
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