冲突性应激致大鼠行为和内分泌的变化

目的研究在冲突性应激条件下大鼠行为和内分泌的变化.方法 56只成年雄性SD大鼠,随机分为8组,每组7只,利用Vogel冲突实验方法稍加修改,作为应激源,开场试验检测行为反应,测量体重,利用酶联免疫方法检测血清中皮质酮的含量.结果与对照组相比,1周、2周、4周应激组大鼠表现为体重明显降低(216.5±8.71g,194.94±14.82g,259.75±13.83g):;在运动性方面,1、2、4周应激组大鼠(67.1±9.2,53.66±6.86,59.25±6.46)有增加的趋势或者明显增加,在实验过程中,所有应激组大鼠皮质酮不同(1次应激组274.41±25.39ng.ml-1,1周应激组240.44±29.51ng.ml-1,2周应激组254.21±37.16ng.ml-1,4周应激组161.02±46ng.ml-1)较对照组(89.33±14.04ng.ml-1)明显升高.结论在应激大鼠表现的增多的运动,升高的皮质酮以及降低的体重,与焦虑障碍的某些特点相似,并且行为和内分泌的变化可以维持一段时间.冲突相关的应激可以作为研究焦虑及其他精神创伤应激比较理想的动物模型.

Behavioral and endocrine changes following conflict-related stress

Objective To investigate behavioral and endocrinal changes following the conflict-related stress. Method Male SpragueDawley rats were exposed to stressors using Vogel conflict test. Body weight and behavioral responses in open field test were investigated during the whole procedure. Serum corticosterone level was analyzed using immunoassay. Results Compared with the control, the rats of the 1-week, 2-week and 4-week stressed group showed significantly decreased body weight. There was increasing tendency or significant difference in locomotion between the 1 -week, 2-week and 4-week stressed group and their control. And the hormone levels for the stressed animal were reliably high. Conclusions The increased locomotion, and high corticosterone level and reduced body weight in stress animal,was consistent with the features of anxiety-like disorders. Furthermore, the behavioral and endocrine changes produced by conflict-related stress could maintain a long time. The conflictrelated stress paradigm may be used as psychological stress animal mode in the future.