目的：观察产前应激孕鼠子代鼠的抑郁样行为，并探讨产前应激导致子代鼠出现抑郁样行为的作用机制。方法将孕鼠20只随机分观察组和对照组各10只。妊娠第14天（孕鼠进入孕晚期）起对观察组给予束缚应激，45 min／次，3次／d，共束缚7 d。对照组孕鼠孕期不做任何处理，常规饲养。两组子代鼠出生30 d时各取20只（雌雄对半），进行糖水偏爱试验，计算两组雌、雄性子代鼠1％糖水消耗比（1％糖水消耗比表示抑郁性行为严重程度）；随之将试验后子代鼠断头处死，采用液相色谱串联质谱分析法检测两组子代鼠海马组织谷氨酸（ Glu）、γ-氨基丁酸（GABA）和5-羟色胺（5-HT）。结果观察组雌、雄性子代鼠1％糖水消耗比分别为63．13±3．47和59．67±3．33，对照组分别为79．22±7．07和78．67±4．72；观察组雌、雄性子代鼠1％糖水消耗比与对照组相比，P均＜0．05。观察组雌、雄子代鼠海马组织Glu的相对含量分别为（24．30±1．00）、（31．22±1．57） ng／g，对照组分别为（21．20±0．90）、（24．01±0．28）ng／g，观察组雌、雄性子代鼠海马组织Glu的相对含量与对照组相比，P均＜0．05；观察组雌、雄子代鼠海马组织GABA的相对含量分别为（7．42±0．36）、（8．35±0．39）ng／g，对照组分别为（13．28±0．38）、（9．94±0．30）ng／g，观察组雌、雄性子代鼠海马组织GABA的相对含量与对照组相比，P均＜0．05；观察组雌、雄子代鼠海马组织5-HT的相对含量分别为（0．27±0．02）、（0．26±0．01） ng／g，对照组分别为（0．35±0．03）、（0．29±0．02）ng／g，观察组雌性子代大鼠海马组织5-HT的相对含量与对照组相比，P＜0．05。结论产前应激可导致子代鼠出现抑郁样行为，其机制可能与产前应激升高子代鼠海马组织Glu含量及降低GABA、5-HT的水平有关。%Objective To observe the depression-like behavior of the offspring rats from pregnant rats with prenatal stress ( PS) and to investigate its mechanism.Methods Twenty pregnant rats were randomly divided into the PS group and control ( CON) group, 10 in each.From the 14th d of pregnancy ( in late pregnancy) , rats in the observation group were given restraint stress, 45 min/time, 3 times/d, a total of 7 d.Rats in the control group were conventionally fed with-out any treatment.We took 20 offspring rats ( male and female in half) which were born 30 d from each group to undergo sucrose preference test ( SPT) , and calculated the percentage of 1%sugar water consumption in male and female offspring rats of the two groups.Meanwhile, the concentrations of glutamate (Glu),γ-aminobutyric acid (GABA) and serotonin (5-HT) in hippocampus of the rats were measured by Liquid Chromatography-Tandem Mass Spectrometry ( LC-MS/MS) .Re-sults The percentages of 1%sugar water consumption in male and female offspring rats of the PS groups was 63.13 ± 3.47 and 59.67 ±3.33, respectively, and 79.22 ±7.07 and 78.67 ±4.72 in the control group (P<0.05).Further-more, the concentration of Glu was (24.30 ±1.00) ng/g in the female PS group which was more than that 〔(21.20 ± 0.90) ng/g〕 in the female CON group (P<0.05).Similarly, the concentration of Glu in male PS group was (31.22 ± 1.57)ng/g, which was more than that〔(24.01 ±0.28)ng/g〕 in the male CON group (P<0.05).Contrarily, the con-centration of GABA in female PS group was (7.42 ±0.36) ng/g, which was significantly lower than that〔(13.28 ±0.38) ng/g〕 in the female CON group (P<0.05).The concentration of GABA in male PS group was (8.35 ±0.39) ng/g, which was significantly lower than that〔(9.94 ±0.30) ng/g〕 in the female CON group (P<0.05).Only the female PS offspring showed lower 5-HT concentration 〔(0.27 ±0.02) ng/g〕 as compared with that of the CON group 〔(0.35 ± 0.03)ng/g〕(P<0.05).Conclusion Prenatal stress can result in the depression-like behavior of offspring rats, and its mechanism may be related to that prenatal stress increases the Glu content of hippocampal tissue and decreases the levels of GABA, 5-HT of offspring rats.
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