Erucamide (Era) is a bioactive fatty acid amide, which is similar to the classical endocannabinoid analogue oleoylethanolamide (OEA). In the present study, we hypothesized that Era may regulate the central nervous system and may have the potential to antagonize depression and anxiety. Therefore, we investigated the antidepressant and anxiolytic effects of Era in animal models in comparison with fluoxetine (Fxt). Fifty mice were randomly divided into 5 groups, and treated with a vehicle (0.3% methyl cellulose, 20mL/kg, p.o.), Era (5, 10, 20mg/kg, p.o.), or Fxt (20mg/kg, p.o.) for 7days. Immobility was used to evaluate depressive-like behavior in the forced swimming test (FST) and tail suspension test (TST). Animal activity and exploratory behavior as well as anxiety-like behaviors were measured in open field test (OFT) and elevated plus-maze test (EPMT) in mice. Additionally, serum adrenocorticotrophic hormone (ACTH) and corticosterone (CORT) levels were determined using the ELISA method, and the total anti-oxidative capacity (T-AOC) was detected by ultraviolet spectrophotometry. Our data showed that Era (5, 10, or 20mg/kg) induced a significant reduction in mouse immobility time in the TST and FST compared to the normal control group (vehicle group). The positive control, Fxt (20mg/kg group), also induced a significant change in immobility time in the TST and FST compared to the control (vehicle) group. In the OFT, compared with the control group, Fxt (20mg/kg) and Era (5, 10, or 20mg/kg) did not significantly change the locomotive activity (locomotive time, immobility time, or locomotive distance) in mice, but Fxt (20mg/kg) and Era (10, or 20mg/kg) significantly increased the percentage of time spent and squares visited in the OFT central area. In regards to the EPMT, the data showed that Fxt (20mg/kg) and Era (10, 20mg/kg) significantly increased the ratio of time spent and entries in open arms, but did not significantly change the total locomotive distance (including open arms and closed arms) compared to the control group. Biochemical tests found that after 7days of drug treatment, compared with the control group, ACTH and CORT serum levels in mice were significantly decreased, although T-AOC levels did not significantly change. In conclusion, Era (dose range of 5-20mg/kg) administered orally may alleviate depression- and anxiety-like behaviors in mice, and the antidepressant and anti-anxiety effects of Era may be related to the regulation of the hypothalamus-pituitary-adrenal axis (HPA).

译文

芥酸酰胺 (Era) 是一种生物活性脂肪酸酰胺,类似于经典的内源性大麻素类似物油酰乙醇酰胺 (OEA)。在本研究中,我们假设Era可能调节中枢神经系统,并且可能具有对抗抑郁和焦虑的潜力。因此,我们与氟西汀 (Fxt) 相比,研究了Era在动物模型中的抗抑郁和抗焦虑作用。将50只小鼠随机分为5组,用赋形剂 (0.3% 甲基纤维素,20ml/kg,p.o.) 、Era (5,10,20 mg/kg,p.o.) 或Fxt (20 mg/kg,p.o.) 处理7天。在强迫游泳测试 (FST) 和尾部悬挂测试 (TST) 中,使用不动来评估类似抑郁的行为。在小鼠的野外试验 (OFT) 和高架迷宫试验 (EPMT) 中测量了动物的活动和探索行为以及焦虑样行为。此外,采用ELISA法测定血清促肾上腺皮质激素 (ACTH) 和皮质酮 (CORT) 水平,并通过紫外分光光度法检测总抗氧化能力 (t-aoc)。我们的数据显示,与正常对照组 (媒介物组) 相比,Era (5、10或20 mg/kg) 在TST和FST中诱导小鼠不动时间显着减少。与对照组 (赋形体) 相比,阳性对照Fxt (20 mg/kg组) 在TST和FST中也引起了不动时间的显着变化。在OFT中,与对照组相比,Fxt (20 mg/kg) 和Era (5、10或20 mg/kg) 并未显着改变小鼠的机车活动 (机车时间,不动时间或机车距离),但Fxt (20 mg/kg) 和Era (10,或20 mg/kg) 显着增加了OFT中心区域花费时间和访问广场的百分比。关于EPMT,数据显示,Fxt (20 mg/kg) 和Era (10,20 mg/kg) 显着增加了张开臂所花费的时间和进入的比率,但并未显着改变总机车距离 (包括张开臂和闭合臂) 与对照组相比。生化测试发现,药物治疗7天后,与对照组相比,小鼠ACTH和CORT血清水平明显降低,尽管t-aoc水平没有明显变化。总之,口服Era (剂量范围为5-20 mg/kg) 可以减轻小鼠的抑郁和焦虑样行为,Era的抗抑郁和抗焦虑作用可能与下丘脑-垂体-肾上腺轴 (HPA) 的调节有关。

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