摘要
目的:探究裙带菜多糖(UPPs)对慢性不可预见性温和应激(CUMS)处理大鼠抑郁样行为及单胺类神经递质含量、氧化应激和下丘脑-腺垂体-肾上腺(HPA)轴的影响.方法:利用CUMS方法制备大鼠抑郁症模型,使用灌胃方法分别给予大鼠生理盐水(NS)、不同剂量UPPs干预.观察大鼠的一般状况并通过旷场试验(OFT)、糖水偏好试验(SPT)、强迫游泳试验(FST)检测大鼠的抑郁样行为,通过商品化试剂盒检测大鼠海马或血清中5-羟色胺(5-HT)、多巴胺(DA)和去甲肾上腺素(NE)、丙二醛(MDA)、超氧化物岐化酶(SOD)和过氧化氢酶(CAT)、促肾上腺皮质激素(ACTH)、皮质酮(CORT)活性或者水平,利用Western Blot法检测海马糖皮质激素受体(GR)蛋白的表达水平,利用苏木精-伊红(HE)染色观察大鼠海马的组织结构.结果:UPPs中、高剂量组大鼠抑郁样行为明显改善(P＜0.05),UPPs高剂量组大鼠的海马5-HT、DA、NE含量均有提高(P＜0.05),血清和海马的MDA含量均有降低(P＜0.05)、SOD和CAT活性均有提高(P＜0.05),血清ACTH、CORT含量均有降低(P＜0.05);UPPs中剂量组海马MDA、CAT,血清SOD、ACTH、CORT均有改善(P＜0.05);海马GR蛋白表达水平提升(P＜0.05);海马齿状回病理改变明显改善.结论:UPPs能减轻CUMS大鼠的抑郁样行为,其作用机制可能与提高海马单胺类神经递质含量、减轻氧化应激损伤和HPA轴亢进有关.
Abstract
Objective:To explore the effects of Undaria pinnatifida polysaccharides(UPPs)on depressive-like behavior,neurotransmitter content,oxidative stress,and the hypothalamus-pituitary-adrenal(HPA)axis in rats treated with chronic unpredictable mild stress(CUMS).Methods:A rat model of depression was prepared using the CUMS method,and rats were treated with normal saline(NS)or different doses of UPPs by gavage.The general condition of the rats was observed,and depressive-like behavior was detected by the open field test(OFT),sucrose preference test(SPT),and forced swimming test(FST).The activity or levels of 5-hydroxytryptamine(5-HT),dopamine(DA)and norepinephrine(NE),malondialdehyde(MDA),superoxide disidase(SOD)and catalase(CAT),adrenocorticotrop-ic hormore(ACTH),corticosterone(CORT)in the hippocampus or serum of rats were detected using commercial kits.Western Blot was used to detect the expression level of hippocampal glucocorticoid receptor(GR)protein,and hema-toxylin-eosin(HE)staining was used to observe the tissue structure of hippocampus of rats.Results:The depressive-like behavior of rats in the UPPs medium and high dose groups was significantly improved(P＜0.05).In the UPPs high dose group,the contents of 5-HT,DA,and NE in the hippocampus of rats increased(P＜0.05),while the con-tents of MDA in both serum and hippocampus decreased(P＜0.05),and the activities of SOD and CAT increased(P＜0.05).The contents of ACTH and CORT in serum decreased(P＜0.05).In the UPPs medium dose group,the levels of hippocampal MDA and CAT,as well as serum SOD,ACTH,and CORT were improved(P＜0.05).The expression level of GR protein in the hippocampus increased(P＜0.05),and the pathological changes in the hipp-ocampal dentate gyrus were significantly improved.Conclusion:UPPs can alleviate depressive-like behavior in CUMS rats,and its mechanism may be related to increasing the content of monoamine neurotransmitters in the hippocampus,reducing oxidative stress damage,and HPA axis hyperfunction.
基金项目
福建省自然科学基金(2020J01609)
福建医科大学国家级大学生创新训练项目(201610392012)
维普
万方数据