According to the latest survey, promoting regeneration of hippocampal endogenous nerve may be the most effective therapy for treating depression. It is an important way for antidepressants to enhancing neuronal plasticity by acting on Wnt signal pathway. A lot of researches show that electroacupuncture can promote hippocampal neurogenesis of depressive rats. Relevant researches also point out that electroacupuncture can induce directed differentiation of NSCs, but its mechanism is not clear. Therefore, a hypothesis is proposed that regulating Wnt signal transduction pathway, promoting proliferation and differentiation of hippocampal endogenous NSCs and neuronal plasticity may be one of the important mechanisms for treating depression by acupuncture. Based on this point, electroacupuncturing at Baihui and Shenting of rats is observed. Establish Fluoxetine control group and adopt immunohistochemistry , double-labeled fluorescent staining , Western-blot and Real-time PCR methods to observe the effect of electroacupuncture on expression of NeuN, GFAP, Wnt1, GSK-3βand β-catenin. Wnt channel antagonists are also introduced to deeply explore the regulative effect of Wnt channel on mechanism of hippocampal neuronal plasticity by electroacupuncture for treating depression. Mechanism of electroacupuncture for anti-depression is revealed from a new perspective of promoting NSCs prolifertation and its signal transduction pathway in order to provide brand-new scientific evidence for treating depression by electroacupuncture and expand scientific space.
最新研究发现,促进海马内源性神经再生可能是治疗抑郁症最有效方法,通过作用于Wnt信号通路提高神经元可塑性是抗抑郁药作用重要途径。电针治疗抑郁症疗效确切,研究表明电针可以促进抑郁大鼠海马神经发生,并可诱导神经干细胞(NSCs)定向分化,但电针促进抑郁症海马神经重塑作用机制尚未阐明。为此我们提出假说:调控Wnt信号转导通路,促进海马内源性NSCs增殖分化可能是电针抗抑郁作用的重要机制。通过电针干预(通督调神法),设立氟西汀对照组,采用免疫组化、免疫荧光双标、Western-blot和Real-time PCR等方法,观察电针对NeuN、GFAP、Wnt1、GSK-3β和β-catenin表达影响,并引入Wnt通路拮抗剂,深入探讨Wnt通路在电针抗抑郁海马神经重塑机制中的调控作用,旨在从促进NSCs增殖分化和其信号转导通路全新视角揭示电针抗抑郁机制,为电针治疗抑郁症提供全新科学佐证,拓展学术空间
最新研究发现,促进海马神经再生可能是治疗抑郁症最有效方法,电针作为中医特色疗法之一,已被证实对抑郁症临床治疗有一定疗效,并有研究表明电针可以促进抑郁症海马神经重塑,通过作用于Wnt信号通路提高神经可塑性是抗抑郁药作用重要途径,电针是否也通过调控Wnt信号通路达到促进海马神经重塑发挥抗抑郁效应呢?基于该假说,我们设计了本实验。本研究采用电针干预,并设立氟西汀对照组,通过透射电镜、免疫组化、Western-blot和Real-time PCR等方法,观察电针对抑郁模型大鼠海马神经再生、行为学、Wnt1、GSK-3β和β-catenin表达影响,并引入Wnt通路拮抗剂,深入探讨Wnt/β-catenin通路在电针抗抑郁海马神经重塑机制中的调控作用。研究结果显示,在7 d、14 d、21 d实验中,模型组大鼠open-field test评分、糖水消耗量、体质量均较空白组明显降低(均P<0.01),而电针组、西药组大鼠open-field test评分、糖水消耗量、体质量均较模型组明显提高(均P<0.01)。在7 d、14 d、21 d实验中,模型组大鼠海马CA3区突触数量均较空白组明显减少(均P<0.01),而在14 d、21 d电针组大鼠海马CA3区突触数量均较模型组明显增加(均P<0.01),电针组抑郁大鼠的神经元萎缩情况开始得到抑制,并改善神经元细胞膜固缩现象,使突触小泡增加,突触间隙减小,后膜致密物质增厚,故本研究认为,电针对抑郁模型大鼠神经突触具有可塑性,并对抑郁症症状改善起到促进作用。通过对Wnt/β-catenin信号通路关键指标基因和蛋白表达的观察可见,与空白组相比,7d、14d、21d模型组大鼠Wnt1、β-catenin水平显著降低,7d、21d模型组大鼠GSK-3β水平显著升高;与模型组相比,7d、14d、21d电针组、西药组大鼠Wnt1、β-catenin水平显著升高,7d、21d电针组、西药组大鼠GSK-3β水平显著降低。实验结果表明,模型组大鼠在CUMS造模过程中,Wnt1蛋白呈现缺乏状态,脑内GSK-3β活性增强,进而阻断β-catenin磷酸化,故Wnt1、β-catenin呈低水平。电针对Wnt/β-catenin信号通路具有调控作用,可能是促进海马神经重塑和抗抑郁重要机制之一。
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数据更新时间:2023-05-31
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