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Cell Rep:研究发现环境应激引起抑郁行为表观新机制

2018-12-16 佚名 科学网

长久以来,抑郁症的发病机制是困扰医学界的难题,也是当下中国正在推出的脑计划的重要研究内容。尽管目前越来越多的证据提示,抑郁症是抑郁相关遗传基因与外界环境应激相互作用引发的,但外界环境应激如何诱发抑郁发作尚不清楚。

长久以来,抑郁症的发病机制是困扰医学界的难题,也是当下中国正在推出的脑计划的重要研究内容。尽管目前越来越多的证据提示,抑郁症是抑郁相关遗传基因与外界环境应激相互作用引发的,但外界环境应激如何诱发抑郁发作尚不清楚。

2018年12月11日,国际权威杂志Cell Reports上发表的题为“Ten-eleven translocation proteins modulate the response to environmental stress in mice”的文章,揭示了外界环境刺激引起抑郁发生的表观遗传学新机制。该研究由苏州大学徐兴顺教授课题组和美国Emory大学金鹏教授课题组的研究人员合作完成。

外界环境改变引起的DNA修饰有很多种,包括甲基化,羟甲基化,乙酰化等,其中研究最多是DNA甲基化修饰。DNA羟甲基化修饰(5-hydroxymethylation, 5hmC)是新发现的一种去甲基化机制,能够逆转DNA甲基化修饰引起的基因表达抑制。DNA 5hmC修饰是由Tet(ten-eleven translocation proteins)的蛋白家族所介导,目前发现有Tet1,Tet2及Tet3三个家族成员。

该合作研究发现:外界环境刺激造成小鼠出现抑郁样行为以及前额叶皮层出现DNA 5hmC修饰的显着下降。进一步研究发现,Tet1基因敲除小鼠对外界刺激存在抵抗,不容易产生抑郁样行为,而Tet2基因敲除小鼠,即使不予外界刺激也表现出明显抑郁样症状。Tet1和Tet2催化的同一个DNA5hmC修饰反应,但Tet1/2基因敲除小鼠却表现出相反的行为表现;提示不同Tet酶介导的DNA 5hmC修饰参与小鼠抑郁样行为但存在不同的机制。

在这项研究中,研究人员对抑郁样小鼠前额叶皮层的组织进行全基因5hmC修饰测序;测序结果发现很多抑郁表型相关的差异化5hmC修饰位点。有趣的是,这些差异化5hmC修饰位点存在低氧诱导因子(Hypoxia-induced factor,HIF)的结合结构域。随后的免疫沉淀和CHIP-Seq证实了,在环境应激时Tet1酶能够增加对HIF1α的结合亲和力,进而HIF1α通过与HIF结合结构域的结合,引导Tet1酶调控抑郁相关基因的5hmC修饰动态变化,从而调控抑郁相关基因的表达和抑郁样行为表型。

该研究提供新的证据表明,外界环境应激能够通过DNA的表观修饰改变基因和蛋白的表达,最终影响了抑郁行为的发生。由于环境应激造成的表观修饰,特别是DNA 5hmC修饰是可逆的,因此该研究发现为通过作用于Tet酶这一治疗靶点,来改善抑郁症状和抑郁症患者的自杀行为等。

据悉,该课题组已经在寻找作用于TET1的药物治疗动物的抑郁样行为,为下一步将研究成果向临床转化奠定良好基础。

另外本研究的测序结果也表明,某些基因的5hmC修饰动态变化,可能成为抑郁症的生物学标记物,为抑郁症的快速和早期诊断提供重要临床价值。

徐兴顺教授课题组和金鹏教授课题组分别获得了中国科技部重大研发计划及美国NIH项目经费资助,是中美两国政府间国际科技创新合作的一部分。该国际合作项目进展顺利并取得突破成果成为中美政府间科技合作的典范。

原始出处:Cheng Y1, Sun M2, Chen L1, et al. Ten-Eleven Translocation Proteins Modulate the Response to Environmental Stress in Mice. Cell Rep. 2018 Dec 11;25(11):3194-3203.e4. 

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    2019-01-11 维他命
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NMPA:抗抑郁药的药物临床试验技术指导原则(2018年第39号)

一、概述 治疗抑郁症(Major Depressive Disorder,MDD)的药物(以下简称抗抑郁药)是全球药物研发的热点领域之一。在我国,抗抑郁药研发方兴未艾,但在临床试验设计和实施中存在诸多问题。为更好地鼓励我国抗抑郁药的创新研发,提高新药研发的质量和效率,特制订本指导原则。 本指导原则主要适用于在我国研发的抗抑郁创新药,着重对确证性临床试验设计的考虑要点提出建议,供药物研发的申

癫痫合并抑郁障碍研究进展

癫痫是神经系统常见疾病,我国癫痫患者总人数已由1990年的230万增长至2015年的984万,增长率达328%。癫痫共患病指患者同时患有非因果关联的两种及两种以上疾病,而且它们的共同患病率高于一般人群,共病提示两种疾病可能存在共同的病因病理机制。

Diabetic Med:2型糖尿病患者抑郁障碍的患病率和相关性?

近日,国际杂志 《Diabetic Med》上在线发表一项关于2型糖尿病患者抑郁障碍的患病率和相关性:糖尿病和抑郁症国际流行和治疗(INTERPRET-DD)研究的结果,这项研究是在14个国家开展的一项合作研究。研究目的是评估不同国家2型糖尿病患者抑郁症的患病率和管理情况。 在14个国家招募18-65岁患有糖尿病并在门诊接受治疗的人并接受了精神病学访谈。参与者完成了患者健康问卷和糖尿病量问题

抑郁了 泡个热水澡真能缓解?

对于上班族来说,每天最解乏的事情莫过于回到家,美美地泡个热水澡了吧。最近有研究发现,泡热水澡可以改善抑郁症,而且这种改善是长久的。抑郁症是最常见的心理健康问题之一,全球抑郁症患者高达3.22亿,是世界第四大疾病,预计到2020年将成为第二大疾病。全球每年自杀人数高达80万。在短短几分钟内,世界各地已至少有6人自杀身亡。在我国,人们对于抑郁症的了解还远远不够,对抑郁症的医疗防治还处在识别率低的局面,

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