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相关概念视频

Introduction to Mechanisms of Enzyme Catalysis01:13

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For many years, scientists thought that enzyme-substrate binding took place in a simple "lock-and-key" fashion. This model stated that the enzyme and substrate fit together perfectly in one instantaneous step. However, current research supports a more refined view scientists call induced fit. The induced-fit model expands upon the lock-and-key model by describing a more dynamic interaction between enzyme and substrate. As the enzyme and substrate come together, their interaction causes...
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Chemical reactions often occur in a stepwise fashion involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs. Each of the steps in a reaction mechanism is called an elementary reaction. These...
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Indirect-acting cholinergic agonists work by interacting with an enzyme called acetylcholinesterase (AChE) in the synaptic cleft. They can be reversible or irreversible inhibitors and have different effects on the enzyme.
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在 AHR 中介的 m

Cheng Ji1, Yizhou Tao1, Xiaoxiao Li2

  • 1Suzhou Medical College, Soochow University, Suzhou, China.

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概括
此摘要是机器生成的。

微粒物质 (PM2.5) 暴露会通过通过烯碳水化合物受体 (AHR) 改变m6ARNA甲基化,从而损害心脏发育. 这导致斑马鱼幼虫的亡和心脏缺陷.

关键词:
美国人权委员会 (AHR)心脏的发展心脏的发育M(6) 一种RNA甲基化.在PM{2.5) 中,斑马鱼是一种斑马鱼.

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科学领域:

  • 环境毒理学环境毒理学
  • 分子生物学分子生物学
  • 发展生物学 发展生物学

背景情况:

  • 环境细颗粒物 (PM2.5) 与抑制心脏发育有关.
  • 导致PM2.5心脏毒性的精确分子机制尚未完全理解.
  • N6-甲基氨酸 (m6A) RNA甲基化对细胞过程和发育至关重要.

研究的目的:

  • 调查m6ARNA甲基化在PM2.5引起的心脏发育毒性的作用.
  • 阐明连接PM2.5暴露与心脏缺陷的分子通路.

主要方法:

  • 斑马鱼幼虫暴露于从PM2.5.5中提取的有机物质 (EOM).
  • 测量包括全球m6ARNA甲基化水平,活性氧物种 (ROS) 生成,线粒体损伤和亡.
  • 基因表达分析的重点是甲基转移酶 (METTL14,METTL3),酸受体 (AHR) 和与亡相关的基因 (traf4a,bbc3).
  • 药理干预包括贝他因 (甲基供体) 和CH223191 (AHR抑制剂).
  • 用基因敲除和强制表达来评估基因功能.

主要成果:

  • 在斑马鱼中,PM2.5 EOM显著降低了心脏m6A RNA甲基化.
  • 贝他因治疗恢复了m6A水平,并减弱了EOM诱导的ROS,线粒体损伤,亡和心脏缺陷.
  • EOM激活了AHR,抑制了METTL14和METTL3的转录,导致全基因组的m6A变化.
  • 抑制AHR缓解了异常的m6A甲基化.
  • EOM上调了与亡相关的基因traf4a和bbc3;强制METTL14表达恢复了它们的水平.
  • 淘汰traf4a或bbc3减少了EOM诱导的ROS和亡.

结论:

  • 暴露于PM2.5会通过m6ARNA甲基化变化诱导心脏形.
  • 该机制涉及AHR介导的METTL14下调,从而增加了traf4a和bbc3的表达.
  • 这导致了亡和随后的心脏缺陷,突出了m6ARNA甲基化作为PM2.5心脏毒性的关键媒介.