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在甲氨酸合成酶缺乏的小鼠中,脑血管功能障碍.

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概括

氨酸合成酶 (MS) 缺乏或叶酸含量低会损害小鼠内皮功能. 这导致氧化应激和减少大脑血管扩张.

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科学领域:

  • 生物化学 生物化学
  • 身体生理学 身体生理学
  • 神经科学是一个神经科学.

背景情况:

  • 甲氨酸合成酶 (MS) 对于将同型半氨酸重甲基化为甲氨酸至关重要,这是依赖叶酸的过程.
  • 内皮功能障碍与各种心血管和神经疾病有关.

研究的目的:

  • 为了研究是否受损的甲氨酸合成酶 (MS) 功能会影响小鼠内皮功能.
  • 确定叶酸可用性在MS缺乏引起的内皮功能障碍中的作用.

主要方法:

  • 使用了对Mtr基因 (编码MS) 异合体的小鼠和野生类型的 littermates.
  • 管理的对照和低叶酸 (LF) 饮食.
  • 使用显微镜评估大脑动脉向乙胆的扩张.
  • 在大脑动脉小动脉中量化超氧化物和过氧化水平.

主要成果:

  • 患有MS缺乏症的小鼠 (Mtr(+/-)) 与控制饮食中的野生类型 (Mtr(+/+)) 小鼠相比,表现出脑动脉扩张.
  • 在LF饮食中的Mtr(+/+) 和Mtr(+/-) 两只小鼠都表现出动脉扩张受损.
  • 在接受控制饮食的Mtr(+/-) 小鼠和接受LF饮食的两种基因型中观察到氧化应激标志物 (超氧化物,过氧化) 的升高.

结论:

  • 缺陷的homocysteine重甲基化,无论是由于MS缺乏或叶酸缺乏,都会导致氧化应激.
  • 这种氧化压力导致小鼠大脑微循环中的内皮功能障碍.