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没有结合的心脏氧化合成酶介导透支功能障碍.

Gad A Silberman1, Tai-Hwang M Fan, Hong Liu

  • 1Department of Medicine (Division of Cardiology), Emory University School of Medicine, Atlanta, GA, USA.

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|January 20, 2010
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概括

甲基生物素 (BH(4)) 缺乏有助于高血压中的心脏氧化和心脏扩张功能障碍. 补充BH(4) 改善心脏功能,建议它作为一种潜在的治疗心力衰竭与保存的喷射分数.

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科学领域:

  • 心血管生理学心血管生理学
  • 氧化压力生物学 氧化压力生物学
  • 药理学 药理学 是一个学科.

背景情况:

  • 高血压是导致心力衰竭的主要原因,具有保存的射出分数,其特征是心脏扩张性放松受损.
  • 由于未合的NO合成酶 (NOS) 导致氧化 (NO) 生物可用性降低,这通常是由四二二丁 (BH(4)) 耗尽引起的,这与扩张性功能障碍有关.
  • 氧化应激和BH(4) 缺乏可能会损害心脏透静功能,独立于血管效应.

研究的目的:

  • 为了研究心脏氧化和BH(4) 缺乏在高血压诱导的扩张功能障碍中的作用.
  • 探索BH的治疗潜力(4) 补充治疗腹功能障碍.

主要方法:

  • 使用高血压小鼠模型 (单侧腎切除术,脱氧皮质酸颗粒,盐水饮用) 来评估心脏功能,氧化和NOS合.
  • 测量了心脏BH(4) 水平,氧化生物,NO和超氧化物生产,以及斯福兰班酸化.
  • 给高血压小鼠服用BH(4),并评估其对心脏功能和分子标记物的影响.
  • 进行了孤立心肌细胞实验,以评估放松特性.

主要成果:

  • 患有高血压的小鼠表现出透支功能障碍,心脏氧化,心脏BH降低,以及未结合的NOS与降低的NO产量.
  • BH(4) 补充剂,但不含拉或四氨,改善了心脏BH(4) 水平,斯福兰班酸化和透缩功能.
  • 隔离的心肌细胞显示放松功能受损,BH治疗使其正常化.
  • 心脏特异性血管酶转化酶的过度表达诱导了类似的氧化和扩张功能障碍表型.

结论:

  • 独立于血管因素的心脏氧化,可以导致未结合的NOS和扩张性功能障碍.
  • 水生物素 (BH(4)) 补充是一种有前途的治疗策略,用于与高血压相关的舒张功能障碍.