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Circulation:白藜芦醇矛盾地降血压机制

2019-07-11 MedSci MedSci原创

白藜芦醇是一种天然多酚,具有促进健康和限制疾病的能力,因此人们对了解其治疗作用的机制很感兴趣。白藜芦醇的多酚环能与其他有害氧化剂反应并解毒。虽然白藜芦醇的保护作用通常归因于其抗氧化活性,但近期研究表明这是一种误解。研究人员在分离的大鼠动脉平滑肌细胞中评估白藜芦醇氧化cGMP依赖性PKG1α(蛋白激酶1α)的能力,并通过体外实验、质朴和MRI来研究其作用机制。结果显示,白藜芦醇酚环的氧化矛盾地导致了

白藜芦醇是一种天然多酚,具有促进健康和限制疾病的能力,因此人们对了解其治疗作用的机制很感兴趣。白藜芦醇的多酚环能与其他有害氧化剂反应并解毒。虽然白藜芦醇的保护作用通常归因于其抗氧化活性,但近期研究表明这是一种误解。

研究人员在分离的大鼠动脉平滑肌细胞中评估白藜芦醇氧化cGMP依赖性PKG1α(蛋白激酶1α)的能力,并通过体外实验、质朴和MRI来研究其作用机制。

结果显示,白藜芦醇酚环的氧化矛盾地导致了蛋白质的氧化修饰,其原因是反应性醌的形成氧化了半胱氨酸残基的巯基侧链;在细胞氧化应激下增强的反应。与上述观察结果及其诱导血管扩张的能力一致,白藜芦醇可诱导高血压的野生型小鼠氧化激活PKG1α和降低血压,但对于二硫化活化耐受的C42S PKG1α敲入小鼠则没有相似的效益。

总而言之,白藜芦醇通过矛盾地诱导蛋白质氧化来降低血压,特别是在氧化应激时,这可能是抗氧化分子的一个共同特征。

原始出处:

Oleksandra Prysyazhna,et al. Blood Pressure–Lowering by the Antioxidant Resveratrol Is Counterintuitively Mediated by Oxidation of cGMP-Dependent Protein Kinase. https://doi.org/10.1161/CIRCULATIONAHA.118.037398Circulation. 2019;140:126–137

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    2019-07-14 午夜星河

    明白了

    0

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    2019-07-12 飛歌

    学习了很有用不错

    0

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    2019-07-12 183****7028

    学习

    0

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    2019-07-12 183****7028

    学习

    0

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    2019-07-12 phoebeyan520

    学习了

    0

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    2019-07-11 医者仁心5538

    学习了

    0

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