人体血清氧酶 (PON1) Q和R在人类冠状动脉和动脉动脉样硬化病变中选择性地降低脂质过氧化物:PON1酶和过氧化酶类活动
1Lipid Research Laboratory, Technion Faculty of Medicine, the Rappaport Family Institute for Research in the Medical Sciences, Rambam Medical Center, Haifa, Israel. aviram@tx.technion.ac.il
Circulation
|June 1, 2000
概括
人体血清氧酶 (PON1) 异型Q和R在动脉样硬化病变中降低脂质过氧化物. 这种水解表明PON1.
科学领域:
- 生物化学 生物化学
- 心血管科学 心血管科学
- 酶学 是一种酶学.
背景情况:
- 人体血清氧酶 (PON1) 在位置192 (Q/R) 和55 (M/L) 呈现多态性.
- PON1在低密度脂蛋白 (LDL) 氧化过程中起着保护作用,在这个过程中失活.
研究的目的:
- 为了比较PON1异型Q和R对人类冠状动脉和动脉病变中的脂质过氧化物含量的影响.
- 在动脉样硬化病变的背景下研究PON1的酶活性.
主要方法:
- 用PON1Q或PON1R化冠状动脉和动脉损伤同质体.
- 测量脂质过氧化物含量和PON1活性.
- 对水解产物的分析和PON1突变者的影响.
主要成果:
- 在冠状动脉病变中,PON1Q和PON1R降低了高达27%的脂质过氧化物,而在冠状动脉病变中则降低了高达16%的脂质过氧化物.
- 发生PON1Q和PON1R失活的比例分别为15%和45%.
- 通过水解和减少脂质氧化物,PON1表现出类似于酶和类似于过氧化物的活性.
结论:
- 在人体动脉样硬化病变中,PON1将脂质过氧化物水解.
- 由于其脂质过氧化物-解活性,PON1表现出抗动脉增生性质.
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