Antioxidant protection of lipoproteins containing estrogens: in vitro evidence for low- and high-density lipoproteins as estrogen carriers.

Antioxidant protection of lipoproteins containing estrogens: in vitro evidence for low- and high-density lipoproteins as estrogen carriers.
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含有雌激素的脂蛋白的抗氧化保护:低密度和高密度脂蛋白作为雌激素载体的体外证据。

DOI:
10.1016/s1388-1981(99)00108-0
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发表时间:
1999
期刊:
Biochimica et biophysica acta
影响因子:
--
通讯作者:
Tikkanen,MJ
Tikkanen,MJ
中科院分区:
--
文献类型:
--
作者:
Meng,QH;Höckerstedt,A;Heinonen,S;Wähälä,K;Adlercreutz,H;Tikkanen,MJ

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最近的一些研究报告称,从接受雌激素治疗的绝经后妇女中分离出的低密度脂蛋白(LDL)表现出离体抗氧化性增强。然而,造成这种效应的根本机制尚不清楚。我们探索了 17β-雌二醇 (E2) 的亲脂性衍生物可以掺入 LDL 和高密度脂蛋白 (HDL) 颗粒中抑制脂蛋白氧化的可能性。通过在血浆中孵育游离E2和E217-硬脂酸酯将少量酯化E2引入脂蛋白中不会产生任何抗氧化作用。使用人工转移系统(硅藻土分散体),可以将大量的 E2 酯掺入脂蛋白中。 E217-硬脂酸酯的浓度范围为0.27至1.38分子/LDL颗粒,E217-油酸酯的浓度范围为0.36至1.93分子/LDL颗粒,导致Cu2+诱导的LDL抗氧化性增加,如统计学上显着的滞后时间延长所示。使用硅藻土作为转移系统掺入 E2 酯后,还观察到 HDL 的滞后时间显着延长。我们的结果表明,在血浆中孵育期间,游离的 E2 可以被酯化并掺入脂蛋白中。然而,需要通过人工转移系统将超生理浓度的E2酯掺入脂蛋白中,以降低其氧化敏感性。
Some recent studies have reported that low-density lipoprotein (LDL) isolated from estrogen-treated postmenopausal women exhibited increased oxidation resistance ex vivo. However, the underlying mechanisms responsible for this effect are not clear. We explored the possibility that lipophilic derivatives of 17β-estradiol (E2) could be incorporated into LDL and high-density lipoprotein (HDL) particles inhibiting lipoprotein oxidation. Introduction of small amounts of esterified E2into lipoproteins by means of incubation of free E2and E217-stearate in plasma did not result in any antioxidant effect. Using an artificial transfer system (Celite dispersion), larger amounts of E2esters could be incorporated into lipoproteins. Concentrations ranging between 0.27 and 1.38 molecules/LDL particle for E217-stearate and between 0.36 and 1.93 molecules/LDL particle for E217-oleate resulted in increased Cu2+-induced oxidation resistance of LDL as indicated by statistically significant lag time prolongations. Significant prolongations of lag times were also observed for HDL following incorporation of E2esters using Celite as transfer system. Our results suggest that free E2can be esterified and incorporated into lipoproteins during incubation in plasma. However, incorporation of supraphysiologic concentrations of E2esters into lipoproteins by means of the artificial transfer system was required in order to reduce their oxidation susceptibility.
雌激素生理浓度对 LDL 的抗氧化保护对 17-β-雌二醇具有特异性。
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