LCAT facilitates transacylation of 17 beta-estradiol in the presence of HDL3 subfraction.

LCAT facilitates transacylation of 17 beta-estradiol in the presence of HDL3 subfraction.
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LCAT 在 HDL3 亚组分存在的情况下促进 17 β-雌二醇的转酰基化。

DOI:
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发表时间:
2002
影响因子:
6.5
通讯作者:
M. Jauhiainen
M. Jauhiainen
中科院分区:
生物学2区
文献类型:
--
作者:
A. Höckerstedt;M. Tikkanen;M. Jauhiainen

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已经表明,雌激素需要代谢成其疏水性雌激素酯衍生物,以在脂蛋白中充当抗氧化剂。数据表明,17 β-雌二醇(E(2))在LCAT诱导的反应中被酯化,酯通过CETP依赖性机制从HDL颗粒转运到LDL和VLDL颗粒。在本研究中,我们进一步研究了LCAT对E(2)酯化反应的调节作用,并重点研究了HDL结构和组成在酯化过程中的重要性。将分离的LDL、HDL(2)、HDL(3)和重建的盘状HDL(rHDL)与标记的E(2)(含或不含纯化的LCAT)在37 ℃下孵育24小时。纯化脂蛋白组分后,有一个显著的放射性峰,代表酯化雌二醇附着在HDL(3)和rHDL上,但HDL(2)和LDL仅含有痕量的标记雌二醇酯。TLC分析证实,放射性迁移至与17 β-E(2)17-单酯标准品对应的位置。加入纯化LCAT后,HDL(3)和代表酯化E(2)的rHDL相关放射性量显著增加。然而,在HDL(2)和LDL中仅观察到有限的放射性增加。总之,HDL亚组分不同的潜力,调节雌二醇酯化LCAT。
It has been shown that estrogens need to be metabolized to their hydrophobic estrogen ester derivatives to act as antioxidants in lipoproteins. Data suggest that 17beta-estradiol (E(2)) becomes esterified in LCAT-induced reactions and the esters are transported from HDL particles to LDL and VLDL particles by a CETP-dependent mechanism. In the present study we have further investigated the regulation of E(2) esterification by LCAT and focused on the importance of HDL structure and composition in the esterification process. Isolated LDL, HDL(2), HDL(3), and reconstituted discoidal HDL (rHDL) were incubated with labeled E(2), with and without purified LCAT, at 37 degrees C for 24 h. After purification of the lipoprotein fractions, there was a significant peak of radioactivity representing esterified estradiol attached to HDL(3) and rHDL, but HDL(2) and LDL contained only trace amounts of labeled estradiol ester. TLC analysis confirmed that the radioactivity migrated in a position corresponding to that of 17beta-E(2) 17-monoester standard. The amount of radioactivity associated with HDL(3) and rHDL representing esterified E(2) was significantly increased by addition of purified LCAT. However, only limited increases of radioactivity were observed in HDL(2) and LDL. In conclusion, HDL subfractions differ in their potential to regulate estradiol esterification by LCAT.
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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