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Comparison of ex vivo inhibitory effect between 2-hydroxyestradiol and its 17-sulfate on rat hepatic microsomal lipid peroxidation

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Lipids

Abstract

Two endogenous antioxidants that are speculated to be defense substances against preeclampsia, 2-hydroxyestradiol (2-OH-E2) and its 17-sulfate, 2-hydroxyestradiol 17-sulfate (2-OH-E2-17-S), were administered to rats to compare their inhibitory effects on hepatic microsomal lipid peroxidation, and the lipid peroxides were determined in NADPH- and ascorbic acid-dependent systems. The two catechols showed a strong inhibitory effect on lipid peroxidation in both systems, and the effect was dose dependent. However, a large difference was observed in their inhibition patterns. After administration of 2-OH-E2, the effect appeared immediately and decreased gradually with time. In contrast, the effect of 2-OH-E2-17-S appeared some time after administration and persisted for a longer time. Both catechols also showed a striking difference in their dynamics. After administration, 2-OH-E2 was detected in the blood together with its metabolites, 2-methoxyestradiol and 2-methoxyestrone, and they disappeared immediately. In contrast, 2-OH-E2-17-S was present in the blood for a longer time together with its O-methylated product, 2-methoxyestradiol 17-sulfate, but disappeared from liver microsomes within 2 h after administration. The results imply no occurrence of a direct inhibition effect of 2-OH-E2-17-S.

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Abbreviations

2-OH-E1 :

2-hydroxyestrone

2-OH-E2 :

2-hydroxyestradiol

2-OMe-E1 :

2-methoxyestrone

2-OMe-E2 :

2-methoxyestradiol

4-OMe-E2 :

4-methoxyestradiol

2-OH-E2-17-S:

2-hydroxyestradiol 17-sulfate

2-OMe-E2-17-S:

2-methoxyestradiol 17-sulfate

4-OMe-E2-17-S:

4-methoxyestradiol 17-sulfate

AsA:

ascorbic acid

COMT:

catechol O-methyl transferase

TBA:

2-thiobarbituric acid

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Correspondence to Itsuo Yoshizawa.

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Takanashi, K., Osanai, Y., Kyo, T. et al. Comparison of ex vivo inhibitory effect between 2-hydroxyestradiol and its 17-sulfate on rat hepatic microsomal lipid peroxidation. Lipids 38, 847–854 (2003). https://doi.org/10.1007/s11745-003-1135-4

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  • DOI: https://doi.org/10.1007/s11745-003-1135-4

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