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.
Similar content being viewed by others
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
References
Hubel, C.A., Roberts, J.M., Taylor, R.N., Musci, T.J., Rogers, G.M., and McLaughlin, M.K. (1989) Lipid Peroxidation in Pregnancy: New Perspectives on Preeclampsia, Am. J. Obstet. Gynecol. 161, 1025–1034.
Tanaka, A., Morikawa, H., Yamasaki, M., and Mochizuki, M. (1996) Lipid Metabolism and Endothelial Cell Dysfunction in Women with Preeclampsia, Folia Endocrinol. 72, 85–94.
Komura, S., Ohishi, N., and Yagi, K. (1996) Catecholestrogen as a Natural Antioxidant, Ann. N.Y. Acad. Sci. 786, 419–429.
Kono, S., Merriam, G.R., Brandon, D., Loriaux, D.L., and Lipsett, M.B. (1982) Radioimmunoassay and Metabolism of the Catechol Estrogen 2-Hydroxyestradiol, J. Clin. Endocrinol. Metab. 54, 150–154.
Takanashi, K., Watanabe, K., and Yoshizawa, I. (1993) Conversion of Estradiol 17-Sulfate to Its 2- and 4-Hydroxylated Catechols by Human Placental Microsomes, Biol. Pharm. Bull. 16, 217–219.
Takanashi, K., Watanabe, K., and Yoshizawa, I. (1995) On the Inhibitory Effect of C17-Sulfoconjugated Catecholestrogens upon Lipid Peroxidation of Rat Liver Microsomes, Biol. Pharm. Bull. 18, 1120–1125.
Kashiwagi, T., Yasuda, J., Yamamoto, T., Honjo, H., Takanashi, K., and Yoshizawa, I. (1999) Serum 2-Hydroxyestradiol 17-Sulphate in Pregnancy, Endocr. J. 46, 453–458.
Takanashi, K., Honma, T., Kashiwagi, T., Honjo, H., and Yoshizawa, I. (2000) Detection and Measurement of Urinary 2-Hydroxyestradiol 17-Sulfate, the Potential Placental Antioxidant During Pregnancy, Clin. Chem. 46, 373–378.
Watanabe, K., Kimura, R., and Yoshizawa, I. (1986) Synthesis and High-Performance Liquid Chromatography of 3,4-Guaiacol Estrogen Sulfates, Chem. Pharm. Bull. 34, 2231–2235.
Buege, J.A., and Aust, S.D. (1978) Microsomal Lipid Peroxidation, Methods Enzymol. 52, 302–310.
Takanashi, K., Watanabe, K., Itoh, S., Kamada, M., Honma, T., and Yoshizawa, I. (1995) HPLC Separation of Ring D Conjugated Estrogens, Bunseki Kagaku 44, 793–796.
Heyns, W., Baelen, H.V., and DeMoor, P. (1967) Study of Steroid-Protein Binding by Means of Competitive Adsorption: Application to Cortisol Binning in Plasma, Clin. Chim. Acta 18, 361–370.
Watanabe, K., Takanashi, K., and Yoshizawa, I. (1989) Plasma Estradiol 17-Sulfate and 2-Hydroxyestradiol 17-Sulfate Levels and Their Metabolic Clearance Rates in Rats, J. Steroid Biochem. 32, 823–827.
Ball, P., Emons, G., Kayser, H., and Teichmann, J. (1983) Metabolic Clearance Rates of Catechol Estrogens in Rats, Endocrinology 113, 1781–1783.
Dunn, J.F., Merriam, G.R., Eil, C., Kono, S., Loriaux, D.L., and Nisula, B.C. (1980) Testosterone-Estradiol Binding Globulin Binds to 2-Methoxyestradiol with Greater Affinity Than to Testosterone, J. Clin. Endocrinol. Metab. 51, 404–406.
Kono, S., Merriam, G.R., Brandon, D.D., Loriaux, D.L., Lipsett, M.B., and Fujino, T. (1983) Radioimmunoassay and Metabolic Clearance Rate of Catecholestrogens, 2-Hydroxyestrone and 2-Hydroxyestradiol in Man, J. Steroid Biochem. 19, 627–633.
Ball, P., and Knuppen, R. (1980) Catecholestrogens, Acta Endocrinol. 93 (Suppl. 232), 1–127.
Hoffman, A.R., Paul, S.M., and Axelrod, J. (1980) The Enzymatic Formation of Catechol Estrogens from 2-Methoxyestrogens by Rat Liver Microsomes, Endocrinology 107, 1192–1197.
Ball, P., Stubenrauch, G., and Knuppen, R. (1977) Metabolism of 2-Methoxy- and 4-Methoxyoestrone in Man in vivo, J. Steroid Biochem. 8, 989–993.
Author information
Authors and Affiliations
Corresponding author
About this article
Cite this article
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
Received:
Revised:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/s11745-003-1135-4