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Estradiol (E2), also called oestrogen, oestradiol, is an estrogen steroid hormone and the major female sex hormone. It is involved in the regulation of female reproductive cycles such as estrous and menstrual cycles .
The four major naturally occurring estrogens in women are estrone (E1), estradiol (E2), estriol (E3), and estetrol (E4). Estradiol (E2) is the predominant estrogen during reproductive years both in terms of absolute serum levels as well as in terms of estrogenic activity.
Aromatase (EC 1.14.14.14), also called estrogen synthetase or estrogen synthase, is an enzyme responsible for a key step in the biosynthesis of estrogens. It is CYP19A1 , a member of the cytochrome P450 superfamily, which are monooxygenases that catalyze many reactions involved in steroidogenesis .
The metabolic clearance rate of a steroid is defined as the volume of blood that has been completely cleared of the hormone per unit time. The production rate of a steroid hormone refers to entry into the blood of the compound from all possible sources, including secretion from glands and conversion of prohormones into the steroid of interest ...
11β-Hydroxysteroid dehydrogenase (1, 2) – corticosteroid synthesis and metabolism; 17β-Hydroxysteroid dehydrogenase (1–15) – androgen, estrogen, and progestogen synthesis and metabolism; 20α-Hydroxysteroid dehydrogenase – progestogen synthesis and metabolism; 20β-Hydroxysteroid dehydrogenase – progestogen synthesis and metabolism
The pharmacology of estradiol, an estrogen medication and naturally occurring steroid hormone, concerns its pharmacodynamics, pharmacokinetics, and various routes of administration. [1] [2] [3] Estradiol is a naturally occurring and bioidentical estrogen, or an agonist of the estrogen receptor, the biological target of estrogens like endogenous ...
Estradiol levels with rectal administration of estradiol in women after a single 1 mg dose 3 hours post-dose, with 0.5 mg/day 6 hours after the last dose, and with 1 mg/day 6 hours after the last dose. [261] [72] [242] [70] Estradiol has been assessed for use by rectal administration in a number of studies.
Estetrol is a major estrogen in the body. [ 1 ] [ 2 ] In contrast to estrone and estradiol, estetrol is a native estrogen of fetal life. Estetrol is produced exclusively by the fetal liver [ 1 ] and is found in detectable levels only during pregnancy, with relatively high levels in the fetus and lower levels in the maternal circulation.
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