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The affinities of estradiol for the ERs are high (around 0.1 nM), and there is a relatively low quantity of about 10,000 to 20,000 ERs in the cytoplasm per cell in estrogen target tissues. [20] Estradiol stays bound to the ERs for about 24 hours, which is longer than that of other estrogens such as estriol (6 hours). [1]
[85] [93] [94] In 1935, the name estradiol and the term estrogen were formally established by the Sex Hormone Committee of the Health Organization of the League of Nations; this followed the names estrone (which was initially called theelin, progynon, folliculin, and ketohydroxyestrin) and estriol (initially called theelol and trihydroxyestrin ...
Estriol (E3), also spelled oestriol, is a steroid, a weak estrogen, and a minor female sex hormone. [1] [2] It is one of three major endogenous estrogens, the others being estradiol and estrone. [1] Levels of estriol in women who are not pregnant are almost undetectable. [3]
Estradiol (E2) is a medication and naturally occurring steroid hormone. [11] [12] [13] It is an estrogen and is used mainly in menopausal hormone therapy and to treat low sex hormone levels in women.
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.
Estradiol decanoate, estradiol cyclooctyl acetate, estradiol 3-saccharinylmethyl ether, and EC508 (estradiol 17β-(1-(4-(aminosulfonyl)benzoyl)-L-proline)) are estradiol esters and novel oral forms of estradiol that have been developed with improved properties, such as greater bioavailability and reduced first-pass effect.
An estrogen ester is an ester of an estrogen, most typically of estradiol but also of other estrogens such as estrone, estriol, and even nonsteroidal estrogens like diethylstilbestrol. [1] [2] [3] Esterification renders estradiol into a prodrug of estradiol with increased resistance to first-pass metabolism, slightly improving its oral ...
Estradiol, the base estrogen of most estrogen esters. This is a list of estrogen esters , or ester prodrugs of estrogens . It includes esters, as well as ethers , of steroidal estrogens like estradiol , estrone , and estriol and of nonsteroidal estrogens like the stilbestrols diethylstilbestrol and hexestrol .
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