4-Methoxyestradiol

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4-Methoxyestradiol
4-Methoxyestradiol.svg
Names
IUPAC name
4-Methoxyestra-1,3,5(10)-triene-3,17β-diol
Systematic IUPAC name
(1S,3aS,3bR,9bS,11aS)-6-Methoxy-11a-methyl-2,3,3a,3b,4,5,9b,10,11,11a-decahydro-1H-cyclopenta[a]phenanthrene-1,7-diol
Other names
4-ME2; 4-MeOE2; 4-MeO-E2; 4-Methoxy-17β-estradiol; Estra-1,3,5(10)-trien-3,4,17β-triol 4-methyl ether
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
PubChem CID
  • InChI=1S/C19H26O3/c1-19-10-9-12-11-5-7-16(20)18(22-2)14(11)4-3-13(12)15(19)6-8-17(19)21/h5,7,12-13,15,17,20-21H,3-4,6,8-10H2,1-2H3/t12-,13-,15+,17+,19+/m1/s1
    Key: BCWZIZLVBYHFES-PYEWSWHRSA-N
  • C[C@]12CC[C@H]3[C@H]([C@@H]1CC[C@@H]2O)CCC4=C3C=CC(=C4OC)O
Properties
C19H26O3
Molar mass 302.414 g·mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

4-Methoxyestradiol (4-ME2) is an endogenous, naturally occurring methoxylated catechol estrogen and metabolite of estradiol that is formed by catechol O-methyltransferase via the intermediate 4-hydroxyestradiol. [1] [2] [3] It has estrogenic activity similarly to estrone and 4-hydroxyestrone. [4]

Contents

Selected biological properties of endogenous estrogens in rats
Estrogen ER RBA (%) Uterine weight (%) Uterotrophy LH levels (%) SHBG RBA (%)
Control–100–100–
Estradiol (E2) 100506 ± 20+++12–19100
Estrone (E1) 11 ± 8490 ± 22+++ ?20
Estriol (E3) 10 ± 4468 ± 30+++8–183
Estetrol (E4) 0.5 ± 0.2 ?Inactive ?1
17α-Estradiol 4.2 ± 0.8 ? ? ? ?
2-Hydroxyestradiol 24 ± 7285 ± 8+b31–6128
2-Methoxyestradiol 0.05 ± 0.04101Inactive ?130
4-Hydroxyestradiol 45 ± 12 ? ? ? ?
4-Methoxyestradiol1.3 ± 0.2260++ ?9
4-Fluoroestradiol a180 ± 43 ?+++ ? ?
2-Hydroxyestrone 1.9 ± 0.8130 ± 9Inactive110–1428
2-Methoxyestrone 0.01 ± 0.00103 ± 7Inactive95–100120
4-Hydroxyestrone 11 ± 4351++21–5035
4-Methoxyestrone 0.13 ± 0.04338++65–9212
16α-Hydroxyestrone 2.8 ± 1.0552 ± 42+++7–24<0.5
2-Hydroxyestriol 0.9 ± 0.3302+b ? ?
2-Methoxyestriol 0.01 ± 0.00 ?Inactive ?4
Notes: Values are mean ± SD or range. ERRBA = Relative binding affinity to estrogen receptors of rat uterine cytosol. Uterine weight = Percentage change in uterine wet weight of ovariectomized rats after 72 hours with continuous administration of 1 μg/hour via subcutaneously implanted osmotic pumps. LH levels = Luteinizing hormone levels relative to baseline of ovariectomized rats after 24 to 72 hours of continuous administration via subcutaneous implant. Footnotes:a = Synthetic (i.e., not endogenous). b = Atypical uterotrophic effect which plateaus within 48 hours (estradiol's uterotrophy continues linearly up to 72 hours). Sources: See template.

See also

Related Research Articles

<span class="mw-page-title-main">Estradiol sulfate</span> Chemical compound

Estradiol sulfate (E2S), or 17β-estradiol 3-sulfate, is a natural, endogenous steroid and an estrogen ester. E2S itself is biologically inactive, but it can be converted by steroid sulfatase into estradiol, which is a potent estrogen. Simultaneously, estrogen sulfotransferases convert estradiol to E2S, resulting in an equilibrium between the two steroids in various tissues. Estrone and E2S are the two immediate metabolic sources of estradiol. E2S can also be metabolized into estrone sulfate (E1S), which in turn can be converted into estrone and estradiol. Circulating concentrations of E2S are much lower than those of E1S. High concentrations of E2S are present in breast tissue, and E2S has been implicated in the biology of breast cancer via serving as an active reservoir of estradiol.

<span class="mw-page-title-main">2-Hydroxyestradiol</span> Chemical compound

2-Hydroxyestradiol (2-OHE2), also known as estra-1,3,5(10)-triene-2,3,17β-triol, is an endogenous steroid, catechol estrogen, and metabolite of estradiol, as well as a positional isomer of estriol.

<span class="mw-page-title-main">Catechol estrogen</span>

A catechol estrogen is a steroidal estrogen that contains catechol (1,2-dihydroxybenzene) within its structure. The catechol estrogens are endogenous metabolites of estradiol and estrone and include the following compounds:

<span class="mw-page-title-main">Estriol glucuronide</span> Chemical compound

Estriol glucuronide (E3G), or oestriol glucuronide, also known as estriol monoglucuronide, as well as estriol 16α-β-D-glucosiduronic acid, is a natural, steroidal estrogen and the glucuronic acid conjugate of estriol. It occurs in high concentrations in the urine of pregnant women as a reversibly formed metabolite of estriol. Estriol glucuronide is a prodrug of estriol, and was the major component of Progynon and Emmenin, estrogenic products manufactured from the urine of pregnant women that were introduced in the 1920s and 1930s and were the first orally active estrogens. Emmenin was succeeded by Premarin, which is sourced from the urine of pregnant mares and was introduced in 1941. Premarin replaced Emmenin due to the fact that it was easier and less expensive to produce.

<span class="mw-page-title-main">7α-Hydroxy-DHEA</span> Chemical compound

7α-Hydroxydehydroepiandrosterone, also known as 3β,7α-dihydroxyandrost-5-ene-17-one, is an endogenous, naturally occurring steroid and a major metabolite of dehydroepiandrosterone (DHEA) that is formed by CYP7B1 in tissues such as the prostate gland and by CYP3A4 in the liver. The major metabolic pathway of DHEA outside the liver is via 7-hydroxylation into 7α-OH-DHEA and 7β-OH-DHEA. 7α-OH-DHEA has weak estrogenic activity, selectively activating the estrogen receptor ERβ. In addition, 7α-OH-DHEA may be responsible for the known antiglucocorticoid effects of DHEA.

<span class="mw-page-title-main">Estradiol glucuronide</span> Chemical compound

Estradiol glucuronide, or estradiol 17β-D-glucuronide, is a conjugated metabolite of estradiol. It is formed from estradiol in the liver by UDP-glucuronyltransferase via attachment of glucuronic acid and is eventually excreted in the urine by the kidneys. It has much higher water solubility than does estradiol. Glucuronides are the most abundant estrogen conjugates.

<span class="mw-page-title-main">Estrone glucuronide</span> Chemical compound

Estrone glucuronide, or estrone-3-D-glucuronide, is a conjugated metabolite of estrone. It is formed from estrone in the liver by UDP-glucuronyltransferase via attachment of glucuronic acid and is eventually excreted in the urine by the kidneys. It has much higher water solubility than does estrone. Glucuronides are the most abundant estrogen conjugates and estrone glucuronide is the dominant metabolite of estradiol.

<span class="mw-page-title-main">Estriol sulfate glucuronide</span> Chemical compound

Estriol sulfate glucuronide, or estriol 3-sulfate 16α-glucuronide, is an endogenous, naturally occurring diconjugated metabolite of estriol. It is generated in the liver from estriol sulfate by UDP-glucuronyltransferase and is eventually excreted in the urine by the kidneys. It occurs in high concentrations during pregnancy along with estriol sulfate and estriol glucuronide, and was a component of the early pharmaceutical estrogens Progynon and Emmenin.

<span class="mw-page-title-main">2-Hydroxyestrone</span> Chemical compound

2-Hydroxyestrone (2-OHE1), also known as estra-1,3,5(10)-trien-2,3-diol-17-one, is an endogenous, naturally occurring catechol estrogen and a major metabolite of estrone and estradiol. It is formed irreversibly from estrone in the liver and to a lesser extent in other tissues via 2-hydroxylation mediated by cytochrome P450 enzymes, mainly the CYP3A and CYP1A subfamilies. 2-OHE1 is the most abundant catechol estrogen in the body.

<span class="mw-page-title-main">4-Hydroxyestradiol</span> Chemical compound

4-Hydroxyestradiol (4-OHE2), also known as estra-1,3,5(10)-triene-3,4,17β-triol, is an endogenous, naturally occurring catechol estrogen and a minor metabolite of estradiol. It is estrogenic, similarly to many other hydroxylated estrogen metabolites such as 2-hydroxyestradiol, 16α-hydroxyestrone, estriol (16α-hydroxyestradiol), and 4-hydroxyestrone but unlike 2-hydroxyestrone.

<span class="mw-page-title-main">4-Hydroxyestrone</span> Chemical compound

4-Hydroxyestrone (4-OHE1), also known as estra-1,3,5(10)-triene-3,4-diol-17-one, is an endogenous, naturally occurring catechol estrogen and a minor metabolite of estrone and estradiol. It is estrogenic, similarly to many other hydroxylated estrogen metabolites such as 2-hydroxyestradiol, 16α-hydroxyestrone, estriol (16α-hydroxyestradiol), and 4-hydroxyestradiol but unlike 2-hydroxyestrone.

<span class="mw-page-title-main">2-Methoxyestrone</span> Chemical compound

2-Methoxyestrone (2-ME1) is an endogenous, naturally occurring methoxylated catechol estrogen and metabolite of estrone that is formed by catechol O-methyltransferase via the intermediate 2-hydroxyestrone. Unlike estrone but similarly to 2-hydroxyestrone and 2-methoxyestradiol, 2-methoxyestrone has very low affinity for the estrogen receptor and lacks significant estrogenic activity.

<span class="mw-page-title-main">4-Methoxyestrone</span> Chemical compound

4-Methoxyestrone (4-ME1) is an endogenous, naturally occurring methoxylated catechol estrogen and metabolite of estrone that is formed by catechol O-methyltransferase via the intermediate 4-hydroxyestrone. It has estrogenic activity similarly to estrone and 4-hydroxyestrone.

<span class="mw-page-title-main">Hydroxylation of estradiol</span>

The hydroxylation of estradiol is one of the major routes of metabolism of the estrogen steroid hormone estradiol. It is hydroxylated into the catechol estrogens 2-hydroxyestradiol and 4-hydroxyestradiol and into estriol (16α-hydroxyestradiol), reactions which are catalyzed by cytochrome P450 enzymes predominantly in the liver, but also in various other tissues.

<span class="mw-page-title-main">Estriol 3-glucuronide</span> Chemical compound

Estriol 3-glucuronide, or oestriol 3-glucuronide, also known as estriol 3-β-D-glucosiduronic acid, is a natural, steroidal estrogen and a glucuronic acid conjugate of estriol. It is found in the urine of women as a reversibly formed metabolite of estriol. The positional isomer of estriol 3-glucuronide, estriol 16α-glucuronide, also occurs as an endogenous metabolite of estriol, but to a much greater extent in comparison.

<span class="mw-page-title-main">Etiocholanedione</span> Chemical compound

Etiocholanedione, also known as 5β-androstanedione or as etiocholane-3,17-dione, is a naturally occurring etiocholane (5β-androstane) steroid and an endogenous metabolite of androgens like testosterone, dihydrotestosterone, dehydroepiandrosterone (DHEA), and androstenedione. It is the C5 epimer of androstanedione (5α-androstanedione). Although devoid of androgenic activity like other 5β-reduced steroids, etiocholanedione has some biological activity of its own. The compound has been found to possess potent haematopoietic effects in a variety of models. In addition, it has been found to promote weight loss in animals and in a double-blind, placebo-controlled clinical study in humans conducted in 1993. These effects are said to be similar to those of DHEA. Unlike DHEA however, etiocholanedione cannot be metabolized further into steroid hormones like androgens and estrogens.

<span class="mw-page-title-main">Estradiol 3-glucuronide</span> Chemical compound

Estradiol 3-glucuronide (E2-3G), also known as 17β-estradiol 3-(β-D-glucuronide), is a naturally occurring and endogenous estrogen conjugate. It is specifically the C3 glucuronide conjugate of estradiol, the major estrogen in the body. It is formed from estradiol in the liver by UDP-glucuronosyltransferase via attachment of glucuronic acid and is eventually excreted in urine and bile. Similarly to estrogen sulfates like estrone sulfate, estrogen glucuronides have much higher water solubility than do unconjugated estrogens like estradiol.

<span class="mw-page-title-main">16-Ketoestradiol</span> Chemical compound

16-Ketoestradiol is an endogenous estrogen related to 16-ketoestrone. 16-Ketoestrone is a very weak estrogen with only 1/1000 the estrogenic potency of estradiol in the uterus. It is a so-called "short-acting" or "impeded" estrogen, similarly to estriol and dimethylstilbestrol.

<span class="mw-page-title-main">2-Methoxyestriol</span> Chemical compound

2-Methoxyestriol (2-MeO-E3) is an endogenous estrogen metabolite. It is specifically a metabolite of estriol and 2-hydroxyestriol. It has negligible affinity for the estrogen receptors and no estrogenic activity. However, 2-methoxyestriol does have some non-estrogen receptor-mediated cholesterol-lowering effects.

<span class="mw-page-title-main">4-Methoxyestriol</span> Chemical compound

4-Methoxyestriol (4-MeO-E3) is an endogenous estrogen metabolite. It is the 4-methyl ether of 4-hydroxyestriol and a metabolite of estriol and 4-hydroxyestriol. 4-Methoxyestriol has very low affinities for the estrogen receptors. Its relative binding affinities (RBAs) for estrogen receptor alpha (ERα) and estrogen receptor beta (ERβ) are both about 1% of those of estradiol. For comparison, estriol had RBAs of 11% and 35%, respectively.

References

  1. ↑ "Human Metabolome Database: Showing metabocard for 4-Methoxy-17beta-estradiol (HMDB0012782)".
  2. ↑ Anna R. Hemnes (16 December 2015). Gender, Sex Hormones and Respiratory Disease: A Comprehensive Guide. Humana Press. pp. 32–. ISBN   978-3-319-23998-9.
  3. ↑ Christian Lauritzen; John W. W. Studd (22 June 2005). Current Management of the Menopause. CRC Press. pp. 378–379. ISBN   978-0-203-48612-2.
  4. ↑ Bhavnani BR, Nisker JA, Martin J, Aletebi F, Watson L, Milne JK (2000). "Comparison of pharmacokinetics of a conjugated equine estrogen preparation (premarin) and a synthetic mixture of estrogens (C.E.S.) in postmenopausal women". J. Soc. Gynecol. Investig. 7 (3): 175–83. doi:10.1016/s1071-5576(00)00049-6. PMID   10865186.



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