Stereochemistry | ABSOLUTE |
Molecular Formula | C26H30O9.2Na |
Molecular Weight | 532.4905 |
Optical Activity | UNSPECIFIED |
Defined Stereocenters | 6 / 6 |
E/Z Centers | 0 |
Charge | 0 |
SHOW SMILES / InChI
SMILES
[Na+].[Na+].[H][C@@]12C[C@@H](OC(=O)CCC([O-])=O)[C@H](OC(=O)CCC([O-])=O)[C@@]1(C)CC[C@]3([H])C4=C(CC[C@@]23[H])C=C(O)C=C4
InChI
InChIKey=WHMFJWUAHROXHB-KQAQVGESSA-L
InChI=1S/C26H32O9.2Na/c1-26-11-10-17-16-5-3-15(27)12-14(16)2-4-18(17)19(26)13-20(34-23(32)8-6-21(28)29)25(26)35-24(33)9-7-22(30)31;;/h3,5,12,17-20,25,27H,2,4,6-11,13H2,1H3,(H,28,29)(H,30,31);;/q;2*+1/p-2/t17-,18-,19+,20-,25+,26+;;/m1../s1
Estriol (E3), also spelled oestriol, is a steroid, a weak agonist of the estrogen receptors ERα and ERβ., and a minor female sex hormone. According to in vitro study, the relative binding affinity (RBA) of estriol for the human ERα and ERβ was 11.3% and 17.6% of that estradiol, respectively, and the relative transactivational capacity of estrone at the ERα and ERβ was 10.6% and 16.6% of that of estradiol, respectively. Estriol is marketed widely in Europe and elsewhere throughout the world under the brand names Ovestin, Ortho-Gynest, and a variety of others. It is available in oral tablet, vaginal cream, and vaginal suppository form, and is used in menopausal hormone therapy for the treatment of menopausal symptoms. Estriol is also available in some countries as estriol succinate (brand name Synapause), a dosage-equivalent ester prodrug of estriol. Estriol and estriol succinate are not approved for use in the United States and Canada, although they have been produced and sold by compounding pharmacies in North America for use as a component of bioidentical hormone therapy. Estriol can be measured in maternal blood or urine and can be used as a marker of fetal health and well-being. If levels of unconjugated estriol (uE3 or free estriol) are abnormally low in a pregnant woman, this may indicate chromosomal or congenital anomalies like Down syndrome or Edward's syndrome. It is included as part of the triple test and quadruple test for antenatal screening for fetal anomalies.
CNS Activity
Originator
Approval Year
PubMed
Sample Use Guides
1 g/daily of the vaginal gel containing 50 μg of estriol (0.005%) for 3 weeks and then twice weekly for 9 weeks, for a complete cycle of treatment of 12 weeks
Route of Administration:
Vaginal
TNBC cell lines HCC1806, HCC70 and MDA-MB-231 were used for activity evaluation. For stimulation of TNBC cells to analyze signal transduction of GPR30, 4×106 cells were plated in culture medium into 25 cm2 -culture flasks. After attachment, cells were serum starved for 24 hours to synchronize the 17β- estradiol-starved cells in G0-phase. Serum starved cells were treated for 30 minutes either with 10^−4 M estriol or solvent (0.1% ethanol) and subsequently stimulated with 10^−8 M 17β-estradiol in 0.1% ethanol for 10 min or 20 minutes. Cells were harvested and cell pellets lysed in 100 μl Cell lytic M (Sigma, Deisendorf, Germany), supplemented with protease-inhibitor (Sigma, Deisendorf, Germany) and phosphatase-inhibitor (Sigma, Deisendorf, Germany).