erα

Alpha-Estradiol (Epiestradiol) is an estrogen that inhibits 5alpha-reductase and has potential in the study of androgenetic alopecia.

(±)-Equol ((R,S)-Equol) is a non-steroidal estrogen produced from the metabolism of the isoflavonoid phytoestrogen daidzen by human intestinal microflora. The estrogen receptor (ER) agonist activity of the naturally occurring (S)-enantiomer (EC50 = 85 and 65 nM for human ERα and ERβ, respectively) is similar to that of genistein but exceeds that of daidzein. (±)-Equol preferentially binds ERβ (Ki = 0.73 nM) and demonstrates approximately 9-fold lower affinity for ERα (Ki = 6.41 nM). (±)-Equol is also a potent antagonist of dihydrotestosterone, which has important implications for prostate cancer and other androgen-mediated pathologies.

Estradiol (E2) is a naturally occurring steroidal sex hormone that is essential for female fertility and maintenance of secondary sexual characteristics. Estradiol upregulates IL-6 expression through estrogen receptor beta (ERβ).

Ethisterone (17α-Ethynyltestosterone) is a progestogen hormone.

Progesterone (Pregn-4-ene-3,20-dione) is the major progestational steroid that is secreted primarily by the CORPUS LUTEUM and the PLACENTA. Progesterone acts on the UTERUS, the MAMMARY GLANDS and the BRAIN. It is required in EMBRYO IMPLANTATION; PREGNANCY maintenance, and the development of mammary tissue for MILK production.

Kaempferol (Robigenin) is a natural flavonoid and an inverse agonist of ERRα and ERRγ. Kaempferol has a wide range of antitumor, anti-inflammatory, antioxidant, antibacterial and antiviral activities.

Ethynyl estradiol is a semisynthetic alkylated ESTRADIOL with a 17-alpha-ethinyl substitution. It has high estrogenic potency when administered orally, and is often used as the estrogenic component in ORAL CONTRACEPTIVES.

Dehydrodiconiferyl alcohol (DHCA) is a lignan isolated from calabash that inhibits osteoclast differentiation and oophorectomy induced bone loss by acting as an estrogen receptor agonist.

α-Vitamin E (Dexrabeprazole Sodium) is a naturally-occurring form of vitamin E, a fat-soluble vitamin with potent antioxidant properties.

2-Hydroxyanthraquinone is an anthraquinone that has been found inSpermacoce latifoliaand has antibacterial and estrogenic activities.1,2It is active againstB. subtilisandB. cereus(MICs = 1.9 and 62.5 μg ml, respectively).12-Hydroxyanthraquinone (19 μM) induces estrogen receptor α (ERα) activation in a yeast two-hybrid assay.2 1.Luo, Y., Shen, H.-Y., Shen, Q.-X., et al.A new anthraquinone and a new naphthoquinone from the whole plant of Spermacoce latifoliJ. Asian Nat. Prod. Res.19(9)869-876(2017) 2.Kurihara, R., Shiraishi, F., Tanaka, N., et al.Presence and estrogenicity of anthracene derivatives in coastal Japanese watersEnviron. Toxicol. Chem.24(8)1984-1993(2005)

Hinokitiol (4-Isopropyltropolone) can inhibit ultraviolet B-induced apoptosis in keratinocytes and strongly suggest that the inhibitory mechanism is due to the antioxidant activity of metallothionein induced by the agent. Also, Hinokitiol modulates estrogen receptor signaling and inhibits proliferation of human breast cancer cells.

Bavachin (Corylifolin) is a phytoestrogen that activates the estrogen receptors ERα and ERβ.

Psoralidin inhibits Akt phosphorylation and phosphatidylinositol 3-kinase activation and transcriptionally. Psoralidin possesses anticancer and chemopreventive properties.

1. Furanodienone has effects on MCF-7 cells are mediated, at least in part, by inhibiting ERα signaling. 2. Furanodienone inhibits EGFR HER2 signaling pathway in BT474 and SKBR3 cells, the effect is specifically dependent on the expression of HER2 but not EGFR .

1. Isocurcumenol inhibits 5α-reductase which converts testosterone to dihydrotestosterone (DHT).

Lindleyin is a novel phytoestrogen and might trigger many of the biological responses evoked by the physiological estrogens.

Tschimganidin is an ERα agonist with an IC50 of 1.4 μM, found in Apiaceae plants. It is a terpenoid compound with anti-obesity activity and is applicable in research related to endocrine and metabolic disorders.

Sagittatoside A (Icariin-A) is a flavonoid glycoside that can be extracted from Herba Epimedii. It induces the phosphorylation of serine 118 in the ERα, selectively activating estrogen response elements (ERE) and luciferase activity.