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Estrogen receptor (ER) antagonists and modulators act on ERα and ERβ, ligand-activated nuclear transcription factors. Cloning of human ERα complementary DNA in 1986 revealed homology with the v-erb-A oncogene product. A second receptor, ERβ, was cloned from rat prostate and ovary in 1996. Crystal structures from 1997 showed that agonists and the antagonist raloxifene place the ligand-binding domain in different conformations. Ligands here include Tamoxifen Citrate and its active metabolite (E/Z)-4-hydroxy Tamoxifen, both used in ER signaling studies. Fulvestrant is an ER antagonist that also promotes receptor degradation. GSK5182 instead targets estrogen-related receptor gamma (ERRγ), an orphan receptor that does not bind estrogens.
ErSO is a selective anticipatory unfolded protein response (a-UPR) activator that targets estrogen receptor alpha (ERα). It induces robust and sustained cytotoxic effects through the activation of the a-UPR pathway. This compound is valuable for research in cancer biology, particularly in studies investigating the role of ERα in tumor cell stress responses and therapeutic resistance.
ErSO-DFP is an anticipatory unfolded protein response (a-UPR) activator with enhanced selectivity for estrogen receptor alpha-positive (ERα+) cancer cells, exhibiting a broader selectivity profile compared to its predecessor, ErSO. This compound demonstrates significant antitumor activity against MCF-7 cancer models in murine studies. Additionally, ErSO-DFP is capable of crossing the blood-brain barrier, making it a valuable tool for research in cancer therapeutics and neuro-oncology applications.
Lindleyin is an estrogen receptor (ER) activator derived from Rhei rhizoma. It exhibits estrogenic activity by specifically binding to the ERα subtype, thereby mediating hormonal effects. This compound is useful for research related to hormonal signaling, women's health, and estrogen receptor-related pathways.
(±)-ErSO is the racemic mixture of ErSO, a selective activator of the anticipatory unfolded protein response (a-UPR). This compound plays a critical role in modulating cellular stress response pathways and protein homeostasis. It is widely utilized in research applications focused on understanding protein misfolding diseases and the mechanisms of cellular adaptation to stress.
Desketoraloxifene is a selective estrogen receptor alpha (ERα) activator that functions at an AP-1 site. This compound demonstrates significant biological activity in modulating estrogen signaling pathways, making it a valuable tool in research focused on osteoporosis and breast cancer. Its ability to selectively activate ERα provides insights into the therapeutic potential of estrogen-related treatments in these diseases.
GPER Activator 1 is a selective activator of the G protein-coupled estrogen receptor (GPER). This compound has been shown to exhibit dual inhibition of inflammation induced by TNFα and IL-6, making it a valuable tool for investigating the role of GPER in inflammatory responses. Its non-cytotoxic nature further supports its application in various biological research settings.
Synonyms: Hogival; Oestrone-3-acetate; Puboestrene
Estrone acetate is an estrogen derivative that acts as an estrogen receptor (ER) activator. It promotes mammary gland development, stimulates prolactin secretion from the pituitary, and induces the proliferation and activation of lactotrophs, which is evidenced by alterations in organelle morphology. This compound is valuable for endocrine research, particularly in the exploration of estrogen’s role in pituitary function, prolactin regulation, and mammary tumor models.
Synonyms: d-Medicarpin
(+)‐Medicarpin is a pterocarpan isoflavonoid that acts as an activator of the estrogen receptor (ER) β pathway. This compound inhibits osteoclastogenesis, thereby promoting bone healing and increasing bone mass through enhanced osteoblast differentiation. Its biological activities make it a valuable reagent for research applications focused on bone biology and estrogen signaling.
Phenolphthalol is an estrogen receptor (ER) activator known for its laxative properties. It demonstrates estrogenic activity and can influence various biological pathways related to estrogen signaling. This compound is primarily utilized in research applications investigating hormonal regulation, receptor activity, and relevant pharmacological studies.
