Estrogen receptor alpha (ERα), Estrogen receptor beta (ERβ), G protein-coupled estrogen receptor 1 (GPER1) (ERα, ERβ, GPER1)

Estrogen signaling refers to the complex set of cellular pathways activated by the binding of estrogens such as 17β-estradiol to their specific receptors. The estrogen receptors include nuclear transcription factors ERα and ERβ, encoded by the ESR1 and ESR2 genes, respectively, and the membrane-associated GPER1 (GPR30), which is a G protein-coupled receptor. Upon ligand binding, ERα and ERβ dimerize and bind to estrogen response elements (ERE) in DNA, directly regulating the transcription of estrogen-responsive genes involved in cell proliferation, differentiation, metabolism, and apoptosis[1][3][7]. GPER1 mediates rapid non-genomic effects, involving second-messenger pathways and influencing cellular signaling almost immediately upon hormone binding[3]. Aberrant estrogen signaling is implicated in a wide range of diseases, most notably hormone-responsive cancers such as breast and endometrial cancer[6].

Other names

ERα (encoded by ESR1; also called NR3A1)ERβ (encoded by ESR2; also called NR3A2)GPER1 (also called GPR30)"Estrogen receptor" (general, non-specific)Classical estrogen receptor (ERα, ERβ)Non-classical (GPER1)

Agonists: Bind to and activate ERs, mimicking estrogen's effects. Antagonists (SERMs, SERDs): Bind to ERs and inhibit or modulate estrogen-mediated gene transcription. Aromatase inhibitors: Reduce endogenous estrogen synthesis, lowering receptor activation. GPER1 modulators: Modulate non-genomic signaling pathways.