G protein-coupled estrogen receptor 1 and Estrogen receptor beta (GPER1/ERβ)

G protein-coupled estrogen receptor 1 (GPER1) and Estrogen receptor beta (ERβ) are two distinct proteins that mediate the physiological and pathological effects of estrogenic compounds. GPER1 is a member of the G protein-coupled receptor (GPCR) family that resides in the plasma membrane and endoplasmic reticulum, facilitating rapid, non-genomic signaling such as the activation of MAP kinase and PI3K pathways (Source: UniProt Q99527; PubMed: 15761152). In contrast, ERβ is a nuclear receptor that functions as a ligand-activated transcription factor, directly binding to DNA to regulate the expression of genes involved in cell cycle control and apoptosis (Source: UniProt Q92731; PubMed: 8806771). While they are structurally unrelated, they often work in concert or opposition to regulate cellular homeostasis in the cardiovascular, central nervous, and reproductive systems. ERβ is generally considered to have tumor-suppressive properties in breast and prostate tissues, whereas GPER1 has been implicated in both the progression of certain cancers and the protection of the cardiovascular system (Source: PubMed: 29149198). Drug development targeting these receptors focuses on achieving selectivity to avoid the feminizing and proliferative side effects associated with Estrogen receptor alpha (ERα).

Other names

GPR30CEPRLERGUESR2ESRBESTRBNR3A2

GPER1 ligands modulate rapid G protein-mediated signaling cascades including cAMP and MAPK, while ERβ ligands function as selective estrogen receptor modulators to regulate gene transcription.