Estradiol (specifically, 17β-estradiol) (E2)

17β-Estradiol is a naturally occurring estrogen steroid hormone and the major female sex hormone in humans, vital for the development and maintenance of female reproductive tissues and secondary sexual characteristics. It exerts its physiological effects primarily by binding to estrogen receptors (ERα and ERβ), modulating gene expression and cellular signaling processes in multiple tissues. Estradiol is also involved in rapid nongenomic signal transduction and influences cardiovascular, bone, nervous, and immune systems. In medical practice, estradiol itself is used as a drug for hormone replacement, but as a molecule, it is not a "target" for drug action; rather, it is the ligand for target proteins (the estrogen receptors). Thus, references to "targeting" estradiol generally relate to either antagonizing its effects (through receptor blockade) or inhibiting its synthesis.

Other names

Estradiol-17ββ-estradiolE2oestradiol17β-oestradiol17-beta-estradiol

Estradiol binds to and activates estrogen receptors (ERα, ERβ), which are nuclear transcription factors, leading to gene regulation and cellular responses. It also acts via rapid, nongenomic pathways involving kinase signaling cascades.