Estradiol and Estrone Differences in Human Physiology

Physiological Effects

• Estradiol has stronger effects on the renin-angiotensin-aldosterone system (RAAS), with studies showing it increases angiotensinogen production more significantly than other estrogens 1

Metabolic Pathway

• Estriol is produced from estrone and cannot be converted back to estradiol, making it a terminal metabolite in the estrogen pathway 2

Clinical Implications

• For women using aromatase inhibitors after breast cancer, estriol-containing preparations (derived from estrone) may be preferable over estradiol-containing ones since estriol cannot be converted back to estradiol 2, 3

Cardiovascular Effects

• Estradiol has more pronounced effects on vascular function, increasing stroke volume, heart rate, and contractility while reducing peripheral vascular resistance in postmenopausal women 4