Cytochrome P450 enzymes involved in estradiol hydroxylation (CYP) (CYP (Estradiol hydroxylases))

Cytochrome P450 (CYP) enzymes involved in estradiol hydroxylation are a group of heme-thiolate monooxygenases that catalyze the oxidative metabolism of 17β-estradiol into various hydroxylated metabolites. The primary enzymes in this pathway include CYP1A1, CYP1A2, and CYP1B1, which facilitate hydroxylation at the C-2 and C-4 positions, and CYP3A4, which is responsible for 16α-hydroxylation (PMID: 11133376). These metabolic routes are critical in oncology because the resulting metabolites possess different biological activities; for instance, 4-hydroxyestradiol is considered genotoxic and pro-carcinogenic due to its ability to form DNA adducts, whereas 2-hydroxyestradiol is generally viewed as protective or less active (PMID: 16112652). Consequently, these enzymes—particularly CYP1B1—are targeted for inhibition to reduce the production of harmful metabolites in hormone-sensitive cancers like breast and endometrial cancer (PMID: 20655110). Beyond cancer, these enzymes are major players in the metabolism of numerous clinical drugs, making them central to the study of pharmacokinetics and the prevention of adverse drug-drug interactions (Source: UniProt P11712, P04798).

Other names

Estrogen hydroxylasesEstradiol 2-hydroxylaseEstradiol 4-hydroxylaseEstradiol 16-alpha-hydroxylaseEstrogen monooxygenases

Inhibition of the oxidative metabolism of estradiol to prevent the formation of genotoxic or proliferative metabolites.