4-Hydroxyretinoic acid (4-HRA) is a derivative of Retinoic acid (HY-14649). 4-Hydroxyretinoic acid is formed via the catalysis of retinol by cytochrome P-450 isoenzymes. 4-Hydroxyretinoic acid also serves as a substrate for UDP-glucuronosyltransferase (s) and recombinant UGT2B7. 4-Hydroxyretinoic acid binds to the nuclear receptor RAR (Retinoic Acid Receptor), activates RAR and RXR-alpha, subsequently regulates gene expression and cell differentiation, and induces cancer cell apoptosis (Apoptosis). 4-Hydroxyretinoic acid also participates in multiple physiological processes such as immunoregulation, neuroprotection and antioxidation[1][2].
