Talarozole
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Talarozole (formerly R115866, planned trade name Rambazole) was an investigational drug for the treatment of acne, psoriasis and other keratinization disorders. Development for that purpose has been discontinued.[1] However, its effect in increasing retinoic acid is now being investigated in hand and knee osteoarthritis.[2]
Talarozole inhibits the metabolism of retinoic acid by blocking cytochrome P450 enzyme CYP26 isoenzymes (CYP26A1 and possibly also CYP26B1), retinoic acid hydroxylases.[3] Because of this mechanism, it is called a retinoic acid metabolism blocking agent (RAMBA).[3][4]
It has 750-fold higher potency than the earlier drug liarozole as well as greater selectivity, with more than 300-fold selectivity for inhibition of CYP26A1 over other steroid-metabolizing enzymes like CYP17A1 (17α-hydroxylase/17,20-lyase) and aromatase (CYP19A1).[3][5]
References
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