Liarozole (R 75251, R75,251) is an orally active benzimidazole-based retinoic acid (RA) metabolism blocking agent (RAMBA) that targets multiple P450 enzymes, including aromatase (CYP19), 17-hydroxylase/17,20-lyase (CYP17A1), 11-hydroxylase (CYP11B1), and RA 4-hydroxylase (CYP26). Liarozole is more effective than ketoconazole in vivo (plasma RA enhancement = 2.5 ng/mL vs. 1.3 ng/mL 2 hr after respective oral dosage of 40 mg/kg in rats) and, in contrast to ketoconazole, Liarozole does not significantly affect circulating adrenal androgen levels. Liarozole is shown to effectively suppress androgen-dependent tumor expansion of R3327G Dunning prostate adenocarcinoma xenografts in rats (by 66% and 81% with 80 and 120 mg/kg/day p.o., respectively) independent of its androgen biosynthesis inhibition.
| Molecular Weight | 381.69 |
| Formula | C17H13ClN4 · 2HCl |
| CAS Number | 1883548-96-6 |
| Solubility (25°C) | Water: 2 mg/mL |
| Storage |
Powder -20°C 3 years ; 4°C 2 years In solvent -80°C 6 months ; -20°C 1 month |
| Species | Mouse | Rat | Rabbit | Guinea pig | Hamster | Dog |
| Weight (kg) | 0.02 | 0.15 | 1.8 | 0.4 | 0.08 | 10 |
| Body Surface Area (m2) | 0.007 | 0.025 | 0.15 | 0.05 | 0.02 | 0.5 |
| Km factor | 3 | 6 | 12 | 8 | 5 | 20 |
| Animal A (mg/kg) = Animal B (mg/kg) multiplied by | Animal B Km |
| Animal A Km |
For example, to modify the dose of Compound A used for a mouse (20 mg/kg) to a dose based on the BSA for a rat, multiply 20 mg/kg by the Km factor for a mouse and then divide by the Km factor for a rat. This calculation results in a rat equivalent dose for Compound A of 10 mg/kg.
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