Org 33201: a new highly selective orally active aromatase inhibitor

Area of Science:

• Pharmacology
• Medicinal Chemistry

Background:

• Aromatase is a key enzyme in estrogen biosynthesis.
• Selective aromatase inhibitors are valuable therapeutic agents.

Purpose of the Study:

• To evaluate the inhibitory potential and selectivity of Org 33201 against human aromatase.
• To assess the in vivo efficacy of Org 33201.

Main Methods:

• In vitro enzyme inhibition assays using human aromatase.
• Assessment of inhibition against other cytochrome P-450 enzymes.
• In vivo studies in rats and dogs following oral administration.

Main Results:

• Org 33201 is a potent inhibitor of human aromatase (IC50 = 2.2 x 10(-9) mol/L).
• Org 33201 exhibits high selectivity, requiring >200-fold higher concentrations to inhibit other P-450 enzymes.
• Significant oral activity was observed in rats (ED50 = 0.035 mg/kg) and dogs (70% inhibition at 1 mg/kg).

Conclusions:

• Org 33201 is a potent and highly selective aromatase inhibitor.
• The compound demonstrates promising oral bioavailability and in vivo efficacy.
• Org 33201 represents a potential therapeutic agent for hormone-dependent conditions.