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ASP9521 is an inhibitor of 17β-hydroxysteroid dehydrogenase type 5/aldo-keto reductase 1C3 (17β-HSD5/AKR1C3; IC50 = 120 nM).1 It is selective for 17β-HSD5/AKR1C3 over AKR1C2 (IC50 = 20 μM). ASP9521 inhibits conversion of androstenedione into testosterone by 17β-HSD5/AKR1C3 (IC50s = 11 and 49 nM for human and cynomolgus monkey enzymes, respectively). It inhibits androstenedione-dependent production of prostate specific androgen (PSA) in and proliferation of LNCaP cells expressing 17β-HSD5/AKR1C3. ASP9521 (3 and 10 mg/kg) inhibits androstenedione-induced intratumor testosterone production in a CWR22R prostate cancer mouse xenograft model.
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1. In vitro and in vivo characterisation of ASP9521: a novel, selective, orally bioavailable inhibitor of 17β-