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Discovery of a highly potent and orally available importin- β 1 inhibitor that overcomes enzalutamide-resistance in advanced prostate cancer.
Acta Pharmaceutica Sinica. B 2023 December
Nuclear transporter importin- β 1 is emerging as an attractive target by virtue of its prevalence in many cancers. However, the lack of druggable inhibitors restricts its therapeutic proof of concept. In the present work, we optimized a natural importin- β 1 inhibitor DD1 to afford an improved analog DD1 -Br with better tolerability (>25 folds) and oral bioavailability. DD1 -Br inhibited the survival of castration-resistant prostate cancer (CRPC) cells with sub-nanomolar potency and completely prevented tumor growth in resistant CRPC models both in monotherapy (0.5 mg/kg) and in enzalutamide-combination therapy. Mechanistic study revealed that by targeting importin- β 1, DD1 -Br markedly inhibited the nuclear accumulation of multiple CRPC drivers, particularly AR-V7, a main contributor to enzalutamide resistance, leading to the integral suppression of downstream oncogenic signaling. This study provides a promising lead for CRPC and demonstrates the potential of overcoming drug resistance in advanced CRPC via targeting importin- β 1.
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