PB28 is a very potent high affinity (Ki = 5.3 nM1, 0.34 nM2) sigma 2 agonist. Selective for sigma 2 over sigma1 (approx 30-40x).1,2 PB28 inhibited cell growth in MCF7 and MCF7 ADR breast cancer cells and displayed strong synergism with doxorubicin.3 PB28
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