PCI 29732

PCI 29732 is a potent, orally active, reversible BTK inhibitor with K_i^app values of 8.2, 4.6, and 2.5 nM for BTK, Lck and Lyn, respectively. PCI 29732 shows only modest inhibitory activity against Itk, another Tec family kinase. PCI 29732 inhibits the function of ABCG2 by competitively binding to the ATP-binding site of ABCG2^[1][2]. In Vitro: PCI29732 shows cytotoxicity in different cells. The IC₅₀ values are 7.94 μM for S1, 7.79 μM for S1-MI-80, 6.55 μM for H460, 6.34 μM for H460/MX20, 6.14 μM for KB, 6.02 μM for KBv200, 12.45 μM for HEK293/pcDNA3, 14.58 μM for HEK293-ABCG2-482-R2, and 13.24 μM for HEK293-ABCG2-482-T7 cells^[2].
PCI-29732 blocks the transcriptional up-regulation of a panel of B-cell activation genes in human CD20+ B cells stimulated at the B-cell antigen receptor (BCR)^[3]. In Vivo: PCI 29732 inhibits the function of ABCG2 by competitively binding to the ATP-binding site of ABCG2 and enhances the anti-tumor efficacy of substrate chemotherapeutic agents^[2].
PCI 29732 (20 mg/kg; p.o.; every 3 d × 5 times) enhances the anticancer efficacy of Topotecan in the H460/MX20 cell xenograft nude mice model^[2].