Inobrodib

• CAT Number: I019386
• CAS Number: 2222941-37-7
• Molecular Formula: C30H32F2N4O3
• Molecular Weight: 534.60
• Purity: ≥95%
• Synonyms: (6S)-1-(3,4-difluorophenyl)-6-[5-(3,5-dimethyl-1,2-oxazol-4-yl)-1-(4-methoxycyclohexyl)benzimidazol-2-yl]piperidin-2-one
• InChI: InChI=1S/C30H32F2N4O3/c1-17-29(18(2)39-34-17)19-7-14-26-25(15-19)33-30(36(26)20-8-11-22(38-3)12-9-20)27-5-4-6-28(37)35(27)21-10-13-23(31)24(32)16-21/h7,10,13-16,20,22,27H,4-6,8-9,11-12H2,1-3H3/t20?,22?,27-/m0/s1
• InChIKey: SKDNDJWEBPQKCS-RIQBOWGZSA-N
• SMILES: CC1=C(C(=NO1)C)C2=CC3=C(C=C2)N(C(=N3)C4CCCC(=O)N4C5=CC(=C(C=C5)F)F)C6CCC(CC6)OC

Inobrodib (CCS1477) is an orally active, potent, and selective inhibitor of the p300/CBP bromodomain. Inobrodib binds to p300 and CBP with Kd values of 1.3 and 1.7 nM, respectively, and with 170/130-fold selectivity compared with BRD4 with a Kd of 222 nM. CCS1477 inhibits cell proliferation in prostate cancer cell lines and decreases androgen receptor (AR)- and C-MYC-regulated gene expression[1].
Inobrodib binding to cellular histones in an in-cell BRET assay gives an IC50 of 19 nM for p300 and 1060 nM for BRD4. Inobrodib shows potent growth-inhibitory activity in VCaP, 22Rv1, and LNCaP95 (all IC50 < 100 nM) that express both AR-FL and AR-V7[1].? Inobrodib (0-3000 nM; 48 hours) reduces expression of AR-regulated genes (KLK2, KLK3, and TMPRSS2) in both 22Rv1 and LNCaP95 cells. Inobrodib also reduces C-MYC protein expression in both 22Rv1 and LNCaP95 cells and AR-V7 protein expression in 22Rv1 cells, without clear impact on AR-FL protein expression in 22Rv1 and LNCaP95 cells. Inobrodib reduces C-MYC mRNA and downstream AR and C-MYC signaling in 22Rv1 and C4-2 cells at 16 hours. Inobrodib regulates AR signaling by affecting the recruitment of CBP, p300, and AR-FL to known AR binding sites, and has the potential to abrogate persistent AR signaling in CRPC[1].
Inobrodib (10-30 mg/kg; oral gavage; 10 or 20 mg/kg daily (QD) or 30 mg/kg every other day (QOD) for 28 days) suppresses growth of a 22Rv1 mouse xenograft model with associated reduction in AR signaling[1].?
Inobrodib (20 mg/kg; oral gavage; daily for 8 days) decreases AR and AR-V7 signaling and inhibits growth in a patient- derived model of lethal prostate cancer (NOD/SCID gamma (NSG) male castrated mice)[1].

Reference

[1]. Rasool RU, et al. Toppling the HAT to Treat Lethal Prostate Cancer. Cancer Discov. 2021;11(5):1011-1013.
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