A-485

A p300/CBP inhibitor

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1mg

￥937.00

750.00

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5mg

￥2800.00

2240.00

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10mg

￥4200.00

3360.00

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50mg

￥8312.00

6650.00

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Background

A-485 is an inhibitor of the histone acetyltransferase p300/CBP (IC₅₀ = 60 nM).¹ It decreases acetylated histone H3 lysine 27 (H3K27Ac), but not H3K9Ac, levels in PC3 cells in a concentration-dependent manner. A-485 reduces proliferation of non-small cell lung cancer (NSCLC), small cell lung cancer, triple-negative breast cancer, mantel cell lymphoma, multiple myeloma, non-Hodgkin's, and acute myeloid leukemia cell lines. It inhibits expression of prostate specific antigen (PSA) and H3K27Ac occupancy at the PSA enhancer without inhibiting androgen receptor occupancy in LNCaP-FGC cells. A-485 reduces tumor volume in a LuCaP-77 mouse xenograft model of castration-resistant prostate cancer when administered at a dose of 100 mg twice per day for 21 days.

1.Lasko, L.M., Jakob, C.G., Edalgi, R.P., et al.Discovery of a selective catalytic p300/CBP inhibitor that targets lineage-specific tumoursNature550(7674)128-132(2017)

Protocol

Cell experiment:

Cell lines are plated in 96 well or 384 well plates and allowed to adhere for 24 h. The cells are then treated with A-485 for 3, 4, or 5 days. Experiments are run in triplicate and the fraction of viable cells is determined using the Cell Viability Assay according to the manufacturer’s recommendations. For Thymidine incorporation assays, cells are treated with A-485 for 1, 2, 3, or 4 days. Twenty four hours prior to the time point, tritiated thymidine is added and cells are incubated for an additional 24 h. Genomic DNA is then isolated on filter plates[1].

Animal experiment:

The LuCap-77 CR prostate PDX model is used in this study. Donor tumors are dissociated and injected as a brie (1:2) into the right flank of 16 week old male C.B.-17 SCID mice on day 0 in a volume of 0.2 mL. Tumors are size matched on day 26 post-inoculation with a mean tumor volume of 211±3 (SEM) mm3 with dosing beginning on day 28. Mice are randomized into treatment groups using Studylog software based on tumor volume. LuCap-77 CR xenograft tumors are established in SCID mice and animals are dosed with A-485 as for 7 days. Three hours post the final dose, tumors are harvested and snap frozen on dry ice[1].

参考文献:

[1]. Lasko LM, et al. Discovery of a selective catalytic p300/CBP inhibitor that targets lineage-specific tumours. Nature. 2017 Oct 5;550(7674):128-132.