ARQ 531 is a potent reversible inhibitor of BTK (IC50 = 0.85 nM), exhibits potent antitumor activity in ibrutinib-resistant diffuse large B-cell lymphoma. ARQ 531 targets multiple oncogenic signaling pathways in both ABC- and GCB-DLBCL cell lines. Unlike ibrutinib, ARQ 531 suppressed both the upstream activating signals (via inhibition of a select member of Src kinase family) and the downstream signaling pathways (via pAKT and pERK kinases). In GCB-DLBCL cell lines (SUDHL-4 and DOHH-2), ARQ 531 potently suppressed expression of anti-apoptotic c-Myc and BCL6 oncoproteins in a dose dependent fashion, and concomitantly induced apoptotic cleavage of PARP protein.
In the ibrutinib-resistant SUDHL-4 mouse xenograft model, ARQ 531 potently suppressed tumor growth (>80% inhibition) compared to the control group when dosed orally at 75 mg/kg. Additionally, preliminary data suggest that ARQ 531 crosses the blood, brain-barrier.
| Molecular Weight | 478.93 |
| Formula | C25H23ClN4O4 |
| CAS Number | 2095393-15-8 |
| Solubility (25°C) | DMSO ≥ 80 mg/mL |
| Storage |
Powder -20°C 3 years ; 4°C 2 years In solvent -80°C 6 months ; -20°C 1 month |
| Species | Mouse | Rat | Rabbit | Guinea pig | Hamster | Dog |
| Weight (kg) | 0.02 | 0.15 | 1.8 | 0.4 | 0.08 | 10 |
| Body Surface Area (m2) | 0.007 | 0.025 | 0.15 | 0.05 | 0.02 | 0.5 |
| Km factor | 3 | 6 | 12 | 8 | 5 | 20 |
| Animal A (mg/kg) = Animal B (mg/kg) multiplied by | Animal B Km |
| Animal A Km |
For example, to modify the dose of Compound A used for a mouse (20 mg/kg) to a dose based on the BSA for a rat, multiply 20 mg/kg by the Km factor for a mouse and then divide by the Km factor for a rat. This calculation results in a rat equivalent dose for Compound A of 10 mg/kg.
| Related BTK Products |
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| TL-925
TL-925 is a potentially first-in-class Bruton's tyrosine kinase (BTK) inhibitor that targets mast cell-mediated ocular inflammation and hypersensitivity and can be used in studies related to dry eye. |
| JAK3/BTK-IN-6
JAK3/BTK-IN-6 is a potent BTK and JAK3 dual inhibitor, with IC50 values of 0.6 and 0.4 nM, respectively. |
| NX-2127
NX-2127 is an orally active, potent BTK inhibitor that induces degradation of mutant BTKC481S in cells, as well as inhibits the proliferation of BTKC481S mutant TMD8 cells. In addition, NX-2127 stimulates T cell activation and increases IL-2 production in primary human T cells. |
| DBt-10
DBt-10 is a potent BTK degrader. |
| BTK-IN-27
BTK-IN-27 is a BTK inhibitor (IC50: 0.2 nM). |
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