Spebrutinib (AVL-292) is an orally available and highly selective covalent inhibitor of Bruton's tyrosine kinase (Btk) that is currently undergoing Phase 1b clinical development for CLL and B-NHL. AVL-292 selectively and covalently bonds to Btk to inactivate and silence its activity. Spebrutinib (AVL-292) inhibited osteoclast function and reduced osteoclast-stimulated proliferation of MM cells. Spebrutinib (AVL-292) was well tolerated from 125-400 mg po QD and early efficacy analysis in CLL and B-NHL shows 10/11 efficacy evaluable pts with SD. The ongoing phase Ib clinical trial of AVL-292 is being conducted in patients with B-cell malignancies, including B-cell NHL, CLL, and WM.
|Source||Allergy (2017). Figure 1. AVL-292|
|Cell Lines||HMC-1 cells, and KU812 cells|
|Incubation Time||4 hours|
|Results||We found that dasatinib, ibrutinib, AVL-292, and CNX-774 counteract anti-IgE-induced expression of pBTK in BA|
|Source||Allergy (2017). Figure 5. AVL-292|
|Cell Lines||HMC-1 cells and KU812 cells|
|Incubation Time||48 h|
|Results||As determined by 3H-thymidine uptake, ibrutinib, AVL-292, and P505-15 showed no significant effects on proliferation of HMC-1.1, HMC-1.2, and KU812 cells unless high concentrations (≥1 μmol/L) were applied|
|Cell lines||naïve human B cells|
|Preparation method||Immunoblot Analysis. Cells were incubated in serum-free RPMI media for 1–1.5 hours. Isolated human B cells were incubated with CC-292 at a final concentration of 0.001, 0.01, 0.1 and 1 μM. Ramos cells were incubated with 0.1 nM–3 μM CC-292. Cells were then incubated in the presence of compound for 1 hour at 37°C. Following incubation, cells were centrifuged and resuspended in 100 μl of serum-free RPMI and BCR was stimulated with addition of 5 μg/ml α-human IgM. Samples were centrifuged, washed in phosphate-buffered saline (PBS), and lysed in 100 μl of Cell Extraction Buffer [cat. no. FNN0011; Life Technologies (Invitrogen), Carlsbad, CA] plus 1:10 (v/v) PhosSTOP Phosphatase Inhibitor (Roche, Basel, Switzerland) and 1:10 (v/v) Complete Protease Inhibitor (cat. no. 11836145001; Roche). Antibodies used for immunoblot analysis include P-PLCγ2 [cat. no. 3872; Cell Signaling Technology, Beverly, MA (CST)], PLCγ2 (3871; CST), Syk (2712; CST), P-Syk (2710; CST), Btk (cat. no. 611116; BD Biosciences, Franklin Lakes, NJ), P-Btk (cat. no. 2207-1; Epitomics, Berlingame, CA), and Tubulin (cat. no. T6199; Sigma-Aldrich, St. Louis, MO). Membranes were scanned on a Li-Cor Odyssey scanner using infrared fluorescence detection (Li-Cor Biosciences, Lincoln, NB)..|
|Concentrations||0.001, 0.01, 0.1 and 1 μM|
|Animal models||Collagen-Induced Arthritis Model|
|Solubility (25°C)||DMSO 60 mg/mL|
Powder -20°C 3 years ; 4°C 2 years
In solvent -80°C 6 months ; -20°C 1 month
|Body Surface Area (m2)||0.007||0.025||0.15||0.05||0.02||0.5|
|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.
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|BTK inhibitor 17
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