Acalabrutinib (ACP-196)
Catalog No.S8116
Molecular Weight(MW): 465.51
Acalabrutinib(ACP-196) is a selective second-generation Bruton's tyrosine kinase (BTK) inhibitor with an IC50 of 3 nM, which prevents the activation of the B-cell antigen receptor (BCR) signaling pathway. ACP-196 has improved target specificity over ibrutinib with 323-, 94-, 19- and 9-fold selectivity over the other TEC kinase family members (ITK, TXK, BMX, and TEC, respectively) and no activity against EGFR.
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Comparison of the impairment of ADCC against primary CLL cells by different irreversible BTK inhibitors. The antibody-dependent increase in the percentages of minimal calcein retention was determined with 3-fold excess of 1708-LC3E11 effector cells over CLL target cells in seven independent experiments. (a) Asterisks above the boxes and whiskers denote the significance of enhanced cytotoxicity compared to the control without addition of antibodies and inhibitors as determined by paired t-tests. Furthermore combination treatment was compared to that with anti-CD20 antibodies as single agents. (b) The mean differences ± SEM in the cytotoxicity against CLL cells in the presence and absence of rituximab and obinutuzumab were calculated from the data shown in (a). The ADCC of rituximab and obinutuzumab was compared by paired two-tailed t-test. *p<0.05; **p<0.01; ***p<0.001.
BioMed Research International, 2018, Article ID 1023490. Acalabrutinib (ACP-196) purchased from Selleck.
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Biological Activity
| Description | Acalabrutinib(ACP-196) is a selective second-generation Bruton's tyrosine kinase (BTK) inhibitor with an IC50 of 3 nM, which prevents the activation of the B-cell antigen receptor (BCR) signaling pathway. ACP-196 has improved target specificity over ibrutinib with 323-, 94-, 19- and 9-fold selectivity over the other TEC kinase family members (ITK, TXK, BMX, and TEC, respectively) and no activity against EGFR. | ||||||||||||||||
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| Targets |
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| In vitro |
In the in vitro signaling assay on primary human CLL cells, acalabrutinib inhibits tyrosine phosphorylation of downstream targets of ERK, IKB, and AKT. Acalabrutinib demonstrates higher selectivity for BTK with IC50 determinations on nine kinases with a cysteine residue in the same position as BTK. Importantly, unlike ibrutinib, acalabrutinib does not inhibit EGFR, ITK, or TEC. acalabrutinib has no effect on EGFR phosphorylation on tyrosine residues Y1068 and Y1173. Compared with ibrutinib, acalabrutinib has much higher IC50(>1000 nM) or virtually no inhibition on kinase activities of ITK, EGFR, ERBB2, ERBB4, JAK3, BLK, FGR, FYN, HCK, LCK, LYN, SRC, and YES1[1]. |
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| Cell Data |
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| Assay |
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| In vivo | oral administration of ACP-196 in mice results in dose-dependent inhibition of anti-IgM-induced CD86 expression in CD19+ splenocytes with an ED50 of 0.34 mg/kg compared to 0.91 mg/kg for ibrutinib. A similar model is used to compare the duration of Btk inhibition after a single oral dose of 25 mg/kg. ACP-196 inhibits CD86 expression >90% at 3h postdose[3]. |
Protocol
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Solubility (25°C)
| In vitro | DMSO | 93 mg/mL (199.78 mM) |
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| Ethanol | 93 mg/mL (199.78 mM) | |
| Water | Insoluble | |
| In vivo | Add solvents to the product individually and in order(Data is from Selleck tests instead of citations): 2% DMSO+30% PEG 300+2% Tween 80+ddH2O For best results, use promptly after mixing. |
6mg/mL |
* Please note that Selleck tests the solubility of all compounds in-house, and the actual solubility may differ slightly from published values. This is normal and is due to slight batch-to-batch variations.
Chemical Information
| Molecular Weight | 465.51 |
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| Formula | C26H23N7O2 |
| CAS No. | 1420477-60-6 |
| Storage | powder |
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| Synonyms | N/A |
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Clinical Trial Information
| NCT Number | Recruitment | interventions | Conditions | Sponsor/Collaborators | Start Date | Phases |
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| NCT03863184 | Not yet recruiting | Drug: Acalabrutinib|Drug: Lenalidomide|Drug: Rituximab | Mantle Cell Lymphoma | Weill Medical College of Cornell University|AstraZeneca|Celgene Corporation | November 1 2019 | Phase 2 |
| NCT03932331 | Not yet recruiting | Drug: Acalabrutinib | Phase I: Relapsed or Refractory B-cell Malignancies|Phase II Cohort A: Relapsed or Refractory Mantle Cell Lymphoma|Phase II Cohort B: Relapsed or Refractory Chronic Lymphocytic Leukemia | AstraZeneca | August 30 2019 | Phase 1|Phase 2 |
| NCT03685708 | Recruiting | Biological: HEPLISAV-B | Hepatitis|Safety and Tolerability | National Heart Lung and Blood Institute (NHLBI)|National Institutes of Health Clinical Center (CC) | December 7 2018 | Phase 2 |
| NCT03968848 | Completed | Drug: acalabrutinib | Hepatic Impairment|Hepatic Insufficiency|Healthy Subjects | Acerta Pharma BV|AstraZeneca | November 12 2018 | Phase 1 |
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Answers to questions you may have can be found in the inhibitor handling instructions. Topics include how to prepare stock solutions, how to store inhibitors, and issues that need special attention for cell-based assays and animal experiments.
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