b-AP15

Catalog No.S4920

b-AP15 is a deubiquitinases inhibitor for 19S proteasomes activity of Ub-AMC cleavage with IC50 of 2.1 μM.

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b-AP15 Chemical Structure

b-AP15 Chemical Structure
Molecular Weight: 419.39

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Product Description

Biological Activity

Description b-AP15 is a deubiquitinases inhibitor for 19S proteasomes activity of Ub-AMC cleavage with IC50 of 2.1 μM.
Targets USP14 [1] UCHL5 [1]
IC50 2.1 μM
In vitro b-AP15 inhibits the activity of two 19S regulatory-particle-associated deubiquitinases, ubiquitin C-terminal hydrolase 5 (UCHL5) and ubiquitin-specific peptidase 14 (USP14), resulting in accumulation of polyubiquitin. b-AP15 results in a dose-dependent accumulation of the UbG76V-YFP reporter with IC50 of 0.8 μM, indicating impaired proteasome degradation. b-AP15 (1 μM) results in rapid accumulation of polyubiquitinated proteins in human colon carcinoma HCT-116 cells. b-AP15 (2.2 μM) increases the amounts of the cyclin-dependent kinases CDKN1A and CDKNIB and the tumor suppressor TP53 in a dose-dependent manner without altering the amounts of ornithine decarboxylase 1 (ODC1) in HCT-116 cells. b-AP15 (1 μM) results in G2/M phase cell-cycle arrest in HCT-116 cells, consistent with the accumulation of cell-cycle inhibitors. b-AP15 treatment increases the number of hypodiploid cells and is associated with increased amounts of apoptotic markers, including activated caspase-3, caspase-cleaved poly-ADP ribose polymerase (PARP) and cytokeratin-18 (CK18). b-AP15 is more toxic to HCT-116 cells as compared to immortalized epithelial cells (hTERT-RPE1) or peripheral blood mononuclear cells. b-AP15 inhibits deubiquitinating activity using a variety of substrates, including Ub-AMC, Ub-GFP22, ubiquitinated p53-binding protein homolog (HDM2), and K48- and K63-linked ubiquitin tetramer chains. [1] b-AP15 is an inhibitor of the UPS that induced cell death via induction of the lysosomal apoptosis pathway in a cathepsin-D dependent manner. b-AP15 elicits characteristic UPS defects including the accumulation of ubiquitin conjugates and cell cycle inhibitors such as p21, p27 and the tumor suppressor p53. b-AP15 inhibits the deubiquitinase activity of both cysteine DUBs, with USP14 being slightly more sensitive than UCHL5. b-AP15 induces apoptosis in cells over-expressing the anti-apoptotic Bcl-2 protein and in cells lacking the p53 gene. [2] b-AP15 (1 μM) inhibits ATP-induced IL-1β release from LPS-primed peritoneal macrophages. b-AP15 (1 μM) reduces the levels of cell death induced by nigericin treatment in THP-1 cells. b-AP15 (1 μM) significantly reduces the numbers of ASC specks formed after nigericin treatment in LPS-primed THP-1 cells. [3]
In vivo b-AP15 (5 mg/kg) shows significant antitumor activity in severe combined immunodeficiency (SCID) mice with FaDu squamous carcinoma xenografts. b-AP15 (5 mg/kg) significantly delays tumor onset in mice with HCT-116 colon carcinoma xenografts. [1]
Features Not a general deubiquitinase inhibitor. Has minimal inhibition on recombinant and cytosolic nonproteasomal cysteine deubiquitinases.

Protocol(Only for Reference)

Kinase Assay:

[1]

Deubiquitinase inhibition assays For deubiquitinase inhibition assays, we incubate 19S regulatory particle (5 nM), 26S (5 nM) UCH-L1 (5 nM), UCH-L3 (0.3 nM), USP2CD (5 nM), USP7CD (5 nM), USP8CD, (5 nM) or BAP1 (5 nM) with DMSO or b-AP15 and monitored the cleavage of ubiquitin-AMC (1?03 nM) using a Wallac VICTOR Multilabel counter or a Tecan Infinite M1000 equipped with 380 nm excitation and 460 nm emission filters.

Animal Study:

[1]

Animal Models mice with HCT-116 colon carcinoma xenografts
Formulation Cremophor EL and polyethylene glycol 400 (1:1)
Dosages 5 mg/kg
Administration intraperitoneal injection

Conversion of different model animals based on BSA (Value based on data from FDA Draft Guidelines)

SpeciesMouseRatRabbitGuinea pigHamsterDog
Weight (kg)0.020.151.80.40.0810
Body Surface Area (m2)0.0070.0250.150.050.020.5
Km factor36128520
Animal A (mg/kg) = Animal B (mg/kg) multiplied by  Animal B Km
Animal A Km

For example, to modify the dose of resveratrol used for a mouse (22.4 mg/kg) to a dose based on the BSA for a rat, multiply 22.4 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 resveratrol of 11.2 mg/kg.

Rat dose (mg/kg) = mouse dose (22.4 mg/kg) ×  mouse Km(3)  = 11.2 mg/kg
rat Km(6)
1

References

[1] D

[2] D

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Chemical Information

Download b-AP15 SDF
Molecular Weight (MW) 419.39
Formula

C22H17N3O6

CAS No. 1009817-63-3
Storage 3 years -20℃powder
2 years -80℃in solvent
Synonyms NSC687852
Solubility (25°C) * In vitro DMSO 48 mg/mL warming (114.45 mM)
Water <1 mg/mL
Ethanol <1 mg/mL
In vivo 4% DMSO+corn oil 1mg/mL
* <1 mg/ml means slightly soluble or insoluble.
* 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 Name 4-Piperidinone, 3,5-bis[(4-nitrophenyl)methylene]-1-(1-oxo-2-propen-1-yl)-, (3E,5E)-

Tech Support

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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