VLX1570 is an inhibitor of the 19S proteasome-specific deubiquitylating enzymes (DUBs) USP14 and UCHL5, with apoptosis-inducing and antineoplastic activities. Upon administration, VLX1570 specifically binds to both USP14 and UCHL5, thereby blocking their deubiquitylating activity. This blocks the ubiquitin proteasome degradation pathway, prevents the degradation of defective proteins, and leads to an accumulation of poly-ubiquitylated proteins. This induces the unfolded protein response (UPR) and results in both the induction of tumor cell apoptosis and the inhibition of tumor cell growth.
CAS Number: 1431280-51-1
Molecular Weight: 469.39
Chemical Name: 1-acryloyl-3,5-bis((Z)-4-fluoro-3-nitrobenzylidene)azepan-4-one
Appearance: Solid Power.
Purity: ≥98% (or refer to the Certificate of Analysis)
Solubility: Soluble in DMSO, not in water
Shipping Condition: Shipped under ambient temperature as non-hazardous chemical or refer to Certificate of Analysis
Storage Condition: Dry, dark and -20 oC for 1 year or refer to the Certificate of Analysis.
Shelf Life: ≥12 months if stored properly.
Stock Solution Storage: 0 - 4 oC for 1 month or refer to the Certificate of Analysis.
Drug Formulation: To be determined.
HS Tariff Code: 382200
How to use
VLX1570 inhibits USP14 and UCHL5 activity of 19S regulatory particles, and the inhibition of USP14 is more pronounced. VLX1570 (1 μM) shows inhibitory activity against USP14 in KMS-11 myeloma cells. VLX1570 exhibits an IC50 of 0.58 μM on HCT116 cells. VLX1570 binds to recombinant USP14 with Kd of 1.5-18 μM using two different sources of recombinant protein, and the Kd for recombinant UCHL5 is higher (14-18 μM) compared to that of USP14. VLX1570 has potent antiproliferative activities on multiple myeloma cells, with IC50s of 43 ± 2 nM, 74 ± 2 nM, 126 ± 3 nM, and 191 ± 1 nM for KMS-11, RPMI8226, OPM-2, and OPM-2-BZR cells, respectively. VLX1570 suppresses the viability of BCWM.1 cells, with an EC50 of 20.22 nM. VLX1570 (100, 250, 500 nM) induces significant apoptosis by 12 h in a dose-dependent manner in all Waldenstrom macroglobulinemia (WM) cell lines tested, including BCWM.1/IR (IR) and BCWM.1/BR (BR) subclones. VLX1570 (100, 250, 500 nM) also causes ER stress machinery and mitochondrial damage in WM cells. VLX1570 (250 nM) downregulates BCR-signalosome components and their end effectors, as well as CXCR4 expression in WM cells.
suppresses tumor growth, without obvious weight loss and other signs of systemic toxicity in the Waldenstrom macroglobulinemia (WM)-bearing mice.
- Wang X, Mazurkiewicz M, Hillert EK, Olofsson MH, Pierrou S, Hillertz P, Gullbo J, Selvaraju K, Paulus A, Akhtar S, Bossler F, Khan AC, Linder S, D'Arcy P. Corrigendum: The proteasome deubiquitinase inhibitor VLX1570 shows selectivity for ubiquitin-specific protease-14 and induces apoptosis of multiple myeloma cells. Sci Rep. 2016 Jul 29;6:30667. doi: 10.1038/srep30667. PubMed PMID: 27472448; PubMed Central PMCID: PMC4966493.
- Paulus A, Akhtar S, Caulfield TR, Samuel K, Yousaf H, Bashir Y, Paulus SM, Tran D, Hudec R, Cogen D, Jiang J, Edenfield B, Novak A, Ansell SM, Witzig T, Martin P, Coleman M, Roy V, Ailawadhi S, Chitta K, Linder S, Chanan-Khan A. Coinhibition of the deubiquitinating enzymes, USP14 and UCHL5, with VLX1570 is lethal to ibrutinib- or bortezomib-resistant Waldenstrom macroglobulinemia tumor cells. Blood Cancer J. 2016 Nov 4;6(11):e492. doi: 10.1038/bcj.2016.93. PubMed PMID: 27813535; PubMed Central PMCID: PMC5148058.
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