Oprozomib (ONX 0912)
Molecular Weight(MW): 532.61
Oprozomib (ONX 0912) is an orally bioavailable inhibitor for CT-L activity of 20S proteasome β5/LMP7 with IC50 of 36 nM/82 nM. Phase 1/2.
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Choose Selective Proteasome Inhibitors
|Description||Oprozomib (ONX 0912) is an orally bioavailable inhibitor for CT-L activity of 20S proteasome β5/LMP7 with IC50 of 36 nM/82 nM. Phase 1/2.|
The anti-MM activity of Oprozomib is associated with activation of caspase-8, caspase-9, caspase-3, and PARP, as well as inhibition of migration of MM cells and angiogenesis. 
|In vivo||Oprozomib is demonstrated an absolute bioavailability of up to 39% in rodents and dogs. It is well tolerated with repeated oral administration at doses resulting in >80% proteasome inhibition in most tissues and elicited an antitumor response in multiple human tumor xenograft and mouse syngeneic models .|
ELISA-based active site binding assay:Samples (lysed cells or tissue homogenates) are treated for 1 h at room temperature with the biotinylated active site probe PR-584 (5-15 μM). Samples are denatured by addition of SDS (0.9% final) and heating to 100 °C for 5 min. The denatured samples are transferred to a 96-well or 384-well filter plat, mixed with streptavidin-sepharose beads (2.5-5 μL packed beads/well), and incubated for 1 h at room temperature on a plate shaker. The beads are washed 5 times with 100-200 μL /well of ELISA buffer (PBS, 1% bovine serum albumin, 0.1% Tween-20) by vacuum filtration. The beads are incubated overnight at 4 °C on a plate shaker with the following antibodies recognizing the six catalytic subunits diluted into ELISA buffer: β5, β1, and β2 diluted 1:3000, LMP7 and LMP2 diluted 1:5000, and MECL-1 diluted 1:1000. The beads are washed 5 times with 100-200 μL /well of ELISA buffer and incubated with HRP-conjugated secondary antibody diluted 1:5000 in ELISA buffer and incubated 2 h at room temperature on a plate shaker. The beads are washed 5 times with 100-200 μL /well of ELISA buffer and developed for chemiluminsecence signal using the supersignal ELISA pico substrate following the manufacturer's instructions. Luminescence is measured on a plate reader and converted to ng of proteasome or μg/ml of lysate by comparison with 20S proteasome or untreated cell lysate standard curves. For proteasome inhibitor studies, active site probe binding values are expressed as the percent of binding relative to DMSO treated cells.
|In vitro||DMSO||100 mg/mL (187.75 mM)|
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* When preparing stock solutions always use the batch-specific molecular weight of the product found on the vial label and MSDS / COA (available online).
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Clinical Trial Information
|NCT Number||Recruitment||Conditions||Sponsor/Collaborators||Start Date||Phases|
|NCT02939183||Recruiting||Relapsed or Refractory Multiple Myeloma||Amgen||January 2017||Phase 1|
|NCT02227914||Withdrawn||Advanced Hepatocellular Carcinoma||Onyx Therapeutics, Inc.|Onyx Pharmaceuticals||December 2014||Phase 1|Phase 2|
|NCT02244112||Active, not recruiting||Advanced Non-Central Nervous System (CNS) Malignancies||Onyx Therapeutics, Inc.|Onyx Pharmaceuticals||August 2014||Phase 1|
|NCT02072863||Completed||Multiple Myeloma||Onyx Therapeutics, Inc.|Onyx Pharmaceuticals||January 2014||Phase 1|Phase 2|
|NCT01999335||Active, not recruiting||Multiple Myeloma||Onyx Therapeutics, Inc.|Onyx Pharmaceuticals||November 2013||Phase 1|Phase 2|
|NCT01881789||Active, not recruiting||Multiple Myeloma||Onyx Therapeutics, Inc.|Onyx Pharmaceuticals||August 2013||Phase 1|Phase 2|
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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