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    InvivoChem Cat #: V0694
    CAS #: 1401223-22-0Purity ≥98%

    Description: PI-1840 (PI1840; PI 1840) is a reversible/non-covalent and selective inhibitor of chymotrypsin-like (CT-L) activity of proteasome with potential anticancer activity. It inhibits chymotrypsin-like activity of proteasome with IC50 of 27 nM. PI-1840 exhibited excellent antitumor activity in nude mice of human breast tumor xenografts 

    References: J Med Chem. 2013 May 23;56(10):3783-805; J Biol Chem. 2014 Apr 25;289(17):11906-15. 

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    Molecular Weight (MW)394.47
    CAS No.1401223-22-0
    Storage-20℃ for 3 years in powder form
    -80℃ for 2 years in solvent
    Solubility (In vitro)DMSO: 78 mg/mL (197.7 mM)
    Water: <1 mg/mL
    Ethanol: 33 mg/mL (83.7 mM)
    SynonymsPI1840; PI 1840; PI-1840; 

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    In Vitro

    In vitro activity: PI-1840 potently inhibits proteasomal CT-L activity with IC50 of 0.37 μM in intact human MDA-MB-468 cancer cells, and inhibits proliferation/survival of human MDA-MB-468 cells. In intact cancer cells, PI-1840 inhibits CT-L activity, induces the accumulation of proteasome substrates p27, Bax, and IκB-α, inhibits survival pathways and viability, and induces apoptosis.

    Kinase Assay: In the high-throughput screen, fluorogenic peptides are used as substrates to assay (at 10 μM) the 50,000 compounds library from ChemBridge for inhibitory activity against the CT-L proteolytic activity of the purified rabbit 20S proteasome. To test for selectivity for CT-L over T-L and PGPH-L the corresponding fluorogenic peptides are used. Briefly, 1 nM of purified 20S rabbit proteasome is incubated with 20 μM Suc-Leu-Leu-Val-Tyr-AMC for the CT-L activity, Bz-Val-Gly-Arg-AMC for the T-L activity, and benzyloxycarbonyl Z-Leu-Leu-Glu-AMC for the PGPH-L activity for 1 h at 37 °C in 100 μL of assay buffer (50 mM Tris-HCl, pH 7.6) with or without compound. After incubation, production of hydrolyzed 7-amido-4-methyl-coumarin (AMC) groups is measured using a WALLAC Victor2 1420 Multilabel Counter with an excitation filter of 355 nm and an emission filter of 460 nm. The amount of AMC released is within the linear range. Bortezomib is used as a positive control for IC50 determinations. To determine proteasome activity in whole cell, extracts (5 μg) from cultured cell lysate is used instead of 20S rabbit proteasome, and followed the same assay mentioned above.

    Cell Assay: MDA-MB-468 cells are plated in 96-well plates in 100 μL medium and allowed to attach overnight. Cells are then incubated for 120 h with varying concentrations of inhibitors. Media is aspirated and replaced with 100 μL complete media containing 1 mg/ml MTT and incubated for three hours at 37 °C in 5% CO2 humidified incubator. Media is then aspirated and DMSO is added. Cells are incubated for 10 min at room temperature while shaking, and the absorbance is determined at 540 nm using a μQuant spectrophotometric plate reader. The IC50 values are determined using equation under CT-L, T-L, PGPH-L proteolytic activity assays.

    In VivoPI-1840 (150 mg/kg i.p.) inhibits the tumor growth in mice of MDA-MB-231 breast tumors.
    Animal modelNude mice bearing human breast cancer MDA-MB-231 xenografts
    Formulation & DosageDissolved in 30% 2-hydroxypropyl-β-cyclodextrin; 150 mg/kg; i.p. administration

    J Med Chem. 2013 May 23;56(10):3783-805; J Biol Chem. 2014 Apr 25;289(17):11906-15. 

    These protocols are for reference only. InvivoChem does not independently validate these methods.



    PI-1833 and its potent analog PI-1840 are selective inhibitors for CT-L activity in vitro. J Biol Chem. 2014 Apr 25;289(17):11906-15.


    Antitumor efficacy of PI-1840 and bortezomib against human breast cancer MDA-MB-231 xenografts in nude mice. J Biol Chem. 2014 Apr 25;289(17):11906-15.


    Selective inhibition of the proteasomal CT-L activity in whole cells, accumulation of proteasome substrate proteins, inhibition of cell survival pathways, and induction of apoptosis. J Biol Chem. 2014 Apr 25;289(17):11906-15.


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