1. Metabolic Enzyme/Protease
  2. Cathepsin
  3. Aloxistatin

Aloxistatin (Synonyms: E64d; E64c ethyl ester)

Cat. No.: HY-100229 Purity: 98.22%
Handling Instructions

Aloxistatin (E64d) is a cell-permeable and irreversible broad-spectrum cysteine protease inhibitor.

For research use only. We do not sell to patients.

Aloxistatin Chemical Structure

Aloxistatin Chemical Structure

CAS No. : 88321-09-9

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10 mM * 1 mL in DMSO USD 99 In-stock
Estimated Time of Arrival: December 31
1 mg USD 60 In-stock
Estimated Time of Arrival: December 31
5 mg USD 132 In-stock
Estimated Time of Arrival: December 31
10 mg USD 228 In-stock
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25 mg USD 528 In-stock
Estimated Time of Arrival: December 31
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Customer Review

Based on 5 publication(s) in Google Scholar

Top Publications Citing Use of Products

    Aloxistatin purchased from MCE. Usage Cited in: Toxicol Appl Pharmacol. 2018 Oct 1;356:159-171.

    Western blot analysis of PARP and cleaved PARP levels MIA PaCa-2 and PANC-1 cells pre-treated with inhibitors of lysosomal hydrolases (Aloxistatin, 5 μM) for 1 h, followed by a 24-h treatment with Alan (20 μM).
    • Biological Activity

    • Protocol

    • Purity & Documentation

    • References

    • Customer Review


    Aloxistatin (E64d) is a cell-permeable and irreversible broad-spectrum cysteine protease inhibitor.

    IC50 & Target

    Cysteine protease[1]

    In Vitro

    Inhibition of protease-resistant prion protein (PrP-res) accumulation in ScNB cells by cysteine protease inhibitor Aloxistatin (E64d) with IC50 of 0.5±0.11 μM. For the cell surface PrP-sen detection, PrP-sen is immunoprecipitated from media treated with phosphatidylinositol-specific phospholipase C (PIPLC) to release pulse-35S-labeled PrP-sen from the cell surface. Aloxistatin is maintained at 15 μM, respectively, in the labeling media of all but the control cells [1]. Aloxistatin (E64d) (which specifically blocks cysteine proteases, but not serine proteases such as granzymes) is able to completely block turnover of the CatL substrate Z-Phe-Arg-aminomethylcoumarin, when pre-incubated with NK-92 or YT 5 cells[2]. Aloxistatin (E64d) is a broad-spectrum cell-permeable inhibitor of cysteine proteases[3].

    In Vivo

    Oral administration of Aloxistatin (E64d) to guinea pigs results in a dose-dependent reduction in brain, CSF and plasma Aβ(40) and Aβ(42). Aloxistatin also causes a biphasic dose-dependent reduction in brain CTFβ. Aloxistatin causes a dose-dependent increase in brain sAβPPα. The mean sAβPPα levels are significantly higher than the no dose group for Aloxistatin doses of 5 mg/kg/day or greater with the highest Aloxistatin dose resulting in the maximum increase in sAβPPα of about 54% more than the control group. Similar to the Aβ effect, oral Aloxistatin administration produces a biphasic dose-dependent reduction in brain cathepsin B activity. The minimum effective dose is about 1 mg/kg/day with the highest Aloxistatin dose causing the maximum reduction in brain cathepsin B activity of about 91% lower than that of the control group. Thus, Aloxistatin reduces guinea pig brain cathepsin B activity in a manner which is consistent with the compound inhibiting cathepsin B β-secretase activity[4]. Aloxistatin (E64d) inhibits the increases in the expression of AT1AR and ACE genes in rats. Administration of Olmesartan or Aloxistatin reduces the increase in the superoxide production of the intramyocardial coronary arteries in HF rats[5].

    Molecular Weight




    CAS No.



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    Room temperature in continental US; may vary elsewhere

    Powder -20°C 3 years
      4°C 2 years
    In solvent -80°C 6 months
      -20°C 1 month
    Solvent & Solubility
    In Vitro: 

    DMSO : ≥ 23 mg/mL (67.17 mM)

    *"≥" means soluble, but saturation unknown.

    Stock Solutions
    Concentration Solvent Mass 1 mg 5 mg 10 mg
    1 mM 2.9203 mL 14.6015 mL 29.2030 mL
    5 mM 0.5841 mL 2.9203 mL 5.8406 mL
    10 mM 0.2920 mL 1.4602 mL 2.9203 mL
    *Please refer to the solubility information to select the appropriate solvent.
    In Vivo:
    • 1.

      Add each solvent one by one:  10% DMSO    40% PEG300    5% Tween-80    45% saline

      Solubility: ≥ 2.5 mg/mL (7.30 mM); Suspended solution

    • 2.

      Add each solvent one by one:  10% DMSO    90% corn oil

      Solubility: ≥ 2.5 mg/mL (7.30 mM); Clear solution

    *All of the co-solvents are provided by MCE.
    Kinase Assay

    The CTLs and NK cells (0.8×106/mL) are treated with the inhibitors L1 (10-20 μM) or Aloxistatin (20-30 μM) for 24 hr at 37°C in 24-well plates. Cells are then used in 51Cr-release assays or are lysed to examine perforin in Western blots. The inhibitor is also added at the same concentration during the 4 hr reactions in some 51Cr-release assays, as indicated. Cell lysates are prepared using NP-40 lysis buffer (25 mM HEPES, 250 mM NaCl, 2.5 mM ethylenediaminetetraacetic acid, 0.1% volume/volume Nonidet P-40) and total protein concentration is determined using the Bradford assay. Equal amounts of protein are loaded and resolved on 8% SDS-PAGE gels. Human or mouse perforin is detected using the appropriate antibodies as indicated. Anti-actin antibody is used as a loading control[2].

    MCE has not independently confirmed the accuracy of these methods. They are for reference only.

    Cell Assay

    Cell proliferation and apoptosis are assessed by staining for a proliferation marker, Ki67, or an apoptotic marker, cleaved caspase 3, following the protocol described above for the polarity markers. MCF10 variants are grown in 3D rBM overlay cultures for 4 days and are treated with 0.1 % DMSO, 5 μM CA074Me or 5 μM Aloxistatin. The percentage of structures that are positive for Ki67 or cleaved caspase 3 is determined by counting a total of 100 structures on two separate coverslips with a Zeiss Axiophot epifluorescent microscope. Structures are considered Ki67 positive if they contained at least one cell staining for Ki67. Structures are considered to be caspase 3 positive if they contained at least one cell that is positive for cleaved caspase 3 and the positive cell(s) is not localized in the center of a developing lumen[3].

    MCE has not independently confirmed the accuracy of these methods. They are for reference only.

    Animal Administration

    Mice and Pigs[4]
    Guinea Pigs (male, Hartley strain, average weight 400 g corresponding to animals about 6 weeks old) are used. Male transgenic mice expressing human AβPP containing the wt β-secretase site and the London mutant β-secretase site sequences are used. Delivering a drug by gavage offers the advantage of accurate dosing but is traumatic and thus only suitable for relatively short dosing periods (up to about a week). Delivery by gavage is used for the guinea pig studies. Aloxistatin is suspended in Me2SO at the indicated concentrations (0.1, 1.0, 5, and 10 mg/kg) and administered by gavage daily using a feeding tube. Vehicle control animals are treated by gavage of Me2SO alone.
    Male inbred DS rats are used. Weaned rats are fed laboratory chow containing 0.3% NaCl until 7 weeks of age. DS rats fed an 8% NaCl diet after 7 weeks manifest compensated concentric left ventricular (LV) hypertrophy secondary to hypertension at 12 weeks and a distinct stage of fatal LV failure with lung congestion at 19 weeks. DS rats are therefore fed an 8% NaCl diet from 7 weeks of age and are randomized to an HF group, an Aloxistatin group (10 mg per kg of body mass per day, administered intraperitoneally every other day), or an olmesartan group (3 mg/kg per day in chow) from 12 to 19 weeks of age (n=10 for each group). The doses of olmesartan (an ARB) and Aloxistatin are determined in preliminary experiments and previous studies. DS rats maintained on the 0.3% NaCl diet served as age-matched controls (control group, n=10). At 19 weeks of age, all of the rats are euthanized by an intraperitoneal overdose of sodium pentobarbital (50 mg/kg), and the hearts are removed for biological and histological analyses. Arterial blood is collected from the abdominal aorta for the measurement of renin activity. Systolic blood pressure and heart rate are measured in conscious rats from 7 weeks of age, every week, using a noninvasive tail-cuff method. In separate experiments, 12-week-old DS rats, fed a low-salt diet from 7 weeks of age, are given vehicle, olmesartan, or Aloxistatin in the same manner as in the above experiments (n=5 for each group), and the LV tissues for measuring targeting mRNAs and protein levels are immediately placed in liquid nitrogen and stored at -80°C.

    MCE has not independently confirmed the accuracy of these methods. They are for reference only.


    Purity: 98.22%

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