1. Cell Cycle/DNA Damage
    Metabolic Enzyme/Protease
  2. HSP
  3. KNK437

KNK437 (Synonyms: Heat Shock Protein Inhibitor I)

Cat. No.: HY-100110 Purity: >98.0%
Handling Instructions

KNK437 is a HSP inhibitor, and inhibits the induction of HSP105, HSP70, and HSP40.

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

KNK437 Chemical Structure

KNK437 Chemical Structure

CAS No. : 218924-25-5

Size Price Stock Quantity
10 mM * 1 mL in DMSO USD 66 In-stock
Estimated Time of Arrival: December 31
5 mg USD 60 In-stock
Estimated Time of Arrival: December 31
10 mg USD 84 In-stock
Estimated Time of Arrival: December 31
25 mg USD 180 In-stock
Estimated Time of Arrival: December 31
50 mg USD 336 In-stock
Estimated Time of Arrival: December 31
100 mg USD 624 In-stock
Estimated Time of Arrival: December 31
200 mg USD 840 In-stock
Estimated Time of Arrival: December 31
500 mg   Get quote  
1 g   Get quote  

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Customer Review

Based on 2 publication(s) in Google Scholar

Top Publications Citing Use of Products

Publications Citing Use of MCE KNK437

    KNK437 purchased from MCE. Usage Cited in: Fish Shellfish Immunol. 2017 Nov;70:185-194.

    Treatment with KNK437, an antagonist of HSP27, leads to significant up-regulation of RDRP at 24 and 48 hpi.

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    • Biological Activity

    • Protocol

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    • Customer Review


    KNK437 is a HSP inhibitor, and inhibits the induction of HSP105, HSP70, and HSP40.

    IC50 & Target[1]







    In Vitro

    KNK437 inhibits the activation of several HSPs including HSP105, HSP70, and HSP40 in COLO 320DM (human colon carcinoma) cells. KNK437 (100 μM) inhibits thermotolerance in COLO 320DM cells after the first heat treatment. KNK437 shows inhibitory effects on thermotolerance dose-dependently in COLO 320DM cells (0-200 μM) and HeLa S3 cells (100, 200 μM)[1]. KNK437 (100 μM) exhibits inhibitory activities against the methylation of H3-Lys4 before or after heat-treatment in HSC4 cells and KB cells, but does not affect that of H3 Lys9. KNK437 also suppresses the expression of HSP70[3].

    In Vivo

    KNK437 is a weakly toxic agent. KNK437 (62.5-400 mg/kg) recovers bodyweight losses of tumor-free CD-1 (ICR) mice. KNK437 (200 mg/kg) alone shows no antitumor effects and does not increase the thermosensitivity of nontolerant tumors. KNK437 improves the antitumor effects of fractionated heat treatment at 44°C at 200 mg/kg in a synergistic manner. KNK437 (200 mg/kg, i.p.) suppresses the induction of thermotolerance when administrated 6 h before the initial heating[2].

    Molecular Weight




    CAS No.





    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 : ≥ 34 mg/mL (138.65 mM)

    *"≥" means soluble, but saturation unknown.

    Stock Solutions
    Concentration Solvent Mass 1 mg 5 mg 10 mg
    1 mM 4.0778 mL 20.3890 mL 40.7780 mL
    5 mM 0.8156 mL 4.0778 mL 8.1556 mL
    10 mM 0.4078 mL 2.0389 mL 4.0778 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: 1.67 mg/mL (6.81 mM); Suspended solution; Need ultrasonic

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

    Heat treatments at 42°C for 90 min are performed in a CO2 incubator using 25-cm2 plastic flasks. Cells (1 × 105) are seeded in the flasks, incubated at 37°C for 48 h, and then heated by immersing the flasks in a water bath (45°C ± 0.05°C). KNK437 and quercetin are dissolved in DMSO before being added at the indicated concentrations. The final concentration of DMSO in each culture medium is 0.25% (v/v), irrespective of the concentrations of the drugs. The same concentration of DMSO is used as a control. Sodium arsenite is dissolved in PBS at a concentration of 80 mM and added to the medium. Cells are treated with 300 μM sodium arsenite at 37°C for 1.5 h, rinsed, and then incubated at 37°C for 5 h before 45°C heat challenge[1].

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

    Animal Administration

    To subject the tumors to hyperthermia, the right foot of each mouse is immersed in a water bath maintained at the desired temperature to an accuracy of ± 0.05°C. After the mouse has been anesthetized with 50 mg/kg pentobarbital sodium solution, the tumor-bearing leg is pulled down into the water bath using a special sinker (weighing ∼45 g) taped to the skin of the toe. Care is taken not to impair the blood flow in the limb. While the extended right leg is receiving local heat, the mouse is air-cooled. KNK437 is dissolved in olive oil immediately before use. The KNK437 is administered i.p. 6 h before the first heat treatment. It is used mainly at a concentration of 200 mg/kg[2].

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

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    KNK437Heat Shock Protein Inhibitor IKNK 437KNK-437HSPHeat shock proteinsInhibitorinhibitorinhibit

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