Zelavespib (PU-H71)

Catalog No.S8039 Batch:S803902

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Technical Data

Formula

C18 H21 I N6 O2 S
Molecular Weight 512.37 CAS No. 873436-91-0
Solubility (25°C)* In vitro DMSO 100 mg/mL (195.17 mM)
Water 34 mg/mL (66.35 mM)
Ethanol 0.875 mg/mL (1.7 mM)
* <1 mg/ml means slightly soluble or insoluble.
* Please note that Selleck tests the solubility of all compounds in-house, and the actual solubility may differ slightly from published values. This is normal and is due to slight batch-to-batch variations.
* Room temperature shipping (Stability testing shows this product can be shipped without any cooling measures.)

Preparing Stock Solutions

Biological Activity

Description Zelavespib (PU-H71, NSC 750424) is a potent and selective inhibitor of HSP90 with IC50 of 51 nM. Phase 1.
Targets
HSP90 [1]
51 nM
In vitro PU-H71 (1 μM) potently suppresses the growth of triple-negative breast cancers (TNBC) cell lines MDA-MB-468, MDA-MB-231, and HCC-1806 with IC50 of 65, 140 and 87 nM, respectively. PU-H71 (1 μM) kills 80%, 65%, and 80% of the initial population of MDA-MB-468, MDA-MB-231, and HCC-1806 cells, respectively. PU-H71 (0.25-1 μM) induces a dose-dependent degradation or inactivation of tumor driving molecules, including EGFR, IGF1R, HER3, c-Kit, Raf-1and Akt. Treatment for 24 h with 1 μM PU-H71, augments the percent of cells in G2-M phase of MDA-MB-468 to 69%, mediated by reduction in CDK1 and Chk1 expression. PU-H71 induces apoptosis in TNBC in part by inactivation and downregulation of Akt and Bcl-xL. PU-H71 leads to a proteasome-mediated reduction in IRAK-1 and TBK1 levels, resulting in approximately 84% and 90% reduction in NF-κB activity in MDA-MB-231 cells treated with 0.5 and 1μM PU-H71, respectively. PU-H71 markedly contains MDA-MB-231 cell invasion, with 90% suppression at 1 μM. [1] PU-H71 (2.5 μM) generates endoplasmic reticulum (ER) stress and activated the Unfolded Protein Response (UPR) as evidenced by XBP1 mRNA splicing (2.3-fold) and up-regulation of Grp94 (3.7-fold), Grp78 (4.9-fold), and CHOP (48-fold) protein expression and ATF4 (1.8-fold) mRNA expression. PU-H71 (1 μM) induces the mitochondrial pathway of apoptosis in HeLa cells, mediated by caspase but not calpain activation. In response to PU-H71-induced ER stress, apoptosis is triggered in melanoma, cervix, colon, liver and lung cancer cells, but not in normal human fibroblasts. PU-H71 is able to induce apoptosis overcoming the resistance conferred by Bcl-2. [2] PU-H71 (30 n M) significantly reduces NOS2 activity (60% reduction) and expression in LI (1 μg/mL LPS and 5 ng/mL IFN γ)-stimulated astrocytes via inhibiting NF-κB element activation. PU-H71 displays similar effects on microglial cells as on astrocytes, with 50 nM PU-H71 needed to significantly reduce the LPS dependent nitrite release. [3]
In vivo PU-H71 administered at 75 mg/kg a.d. in the MDA-MB-231 model, induces a 100% complete response, and tumors are reduced to scar tissue after 37 days of treatment, accompanied with reduction in many proliferative and anti-apoptotic molecules, namely an 80%, 95%, 99%, 80%, and 65% decrease in EGFR, HER3, Raf-1, Akt, and p-Akt, respectively. PU-H71 (75 mg/kg, 3 times per week) induces a 96% inhibition of tumor growth, accompanied by an 60% reduction in tumor cell proliferation, an 85% decline in activated Akt associated with survival and high invasive potential, and a 6-fold increase in apoptosis. [1]
Features Purine-based, HSP90-selective inhibitor.

Protocol (from reference)

Kinase Assay:

[1]
  • HSP90 binding assay

    Measurements are performed in black 96-well microtiter plates. Cell lysates are prepared by rupturing cellular membranes by freezing at -70℃ and dissolving the cellular extract in HFB [20 mM Hepes (K), pH 7.3, 50 mM KCl, 5 mM MgCl2, 20 mM Na2MoO4, 0.01% Nonidet P-40] with added protease and phosphatase inhibitors. Saturation curves are recorded in which fluorescently labeled geldanamycin (Cy3B-GM) (3 nM) is treated with increasing amounts of cellular lysates. The amount of lysate that results in polarization (mP) readings corresponding to 90%-99% bound ligand is chosen for the competition study. Here, each 96-well plate contains 3 nM Cy3B-GM, cellular lysate (amounts as determined and normalized to total Hsp90 as determined by Western blot analysis using Hsp90 purified from HeLa cells as standard) and tested Hsp90 inhibitor in a final volume of 100 μL. The plate is left for 24 h on a shaker at 4 ℃, and the fluorescence polarization (FP) values in mP are recorded. EC50 values are determined as the competitor concentrations at which 50% of the Cy3B-GM is displaced. FP measurements are performed on an Analyst GT microplate reader.
Cell Assay:

[1]
  • Cell lines

    Human triple-negative breast cancers cell line MDA-MB-231

  • Concentrations

    ~5μM

  • Incubation Time

    3 days

  • Method

    Exponentially growing MDA-MB-231 cells are seeded into black 96-well microtiter plates and incubated in medium containing either vehicle control (DMSO) or compounds for the indicated time at 37 ℃. Plates containing 3 replicate wells per assay condition are seeded at a density of 8×103 cells for each cell line in 100μL medium. After exposure of cells to the Hsp90 inhibitors, plates are equilibrated to room temperature (20-25 ℃) for approximately 30 min, and 100 μL CellTiter-Glo reagent are added to each well. Plates are mixed for 2 min on an orbital shaker and then incubated for 15 min to 2 h at room temperature. The luminescence signal in each well is measured in an Analyst GT microplate reader.
Animal Study:

[1]
  • Animal Models

    Human triple-negative breast cancers xenografts MDA-MB-231

  • Dosages

    75 mg/kg

  • Administration

    i.p. on an alternate day schedule

Customer Product Validation

Data from [Data independently produced by , , Cell, 2017, 168(5):856-866]

Selleck's Zelavespib (PU-H71) has been cited by 13 publications

Small molecule inhibitor targeting the Hsp70-Bim protein-protein interaction in estrogen receptor-positive breast cancer overcomes tamoxifen resistance [ Breast Cancer Res, 2024, 26(1):33] PubMed: 38409088
High CD142 Level Marks Tumor-Promoting Fibroblasts with Targeting Potential in Colorectal Cancer [ Int J Mol Sci, 2023, 24(14)11585] PubMed: 37511344
Radiosynthesis and preclinical evaluation of [11C]SNX-ab as an Hsp90α,β isoform-selective PET probe for in vivo brain and tumour imaging [ EJNMMI Radiopharm Chem, 2023, 8(1):2] PubMed: 36715827
Development of a First-in-Class Small-Molecule Inhibitor of the C-Terminal Hsp90 Dimerization [ ACS Cent Sci, 2022, 8(5):636-655] PubMed: 35647282
BCL-xL inhibition potentiates cancer therapies by redirecting the outcome of p53 activation from senescence to apoptosis [ Cell Rep, 2022, 41(12):111826] PubMed: 36543138
A first-in-class Polymerase Theta Inhibitor selectively targets Homologous-Recombination-Deficient Tumors [ Nat Cancer, 2021, 2(6):598-610] PubMed: 34179826
[ Mol Cell Biol, 2020, ] PubMed: 32868290
ARID1A Regulates Transcription and the Epigenetic Landscape via POLE and DMAP1 while ARID1A Deficiency or Pharmacological Inhibition Sensitizes Germ Cell Tumor Cells to ATR Inhibition. [ Cancers (Basel), 2020, 7;12(4)] PubMed: 32272809
Evaluation of [11C]NMS-E973 as a PET tracer for in vivo visualisation of HSP90. [ Theranostics, 2019, 9(2):554-572] PubMed: 30809293
Peroxisomes support human herpesvirus 8 latency by stabilizing the viral oncogenic protein vFLIP via the MAVS-TRAF complex. [ PLoS Pathog, 2018, 14(5):e1007058] PubMed: 29746593

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SHIPPING AND STORAGE
Selleck products are transported at room temperature. If you receive the product at room temperature, please rest assured, the Selleck Quality Inspection Department has conducted experiments to verify that the normal temperature placement of one month will not affect the biological activity of powder products. After collecting, please store the product according to the requirements described in the datasheet. Most Selleck products are stable under the recommended conditions.

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