Zelavespib  (Synonyms: PU-H71)

Zelavespib (PU-H71) is a potent Hsp90 inhibitor, with an IC₅₀ of 51 nM in MDA-MB-468 cells.

Zelavespib is a potent Hsp90 inhibitor, with an IC₅₀ of 51 nM in MDA-MB-468 cells. Zelavespib inhibits the growth of several tumor cells, such as MDA-MB-468, MDA-MB-231 and HCC-1806 cells, with IC₅₀s of 65 ± 8 nM, 140 ± 5 nM and 87 ± 3 nM, respectively, and such inhibition is associated with a G2-M block arrest. Zelavespib (10-1000 nM) induces significant apoptosis in triple-negative breast cancers (TNBCs). Zelavespib (0.5, 1 μM) also downregulates oncoproteins involved in the invasive potential of TNBCs^[1]. Zelavespib (0.5 μM) decreases and depletes the BCR signaling kinases. Zelavespib (0.25-10 μM) is cytotoxic to CLL cells but shows minimal effects on PBMC or resting B cells. In addition, Zelavespib (0-1 μM) reduces CLL viability via the induction of mitochondrial apoptosis, and antagonizes the survival signals from CLL microenvironment at 0.5 μM^[2]. Zelavespib (0.05 μM) induces apoptosis of MDA-MB-231, BT-474, and MCF7 cells, and such induction is enhanced by TNF-α. Zelavespib (0.05 μM) degradates IKKβ, and down-regulates the NF-κB transcriptional activity induced by TNF-α treatment^[3].

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

Zelavespib (75 mg/kg, i.p.) causes intratumor accumulation, extends down-regulation of anti-tumor driving molecules, completes and retains responses at nontoxic doses in MDA-MB-468 tumor-bearing mice. Zelavespib(75 mg/kg 3×week, i.p.) suppresses the gowth of tumors, and such an effect is associated with down-regulation of several Hsp90-regulated malignancy driving proteins^[1].

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

512.37

C₁₈H₂₁IN₆O₂S

873436-91-0

Solid

White to off-white

CC(C)NCCCN1C(SC2=C(C=C3OCOC3=C2)I)=NC4=C(N=CN=C14)N

Room temperature in continental US; may vary elsewhere.

* Please refer to the solubility information to select the appropriate solvent. Once prepared, please aliquot and store the solution to prevent product inactivation from repeated freeze-thaw cycles.
Storage method and period of stock solution: -80°C, 6 months; -20°C, 1 month. When stored at -80°C, please use it within 6 months. When stored at -20°C, please use it within 1 month.

• [1]. Caldas-Lopes E, et al. Hsp90 inhibitor PU-H71, a multimodal inhibitor of malignancy, induces complete responses in triple-negative breast cancer models. Proc Natl Acad Sci U S A. 2009 May 19;106(20):8368-73.  [Content Brief]

  [2]. Guo A, et al. HSP90 stabilizes B-cell receptor kinases in a multi-client interactome: PU-H71 induces CLL apoptosis in a cytoprotective microenvironment. Oncogene. 2017 Jun 15;36(24):3441-3449.  [Content Brief]

  [3]. Qu Z, et al. PU-H71 effectively induces degradation of IκB kinase β in the presence of TNF-α. Mol Cell Biochem. 2014 Jan;386(1-2):135-42.  [Content Brief]