1. Apoptosis
    Metabolic Enzyme/Protease
    Cell Cycle/DNA Damage
  2. MDM-2/p53

Pifithrin-μ (Synonyms: PFTμ; 2-Phenylethynesulfonamide)

Cat. No.: HY-10940
Handling Instructions

Pifithrin-μ is an inhibitor of p53 and HSP70, with antitumor and neuroprotective activity.

For research use only. We do not sell to patients.
Pifithrin-μ Chemical Structure

Pifithrin-μ Chemical Structure

CAS No. : 64984-31-2

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10 mg USD 95 Get quote

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Customer Review

  • Biological Activity

  • Protocol

  • Technical Information

  • Purity & Documentation

  • References


Pifithrin-μ is an inhibitor of p53 and HSP70, with antitumor and neuroprotective activity.

IC50 & Target

p53[1], HSP70[2]

In Vitro

Pifithrin-μ (10 μM) is a p53 inhibitor, which inhibits p53 binding to mitochondria by reducing its affinity to antiapoptotic proteins Bcl-xL and Bcl-2 but has no effect on p53-dependent transactivation, activity of caspases 2, 8, 9 and 10 in a cell-free system, or NF-κB-dependent transcription[1]. Pifithrin-μ (PES) time- and dose-dependently reduces viability in A549 cells, with IC50s of 44.9 and 25.7 µM at 24 h and 48 h. Pifithrin-μ (20 μM) suppresses the cell migration, induces cell cycle arrest and cell apoptosis in A549 and H460 cells. Pifithrin-μ (10 or 20 µM) inhibits activities of AKT, ERK, and Hsp70 in A549 and H460 cells. Pifithrin-μ (20 µM) sensitizes A549 and H460 cell lines to TRAIL-induced cell proliferation inhibition and apoptosis[2].

In Vivo

Pifithrin-μ (40 mg/kg, i.p.) shows no protective effect against doses of radiation that cause gastrointestinal syndrome in mice[1]. Pifithrin-μ (PES, 10 mg/kg) shows antitumor effect in mice bearing A549 cells[2]. Pifithrin-μ exhibits neuroprotective effect with the P53-inhibitor pifithrin-μ after cardiac arrest in a rodent model[3].

Preparing Stock Solutions
Concentration Volume Mass 1 mg 5 mg 10 mg
1 mM 5.5185 mL 27.5923 mL 55.1846 mL
5 mM 1.1037 mL 5.5185 mL 11.0369 mL
10 mM 0.5518 mL 2.7592 mL 5.5185 mL
Please refer to the solubility information to select the appropriate solvent.
Cell Assay

Pifithrin-μ is dissolved in DMSO[2].

The cell viability is determined by the Cell Counting Kit-8 assay. Briefly, A549 and H460 cells are incubated in 96-well plates at a density of 5 × 103 per 100 µL of culture medium overnight. After treated with indicated concentration of Pifithrin-μ for 24 and 48 h, 10 µL of tetrazolium substrate are added to each well of the plate. After incubation at 37°C for 1 h, the absorbance is recorded at a wavelength of 450 nm using a microplate reader. Each experiment is determined in triplicate and repeated at least three times[2].
MCE has not independently confirmed the accuracy of these methods. They are for reference only.

Animal Administration

Pifithrin-μ is formulated in PBS[2].

A549 cells (1 × 107) are suspended in Matrigel and inoculated subcutaneously into the mice. Twelve mice bearing evident tumors are arbitrarily assigned to PBS control group and Pifithrin-μ treatment groups (six mice per group). When tumors reach a size of ∼5×5 mm2, mice are treated with either a single of intraperitoneal injection of Pifithrin-μ (20 mg/kg) or PBS every two days. After 3-week treatment, mice are euthanized with carbon dioxide. Tumor burdens are evaluated by measuring body weight, tumor weight, and tumor volume. Tumor volume is determined as 0.5 × length × width2. Tumor samples are collected and fixed in 10% neutral buffered formalin. Hematoxylin and eosin staining and immunohistochemistry for histological analysis of tumor samples are measured[2].
MCE has not independently confirmed the accuracy of these methods. They are for reference only.

Molecular Weight









Please store the product under the recommended conditions in the Certificate of Analysis.


Room temperature in continental US; may vary elsewhere

Solvent & Solubility


* "<1 mg/mL" means slightly soluble or insoluble. "≥" means soluble, but saturation unknown.

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