Pifithrin-α (PFTα) HBr
For research use only.
CAS No. 63208-82-2
Pifithrin-α is an inhibitor of p53, inhibiting p53-dependent transactivation of p53-responsive genes. Pifithrin-α is also a potent agonist of the aryl hydrocarbon receptor (AhR).
Selleck's Pifithrin-α (PFTα) HBr has been cited by 64 publications
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Choose Selective p53 Inhibitors
|Description||Pifithrin-α is an inhibitor of p53, inhibiting p53-dependent transactivation of p53-responsive genes. Pifithrin-α is also a potent agonist of the aryl hydrocarbon receptor (AhR).|
Pifithrin-α inhibits p53-dependent transactivation of p53-responsive genes in ConA cells. Pifithrin-α (10 μM) inhibits apoptotic death of C8 cells induced by Dox, etoposide, Taxol, cytosine arabinoside. Pifithrin-α inhibits p53-dependent growth arrest of human diploid fibroblasts in response to DNA damage but has no effect on p53-deficient fibroblasts. Pifithrin-α may modulate the nuclear import or export (or both) of p53 or may decrease the stability of nuclear p53.  Pifithrin-α (100-200 nM) completely suppresses the camptothecin-induced increase in the level of p53 DNA binding as well as the p53-responsive gene Bax in hippocampal cell. Pifithrin-α also decreases the basal level of p53 DNA-binding activity. Pifithrin-α (200 nM) protects cultured hippocampal neurons against death induced by DNA-damaging agents. Pifithrin-α (200 μM) stabilizes mitochondrial function, suppresses caspase activation and protects cultured hippocampal neurons against death induced by glutamate and amyloid β-peptide.  Pifithrin α, in addition to p53, can suppress heat shock and glucocorticoid receptor signaling but has no effect on nuclear factor-kappaB signaling. Pifithrin α (10 μM) reduces activation of heat shock transcription factor (HSF1) and increases cell sensitivity to heat. Pifithrin α (10 μM) reduces activation of glucocorticoid receptor and rescues mouse thymocytes from apoptotic death after dexamethasone treatment in HeLa cells.  PFTalpha blocks p53-mediated induction of p21/Waf-1 in human embryonic kidney cells. PFTalpha does, however, cause a left shift in the dexamethasone dose response curve by increasing intracellular dexamethasone concentration. 
|In vivo||Pifithrin-α (2.2 mg/kg i.p.) treatment completely rescues mice (C57BL and Balb/c) of both strains from 60% killing doses of gamma irradiation (8 Gy for C57BL and 6 Gy for Balb/c). Pifithrin-α-injected mice lost less weight than irradiated mice that are not pretreated with the Pifithrin-α. Pifithrin-α (2.2 mg/kg) abrogates p53-dependent regulation of DNA replication after whole-body gamma irradiation in mice.  Pifithrin-α (2 mg/kg i.p.) 30 min prior to middle cerebral artery occlusion treatment of mice reduces ischemic brain injury and protects hippocampal neurons against excitotoxic injury.  Pifithrin α (3.6 μg/kg i.p.) inhibits Dex-induced degeneration of the thymus in mice.  Pifithrin α (2 mg/kg) results in a significantly lower degree of motor disability in rats receiving transient occlusion of the middle cerebral artery as compared with controls. Pifithrin α-treated animals has less motor disability and smaller infarcts when the drug is administered up to an hour after stroke onset. Pifithrin α results in significantly lower motor disability scores in rats than in the vehicle-treated animals at 7 days post-op. Pifithrin α results in significant reduction of apoptosis in rats as indicated by Tunel and caspase 3 staining. |
-  Komarov PG, et al. Science, 1999, 285(5434), 1733-1737.
-  Culmsee C, et al. J Neurochem, 2001, 77(1), 220-228.
-  Komarova EA, et al. J Biol Chem, 2003, 278(18), 15465-15468.
|In vitro||DMSO||67 mg/mL (182.41 mM)|
|In vivo||Add solvents to the product individually and in order(Data is from Selleck tests instead of citations):
5% DMSO+ 40% PEG 300+ 5%Tween80+ 50%ddH2O
For best results, use promptly after mixing.
* 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.
In vivo Formulation Calculator (Clear solution)
|Step 1: Enter information below (Recommended: An additional animal making an allowance for loss during the experiment)|
|Dosage||mg/kg||Average weight of animals||g||Dosing volume per animal||ul||Number of animals|
|Step 2: Enter the in vivo formulation ()|
|% DMSO % % Tween 80 % ddH2O|
Working concentration： mg/ml；
Method for preparing DMSO master liquid: ： mg drug pre-dissolved in μL DMSO (Master liquid concentration mg/mL，)
Method for preparing in vivo formulation：Take DMSO master liquid, next addμL PEG300， mix and clarify, next addμL Tween 80，mix and clarify, next add μL ddH2O，mix and clarify.
1.Please make sure the liquid is clear before adding the next solvent.
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