Home MAPK p38 MAPK inhibitor PH-797804 For research use only.

PH-797804

PH-797804 is a novel pyridinone inhibitor of p38α with IC50 of 26 nM in a cell-free assay; 4-fold more selective versus p38β and does not inhibit JNK2. Phase 2.

PH-797804 Chemical Structure

PH-797804 Chemical Structure

CAS No. 586379-66-0

Purity & Quality Control

PH-797804 Related Products

Signaling Pathway

p38 MAPK Signaling Pathways

p38 MAPK Signaling Pathway

Cell Data

Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID
human U937 cells Function assay Inhibition of p38alpha kinase-dependent HSP-27 phosphorylation in human U937 cells, IC50=0.00105 μM 21620699
human monocytes Function assay Antiinflammatory activity in human monocytes assessed as inhibition of LPS-induced TNFalpha production, IC50=0.0034 μM 21620699
human PBMC Function assay Antiinflammatory activity in human PBMC assessed as inhibition of LPS-induced TNFalpha release pretreated for 1 hr before LPS treatment measured after 18 hrs, IC50=0.015 μM 21641211
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Biological Activity

Description PH-797804 is a novel pyridinone inhibitor of p38α with IC50 of 26 nM in a cell-free assay; 4-fold more selective versus p38β and does not inhibit JNK2. Phase 2.
Targets
p38α [1]
(Cell-free assay)		 p38β [1]
(Cell-free assay)
26 nM 102 nM
In vitro
In vitro PH-797804 blocks LPS-induced TNF-α production and p38 kinase activity in the human monocytic U937 cell line, with comparable IC50 of 5.9 nM and 1.1 nM. PH-797804 has no inhibitory effect on either the JNK pathway (c-Jun phosphorylation) or ERK pathway (ERK phosphorylation) in U937 cells at concentrations up to 1 μM. PH-797804 inhibits RANKL- and M-CSF-induced osteoclast formation in a concentration-dependent manner, with IC50 of 3 nM in primary rat bone marrow cells. [1] IC50 values for PH-797804 against the following targets have been determined to be greater than 200 μM (unless specified): CDK2, ERK2, IKK1, IKK2, IKKi, MAPKAP2, MAPKAP3, MKK7 (>100 μM), MNK, MSK (>164 μM), PRAK, RSK2, and TBK1, which means the activity of PH-797804 is specific. [2]
Kinase Assay P38 kinase assay
A resin capture assay method is used to determine the phosphorylation of epidermal growth factor receptor peptide (EGFRP) or GST-c-Jun by p38 kinases. Reactions mixtures contain 25 mM HEPES, pH 7.5, 10 mM magnesium acetate, ATP (at the indicated concentration), 0.05 to 0.3 μCi of [γ-33P]ATP, 0.8 mM dithiothreitol, and either 200 μM EGFRP or 10 μM GST-c-Jun for p38α kinase reactions. The reaction is initiated by the addition of 25 nM p38α kinase to give a final volume of 50 μl. The p38αkinase reactions are incubated at 25 °C for 30 minutes. Under these conditions, the formation of product for both p38αkinase is linear with time. The reaction is stopped, and the unreacted [γ-33P]ATP is removed by the addition of 150 μl of AG 1 × 8 ion exchange resin in 900 mM sodium formate, pH 3.0. Once thoroughly mixed, solutions are allowed to stand for 5 minutes. A 50-μl aliquot of head volume containing the phosphorylated substrate is removed from the mixture and transferred to a 96-well plate. MicroScint-40 scintillation cocktail (150 μL) is added to each well and the radioactivity quantities using a TopCount NXT microplate scintillation and luminescence counter.
Cell Research Cell lines Rheumatoid arthritis synovial fibroblast(s)
Concentrations --
Incubation Time --
Method

Cell viability is evaluated using the 3-(4,5-dimethylthiazol-2-yl)-) diphenyl tetrazolium bromide assay. Absorbance is measured on an ELISA plate reader with a test wavelength of 570 nm and a reference of 630 nm.
In Vivo
In vivo Orally dosing of PH-797804 effectively inhibits acute inflammatory responses induced by systemically administered endotoxin in both rat and cynomolgus monkeys. PH-797804 treatment for 10 days demonstrates robust anti-inflammatory activity in chronic disease models, significantly reducing both joint inflammation and associated bone loss in streptococcal cell wall-induced arthritis in rats and mouse collagen-induced arthritis. Dose-response analysis resulted in ED50 values of 0.07 mg/kg and 0.095 mg/kg in rat and cynomolgus monkeys, respectively. PH-797804 inhibits LPS-induced TNF-α, IL-6, and MK-2 activity in a dose- and concentration-dependent manner in a human endotoxin challenge model. [1]
Animal Research Animal Models LPS-induced chronic inflammation rat model
Dosages 0.001-1 mg/kg
Administration Oral gavage 4 hours before LPS administration
NCT Number Recruitment Conditions Sponsor/Collaborators Start Date Phases
NCT01217918 Completed
Healthy
Pfizer
 October 2010 Phase 1
NCT00827515 Withdrawn
Pain
Pfizer
 February 2009 Phase 1
NCT00614705 Completed
Neuralgia Postherpetic
Pfizer
 April 2008 Phase 2
NCT00620685 Completed
Arthritis Rheumatoid
Pfizer
 March 2008 Phase 2

Chemical Information & Solubility

Molecular Weight 477.3 Formula

C22H19BrF2N2O3
CAS No. 586379-66-0 SDF Download PH-797804 SDF
Smiles CC1=C(C=C(C=C1)C(=O)NC)N2C(=CC(=C(C2=O)Br)OCC3=C(C=C(C=C3)F)F)C
Storage (From the date of receipt)

In vitro
Batch:

DMSO : 96 mg/mL ( (201.13 mM) Moisture-absorbing DMSO reduces solubility. Please use fresh DMSO.)

Ethanol : 20 mg/mL

Water : Insoluble


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In vivo
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Tech Support

Answers to questions you may have can be found in the inhibitor handling instructions. Topics include how to prepare stock solutions, how to store inhibitors, and issues that need special attention for cell-based assays and animal experiments.

Handling Instructions

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