PF-562271

Description

PF-562271 is a potent, ATP-competitive, reversible inhibitor of FAK with IC50 of 1.5 nM in cell-free assays, ~10-fold less potent for Pyk2 than FAK and >100-fold selectivity against other protein kinases, except for some CDKs.

In vitro

PF-562271 binds in the ATP-binding cleft of FAK, forming two of the three “canonical” H-bonds between the inhibitor and main-chain atoms in the kinase hinge region. PF-562271 is potent in an inducible cell-based assay measuring phospho-FAK with IC50 of 5 nM. PF-562271 (3.3 μM) results in G1 arrest of PC3-M cells. PF-562271 (1 nM) blocks bFGF-stimulated blood vessel angiogenesis as performed in chicken chorioallantoic membrane assays. PF-262271 potently blocks blood vessel sprouting without detectable changes in vascular leakage. PF-562271 (250 nM) results in complete inhibition of collective A431 cell invasion into collagen gels.

In vivo

PF-562271 (< 33 mg/kg p.o.) inhibits FAK phosphorylation in tumors in a dose-and time-dependent manner in U87MG-bearing mice. PF-562271 (50 mg/kg p.o. bid) results in 86% tumor growth inhibition in BxPc3 xenografts mice and 45% tumor growth inhibition in PC3-M xenografts mice. PF-562271 (25 mg/kg, bid) results in 2-fold greater apoptosis in treated tumors in mice bearing H125 lung xenografts. PF-562271 (33 mg/kg, p.o.) inhibits extensive movement of the tumor cells over 24 hours in mice. PF-562271 (33 mg/kg, p.o.) results in altered E-cadherin dynamics in mice, which correlates with reduced E-cadherin–dependent collective cell movement. PF-562271 (25 mg/kg, p.o. bid) results in 62% tumor growth inhibition in PC3M-luc-C6 subcutaneuous local implant xenograft mouse model. PF-562,271 (5 mg/kg, oral) results in significant and similar increases in osteocalcin and cancellous bone parameters and a decrease in tumor growth and signs of bone healing in rats implanted with MDA-MB-231 cells in the tibia.

Uses

A potent, ATP-competitive and reversible inhibitor of FAK and Pyk2 catalytic activity with IC50s of 1.5 nM and 14 nM, respectively.

Uses

PF-56227 is a potent, ATP-competitive, reversible inhibitor of focal adhesion kinase (FAK). Potent FAK inhibitor.

Definition

ChEBI: N-methyl-N-[3-[[[2-[(2-oxo-1,3-dihydroindol-5-yl)amino]-5-(trifluoromethyl)-4-pyrimidinyl]amino]methyl]-2-pyridinyl]methanesulfonamide is a member of indoles.

Biological Activity

pf-562271 is a potent, atp-competitive and reversible inhibitor of both focal adhesion kinase (fak), a non-receptor tyrosine kinase involved in a variety of cellular events, and proline-rich tyrosine kinase 2 (pyk2), an fak homolog containing 48% amino acid identity, with half maximal inhibitory concentration (ic50) of 1.5 nmol/l and 14 nmol/l respectively. as a potential therapeutic agent either alone or in combination with other agents for the treatment of cancer, pf-562271 has been reported to effectively inhibit the proliferation of tumors in both xenograft and transgenic mouse models, in which it dose-dependently inhibits fak phosphorylation in tumor-bearing mice with half maximal effective concentration (ec50) of 93 ng/ml.

Enzyme inhibitor

This potent, yet reversible ATP-competitive protein kinase inhibitor (FWfreebase = 507.49 g/mol; CAS 717907-75-0; FWHCl-Salt = 543.95 g/mol; FW = 665.66 g/mol (benzenesulfonate salt); CAS 939791-38-5), also named, N- [3-[[[2-[(2,3-dihydro-2-oxo-1H-indol-5-yl)amino]-5-(trifluoromethyl)-4- pyrimidinyl]amino]methyl]-2-pyridinyl]-N-methylmethanesulfonamide, targets Focal Adhesion Kinase, or FAK, (IC50 = 1.5 nM), with about 10x greater potency than for Pyk2 (IC50 = 14 nM) and >100x more than for other protein kinases. PF-562271 binds within the ATP-binding cleft of FAK, where it forms two of the three “canonical” H-bonds between the inhibitor and main-chain atoms in the protein kinase’s hinge region. Mode of Inhibitory Action: Many cancer cells grow in an anchorage-independent manner, and the nonreceptor tyrosine kinase FAK is thought to contribute to this phenotype by localizing in focal adhesion plaques and has playing roles as a scaffolding and signaling component. Integrin signals within the tumor microenvironment also affect cancer cell survival and invasion during tumor progression, and FAK is activated by b-integrins in both normal and transformed cells. PF-562271 inhibits FAK phosphorylation in vivo in a dose-dependent fashion (calculated EC50 = 93 ng/mL) after p.o. administration to tumor-bearing mice. PF-562271 also has potent effects on metastatic prostate cancer growth in vivo. Oral administration of PF-562271 at a dose of 5 mg/kg suppressed the growth and local spread of intratibial tumors and restored tumor-induced bone loss. The unique ability of PF-562271 to both curb tumor growth and safely increase bone formation may be an effective therapy for many cancer patients with bone metastases and cancer-associated osteoporosis.

target

FAK

References

[1]stokes jb, adair sj, slack-davis jk, walters dm, tilghman rw, hershey ed, lowrey b, thomas ks, bouton ah, hwang rf, stelow eb, parsons jt, bauer tw. inhibition of focal adhesion kinase by pf-562,271 inhibits the growth and metastasis of pancreatic cancer concomitant with altering the tumor microenvironment. mol cancer ther. 2011 nov;10(11):2135-45. doi: 10.1158/1535-7163.mct-11-0261. epub 2011 sep 8.
[2]roberts wg, ung e, whalen p, cooper b, hulford c, autry c, richter d, emerson e, lin j, kath j, coleman k, yao l, martinez-alsina l, lorenzen m, berliner m, luzzio m, patel n, schmitt e, lagreca s, jani j, wessel m, marr e, griffor m, vajdos f. antitumor activity and pharmacology of a selective focal adhesion kinase inhibitor, pf-562,271. cancer res. 2008 mar 15;68(6):1935-44. doi: 10.1158/0008-5472.can-07-5155.