Description
Focal adhesion kinase (FAK) and proline-rich tyrosine kinase 2 (PYK2) are non-receptor tyrosine kinases that constitute the FAK subfamily and play a vital role in many oncogenic pathways. PF-562271 is an ATP-competitive, reversible inhibitor of FAK (IC
50 = 1.5 nM) that demonstrates 10-fold reduced potency for PYK2 (IC
50 = 14 nM) and >100-fold selectivity against other protein kinases. PF-562271 inhibits FAK phosphorylation with an EC
50 value of 93 ng/ml in glioblastoma-bearing mice and has been shown to regress tumors in multiple xenograft models.
Uses
PF 562271 Besylate is the besylate salt of PF-562271, which is a potent, ATP-competitive, reversible inhibitor of focal adhesion kinase (FAK).
in vivo
PF-562,271 (33 mg/kg, p.o.) inhibits FAK phosphorylation in tumors in a dose- and time-dependent manner in tumor-bearing mice. FAK phosphorylation inhibition relative to total blood concentration of PF-562,271 results in a calculated EC50 of 93 ng/mL. PF-562,271 (25 mg/kg, p.o.) induces apoptosis 2-fold greater in treated tumors compared with vehicle-treated control tumors on day 3[1]. PF-562,271 (33 mg/kg, p.o.) and dasatinib extensively inhibit the movement of tumor cells in the animals. Inhibition of FAK kinase activity following treatment with PF-562,271 results in altered E-cadherin dynamics in vivo[3].
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.
