LFM-A13 (244240-24-2) is a selective inhibitor of Bruton’s tyrosine kinase (BTK) – IC50‘s = 2.5 μM (recombinant BTK) and 17.2 μM (human BTK).1,2 It has also been shown to inhibit Polo-like kinase (PLK) – IC50 = 61 μM for human PLK3.3 LFM-A13 displayed no activity (concentrations up to 278 μM) at JAK1, JAK3, HCK, EGFRK and IRK2 or CDK1-3, CHK1, IKK, MAPK1, SAPK2a and ten other tyrosine kinases.3
LFM-A13 is a potent inhibitor of Polo-like kinase (PLK), used for anti-breast cancer activity. Also a specific Bruton’s tyrosine kinase inhibitor.
lfm-a13 inhibited recombinant btk expressed in a baculovirus expression vector system. besides its remarkable potency in btk kinase assays, lfm-a13 was also found to be a highly specific inhibitor of btk. even at very high concentrations, lfm-a13 did not affect the activity of other protein tyrosine kinases [1].
lfm-a13 exhibited a favorable pharmacokinetic behavior which was not adversely affected by the standard chemotherapy drugs and significantly improved the chemotherapy response and survival outcome of bcl-1 leukemia cells challenged mice. while only 14% of mice treated with the standard triple-drug combination treatment became long-term survivors, 41% of mice treated with this combination plus lfm-a13 survived long-term [2].
1) Vassilev et al. (1999), Bruton’s tyrosine kinase as an inhibitor of the Fas/CD95 death-inducing signaling complex; J. Biol. Chem., 274 1646
2) Mahajan et al. (1999), Rational design and synthesis of a novel-anti-leukemic agent targeting Bruton’s tyrosine kinase (BTK), LFM-A13 [α-cyano-β-hydroxy-β-methyl-N-(2,5-dibromophenyl)propenamide]; J. Biol. Chem. 274 9587
3) Uckun et al. (2007) Anti-breast cancer activity of LFM-A13, a potent inhibitor of polo-like kinase (PLK); Bioorg. Med. Chem. 15 800
