In vitro activity: PF-06409577 activates AMPK α1β1γ1 and α2β1γ1 isoforms with EC50 of 7.0 nM and 6.8 nM but was much less active against α1β2γ1/α2β2γ1/α2β2γ3 AMPK isoforms with EC50 greater 4000 nM

Kinase Assay: PF-06409577 is prepared in DMSO. PF-06409577 is incubated with fully phosphorylated AMPK in assay buffer at room temperature for 15 min followed by addition of PP2a and another incubation for 60 min at room temperature. The phosphatase treatment is quenched and the kinase assay initiated with the addition of okadaic acid (50 nM final), 50 nM Cy-5 SAMS peptide and ATP equal to Km for each isoform. Reactions are incubated for an additional 60 min and the kinase reaction is quenched with the addition of 10 mM EDTA and 2 nM Eu-pACC antibody in detection Buffer. Kinase activity is monitored by excitation at 320 nM and measuring emission at 665 and 615 nM, respectively.

Cell Assay: PF-06409577 possesses similar potency toward the human and rat α1β1γ1 isoforms. In broad panel screening against other receptors, channels, PDEs and kinases, PF-06409577 exhibits minimal off-target pharmacology. PF-06409577 shows no detectable inhibition of hERG in a patch-clamp assay (100 μM) and is not an inhibitor (IC50>100 μM) of the microsomal activities of major human cytochrome P450 isoforms.