BMTs activate AMPK through CaMKK and not through intracellular Ca 2+ changes. Serum-starved L6 myotubes were treated with either vehicle (V) alone, BMT-17 at 0.1 µM, 1 µM or 10 µM for 30 min before lysis; 10 µg of lysate was then analysed by Western blot ( A ) and quantified by densitometry ( B ). A representative blot is shown. Serum-starved L6 myotubes were pre-treated with either 150 µM EGTA-AM (+) or diluent (-) for 15 min before then being treated with 10 µM BMT-17 or vehicle for a further 30 min before lysis. AMPK was then isolated from 50 µg lysate by pan-AMPKβ immunoprecipitation and assessed by AMPK in vitro kinase assay ( C ). Data are means relative to untreated vehicle control (V) ± SEM from 5 independent experiments. *p