PRKAA1 and lung adenocarcinoma: To find the potential association of AMPK with MLK3-JNK and to search for additional kinases upstream of AMPK independent of LKB1, we chose lung adenocarcinoma A549 cell line lacking LKB1 and established a stable A549 cell line by infection of lentivirus carrying LKB1 cDNA (Fig 2A).