MTOR and acute lymphoblastic leukemia: To investigate the role of AMPK and mTOR in this process, we examined the levels of P-mTOR (Ser2448) and P-IRS-1 (Ser794, a residue known to be phosphorylated by AMPK) [31] in CCRF-CEM (T-ALL) and NALM6 (Bp-ALL) cells treated with AICAR.