Lung cancer presents the highest mortality rate in the world when compared to other cancer types and often presents chemotherapy resistance to cisplatin. The A549 nonsmall cell lung cancer line is widely used as a model for lung adenocarcinoma studies since it presents a high proliferative rate and a nonsense mutation in the STK11 gene. The LKB1 protein, encoded by the STK11 gene, is one of the major regulators of cellular metabolism through AMPK activation under nutrient deprivation. Mutation in the STK11 gene in A549 cells potentiates cancer hallmarks, such as deregulation of cellular metabolism, aside from the Warburg effect, mTOR activation, autophagy inhibition, and NRF2 and redox activation. In this study, we investigated the integration of these pathways associated with the metabolism regulation by LKB1/AMPK to improve cisplatin response in the A549 cell line. We first used the CRISPR/Cas9 system to generate cell lines with a CRISPR-edited LKB1 isoform (called Super LKB1), achieved through the introduction of a +1 adenine insertion in the first exon of the STK11 gene after NHEJ-mediated repair. This insertion led to the expression of a higher molecular weight protein containing an alternative exon described in the Peutz-Jeghers Syndrome. Through metabolic regulation by Super LKB1 expression and AMPK activation, we found an increase in autophagy flux (LC3 GFP/RFP p <
0.05), as well as a reduction in the phosphorylation of mTORC1 downstream targets (S6K2 phospho-serine 423
p <
0.05
and S6 ribosomal protein phospho-serine 240/244
p <
0.03). The NRF2 protein exhibited increased levels and more nuclear localization in A549 WT cells compared to the edited cells (p <
0.01). We also observed lower levels of H