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bioRxiv · 10.1101/2022.03.08.483452

A CRISPR screen identifies redox vulnerabilities for KEAP1/NRF2 mutant non-small cell lung cancer

Jiang, C.·Ward, N. P.·Prieto-Farigua, N.·Kang, Y. P.·Thalakola, A.·Teng, M.·DeNicola, G. M.
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Abstract

The redox regulator NRF2 is hyperactivated in a large percentage of non-small cell lung cancer (NSCLC) cases, which is associated with chemotherapy and radiation resistance. To identify redox vulnerabilities for KEAP1/NRF2 mutant NSCLC, we conducted a CRISPR-Cas9-based negative selection screen for antioxidant enzyme genes whose loss sensitized cells to sub-lethal concentrations of the superoxide (O2*-)-generating drug {beta}-Lapachone. While our screen identified expected hits in the pentose phosphate pathway, the thioredoxin-dependent antioxidant system, and glutathione reductase, we also identified the mitochondrial superoxide dismutase 2 (SOD2) as one of the top hits. Surprisingly, {beta}-Lapachone did not generate mitochondrial O2*- but rather SOD2 loss enhanced the efficacy of {beta}-Lapachone due to loss of iron-sulfur protein function, loss of mitochondrial ATP maintenance and deficient NADPH production. Importantly, inhibition of mitochondrial electron transport activity sensitized to {beta}-Lapachone, demonstrating these effects may be translated to increase ROS sensitivity therapeutically.

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Jiang, C., Ward, N. P., Prieto-Farigua, N., Kang, Y. P., Thalakola, A., Teng, M., DeNicola, G. M.. 2022-03-08. A CRISPR screen identifies redox vulnerabilities for KEAP1/NRF2 mutant non-small cell lung cancer. https://doi.org/10.1101/2022.03.08.483452

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