Concurrent loss of LKB1 and KEAP1 enhances SHMT-mediated antioxidant defence in KRAS-mutant lung cancer

Hyun Min Lee, Nefertiti Muhammad, Elizabeth L. Lieu, Feng Cai, Jiawei Mu, Yun Sok Ha, Guoshen Cao, Chamey Suchors, Kenneth Joves, Constantinos Chronis, Kailong Li, Gregory S. Ducker, Kellen Olszewski, Ling Cai, Derek B. Allison, Sara E. Bachert, William R. Ewing, Harvey Wong, Hyosun Seo, Isaac Y. KimBrandon Faubert, James Kim, Jiyeon Kim

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Non-small-cell lung cancer (NSCLC) with concurrent mutations in KRAS and the tumour suppressor LKB1 (KL NSCLC) is refractory to most therapies and has one of the worst predicted outcomes. Here we describe a KL-induced metabolic vulnerability associated with serine–glycine-one-carbon (SGOC) metabolism. Using RNA-seq and metabolomics data from human NSCLC, we uncovered that LKB1 loss enhanced SGOC metabolism via serine hydroxymethyltransferase (SHMT). LKB1 loss, in collaboration with KEAP1 loss, activated SHMT through inactivation of the salt-induced kinase (SIK)–NRF2 axis and satisfied the increased demand for one-carbon units necessary for antioxidant defence. Chemical and genetic SHMT suppression increased cellular sensitivity to oxidative stress and cell death. Further, the SHMT inhibitor enhanced the in vivo therapeutic efficacy of paclitaxel (first-line NSCLC therapy inducing oxidative stress) in KEAP1-mutant KL tumours. The data reveal how this highly aggressive molecular subtype of NSCLC fulfills their metabolic requirements and provides insight into therapeutic strategies.

Original languageEnglish (US)
Pages (from-to)1310-1328
Number of pages19
JournalNature Metabolism
Volume6
Issue number7
DOIs
StatePublished - Jul 2024
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Internal Medicine
  • Endocrinology, Diabetes and Metabolism
  • Physiology (medical)
  • Cell Biology

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