Cited by 435Autophagy in Disease and TherapyCancer, Hypoxia, and MetabolismMetabolism, Diabetes, and Cancer

Autophagy Sustains Mitochondrial Glutamine Metabolism and Growth of Braf V600E–Driven Lung Tumors

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Strohecker, Anne M., Guo, Jessie Yanxiang, Karsli-Uzunbas, Gizem, Price, Sandy M., Chen, Guanghua Jim, Mathew, Robin, McMahon, Martin, White, Eileen·2013·Cancer Discovery

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Abstract

UNLABELLED: Autophagic elimination of defective mitochondria suppresses oxidative stress and preserves mitochondrial function. Here, the essential autophagy gene Atg7 was deleted in a mouse model of BrafV600E-induced lung cancer in the presence or absence of the tumor suppressor Trp53. Atg7 deletion initially induced oxidative stress and accelerated tumor cell proliferation in a manner indistinguishable from Nrf2 ablation. Compound deletion of Atg7 and Nrf2 had no additive effect, suggesting that both genes modulate tumorigenesis by regulating oxidative stress and revealing a potential mechanism of autophagy-mediated tumor suppression. At later stages of tumorigenesis, Atg7 deficiency resulted in an accumulation of defective mitochondria, proliferative defects, reduced tumor burden, conversion of adenomas and adenocarcinomas to oncocytomas, and increased mouse life span. Autophagy-defective tumor-derived cell lines were impaired in their ability to respire and survive starvation and were glutamine-dependent, suggesting that autophagy-supplied substrates from protein degradation sustains BrafV600E tumor growth and metabolism. SIGNIFICANCE: The essential autophagy gene Atg7 functions to promote BrafV600E-driven lung tumorigenesis by preserving mitochondrial glutamine metabolism. This suggests that inhibiting autophagy is a novel approach to treating BrafV600E-driven cancers.

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  • Deletion of Atg7 changes lung tumors driven by KrasG12D and BrafV600E from malignant adenocarcinomas to benign oncocytomas.

    “deletion of a core component of the autophagy machinery, Atg7, was shown to dramatically change the nature of lung tumors driven by KrasG12D and BrafV600E oncogenes from malignant adenocarcinomas to benign oncocytomas”

    From The emerging hallmarks of cancer metabolism (2016) · cites this paper as Strohecker et al., 2013

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Authors
Strohecker, A. M., Guo, J. Y., Karsli-Uzunbas, G., Price, S. M., Chen, G. J., Mathew, R., McMahon, M., & White, E.
Affiliations
Rutgers, The State University of New Jersey (US)
Corresponding author
White, Eileen
Venue
Cancer Discovery
Published
2013-11-01
Volume
3
Issue
11
Pages
1272-1285
ISSN
  • 2159-8274 (ISSN-L)
  • 2159-8290
OpenAlex
W2125231982
Cited by
435
References
36
Citations by year
2026: 15 · 2025: 24 · 2024: 21 · 2023: 27 · 2022: 39 · 2021: 56 · 2020: 38 · 2019: 41 · 2018: 33 · 2017: 30 · 2016: 39 · 2015: 36 · 2014: 30 · 2013: 5
FWCI
26.77
Type
journal article
Language
en
Open access
Locations
  • Cancer Discovery (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • American Association for Cancer Research
  • Rutgers Cancer Institute of New Jersey
  • University of California, San Francisco
  • National Cancer Institute (R37CA053370, R37-CA53370, RCI CA147961, RC1CA147961, CA131261, R01CA130893, P30CA072720, R01CA131261, R01CA163591)
Topics
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Cancer, Hypoxia, and Metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
Keywords
autophagy, ATG7, BRAF V600E mutation, lung cancer, oxidative stress, Nrf2, Trp53, tumor growth, glutamine addiction, autophagy inhibition, tumor suppressor function
MeSH terms
Autophagy-Related Protein 7, Adenocarcinoma, Adenoma, Animals, Autophagy, Cell Transformation, Neoplastic, Disease Models, Animal, Glutamine, Humans, Lung Neoplasms, Microtubule-Associated Proteins, Mitochondria, Gene Expression Regulation, Neoplastic, Tumor Suppressor Protein p53, Gene Deletion, Adenoma, Oxyphilic, Oxidative Stress, Cell Line, Tumor, Proto-Oncogene Proteins B-raf, NF-E2-Related Factor 2, Mice

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