Cited by 51Metabolism, Diabetes, and CancerPI3K/AKT/mTOR signaling in cancerCancer, Hypoxia, and Metabolism

Anti-tumor Effects of Everolimus and Metformin Are Complementary and Glucose-dependent in Breast Cancer Cells

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Ariaans, Gerke, Jalving, Mathilde, Vries, Emma Geertruida Elisabeth de, Jong, Steven de·2017·BMC Cancer

Abstract

Clinical efficacy of the mTOR inhibitor everolimus is limited in breast cancer and regularly leads to side-effects including hyperglycemia. The AMPK inhibitor and anti-diabetic drug metformin may counteract everolimus-induced hyperglycemia, as well as enhancing anti-cancer efficacy. We investigated the glucose-dependent growth-inhibitory properties of everolimus, metformin and the combination in breast cancer cell lines. The breast cancer cell lines MCF-7, MDA-MB-231 and T47D were cultured in media containing 11 mM or 2.75 mM glucose with 21% or 1% oxygen. Everolimus and metformin treated cells were subjected to cytotoxicity and clonogenic assays, western blotting, FACS and metabolic measurements. Everolimus was less effective in MCF7 cells under low glucose conditions compared to high glucose conditions (IC 50 of >50 nM vs 29.1 ± 1.4 nM) in a short-term survival assay, while sensitivity of MDA-MB-231 and T47D cells to everolimus was lost under low glucose conditions. In contrast, metformin was more effective in low than in high glucose conditions in MCF7 (IC 50 of 1.8 ± 1.2 mM vs >5 mM) and MDA-MB231 cells (1.5 ± 1.3 mM vs 2.6 ± 1.2 mM). Metformin sensitivity of T47D cells was independent of glucose concentrations. Everolimus combined with metformin additively inhibited cell survival, clonogenicity, mTOR signaling activity and mitochondrial respiration. These effects were not the result of enhanced autophagy or apoptosis induction. Similar results were observed under hypoxic conditions. Metformin-induced effects are additive to the anti-proliferative and colony inhibitory properties of everolimus through inhibition of mitochondrial respiration and mTOR signaling. These results warrant further in vivo investigation of everolimus combined with metformin as a putative anti-cancer therapy.

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  • mTOR inhibitors could inhibit tumor progression as having a complex modifying role on metabolism.

    “mTOR inhibitors could inhibit tumor progression as having a complex modifying role on metabolism [108–113].”

    From Hypoxia Signaling in Cancer: From Basics to Clinical Practice (2021) · cites this paper as [113]

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Authors
Ariaans, G., Jalving, M., Vries, E. G. E. D., & Jong, S. D.
Affiliations
University Medical Center Groningen (NL)
Corresponding author
Jong, Steven de
Venue
BMC Cancer
Published
2017-03-29
Volume
17
Issue
1
Pages
232-232
ISSN
1471-2407 (ISSN-L)
OpenAlex
W2600618192
Cited by
51
References
42
Citations by year
2026: 4 · 2025: 3 · 2024: 3 · 2023: 6 · 2022: 8 · 2021: 9 · 2020: 8 · 2019: 6 · 2018: 2 · 2017: 2
FWCI
2.01
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • BMC Cancer (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • University of Groningen research database (University of Groningen / Centre for Information Technology) (submittedVersion, cc-by)
Funders
Koninklijke Nederlandse Akademie van Wetenschappen
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Cancer, Hypoxia, and Metabolism
Keywords
everolimus, metformin, breast cancer, mTOR inhibition, AMPK inhibition, glucose dependence, hypoxia, mitochondrial respiration, combination therapy, hyperglycemia, cell proliferation, clonogenicity, autophagy, apoptosis
MeSH terms
Everolimus, Antineoplastic Agents, Breast Neoplasms, Cell Survival, Female, Glucose, Glycolysis, Humans, Metformin, Cell Hypoxia, Cell Line, Tumor

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