Cited by 81MicroRNA in disease regulationCancer, Hypoxia, and MetabolismCancer-related molecular mechanisms research

Hypoxia-induced miR-424 decreases tumor sensitivity to chemotherapy by inhibiting apoptosis

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Zhang, D, Shi, Z, Li, M, Mi, J·2014·Cell Death & Disease

Abstract

Chemotherapy resistance of tumor cells is a big challenge. Adaption to hypoxia is an essential cellular response that is controlled by the master oxygen-sensitive transcription factor HIF1 (hypoxia-inducible factor 1). The mechanism by which tumor cells acquire resistance to chemotherapy under hypoxic conditions is not fully understood. In this study, we found that hypoxia induces miR-424 expression and that miR-424 in turn suppresses the level of PDCD4 protein, a tumor suppressor that is involved in apoptosis, by targeting its 3' untranslated region. Functionally, miR-424 overexpression decreases the sensitivity of cancer cells (HCT116 and A375) to doxorubicin (Dox) and etoposide. In contrast, the inhibition of miR-424 enhanced apoptosis and increased the sensitivity of cancer cells to Dox. In a xenograft tumor model, miR-424 overexpression promoted tumor growth following Dox treatment, suggesting that miR-424 promotes tumor cell resistance to Dox. Furthermore, miR-424 levels are inversely correlated with PDCD4 expression in clinical breast cancer samples. These results suggest that miR-424 is a potential molecular target for tumor therapy.

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Crossref · 10.1038/cddis.2014.240

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  • Inhibition of HIF-1α could overcome resistance of tumor cells to chemotherapy.

    “Numerous reports demonstrated that inhibition of HIF-1α could overcome resistance of tumor cells to chemotherapy [25, 26].”

    From Inhibition of HIF-1α by PX-478 enhances the anti-tumor effect of gemcitabine by inducing immunogenic cell death in pancreatic ductal adenocarcinoma (2015) · cites this paper as [26]

    The Discussion (page not available in our copy) reports that HIF1α regulates miR-424 expression and that hypoxia-induced miR-424 contributes to chemotherapy resistance. The paper reports increased sensitivity to doxorubicin after inhibiting miR-424, not after inhibiting HIF1α; it therefore supports the proposed pathway but not the specific intervention attributed to it. (LLM, conf=0.82)

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Authors
Zhang, D., Shi, Z., Li, M., & Mi, J.
Affiliations
  • Shanghai Jiao Tong University (CN)
  • Dalian Medical University (CN)
Corresponding author
  • Li, M
  • Mi, J
Venue
Cell Death & Disease
Published
2014-06-26
Volume
5
Issue
6
Pages
e1301-e1301
ISSN
2041-4889 (ISSN-L)
OpenAlex
W1997934991
Cited by
81
References
18
Citations by year
2026: 2 · 2025: 1 · 2024: 6 · 2023: 2 · 2022: 6 · 2021: 7 · 2020: 13 · 2019: 8 · 2018: 11 · 2017: 6 · 2016: 8 · 2015: 9 · 2014: 2
FWCI
2.67
Type
journal article
Language
en
Open access
Locations
  • Cell Death and Disease (publishedVersion, cc-by-nc-sa)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by-nc-sa)
  • PubMed Central (publishedVersion, cc-by-nc-sa)
  • PubMed (publishedVersion)
Funders
  • National Natural Science Foundation of China (973 Program, 81372194)
  • National Key Research and Development Program of China (2012CB910102)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › MicroRNA in disease regulation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Cancer, Hypoxia, and Metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Cancer-related molecular mechanisms research
Keywords
miR-424, PDCD4, tumor hypoxia, chemoresistance, doxorubicin, apoptosis, HIF-1, microRNA, 3' untranslated region, breast cancer, xenograft tumor growth, etoposide
MeSH terms
Animals, Antibiotics, Antineoplastic, Antineoplastic Agents, Phytogenic, Doxorubicin, Etoposide, Humans, Mice, Nude, Neoplasms, RNA, Neoplasm, Cell Hypoxia, Apoptosis, Drug Resistance, Neoplasm, MicroRNAs, Cell Line, Tumor, Mice

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