Cited by 839Genomics, phytochemicals, and oxidative stressDrug Transport and Resistance MechanismsBioactive Compounds and Antitumor Agents

Nrf2 enhances resistance of cancer cells to chemotherapeutic drugs, the dark side of Nrf2

Open access
Wang, X.-J., Sun, Z., Villeneuve, N. F., Zhang, S., Zhao, F., Li, Y., Chen, W., Yi, X. +4 more·2008·Carcinogenesis

Abstract

Drug resistance during chemotherapy is the major obstacle to the successful treatment of many cancers. Here, we report that inhibition of NF-E2-related factor 2 (Nrf2) may be a promising strategy to combat chemoresistance. Nrf2 is a critical transcription factor regulating a cellular protective response that defends cells against toxic insults from a broad spectrum of chemicals. Under normal conditions, the low constitutive amount of Nrf2 protein is maintained by the Kelch-like ECH-associated protein1 (Keap1)-mediated ubiquitination and proteasomal degradation system. Upon activation, this Keap1-dependent Nrf2 degradation mechanism is quickly inactivated, resulting in accumulation and activation of the antioxidant response element (ARE)-dependent cytoprotective genes. Since its discovery, Nrf2 has been viewed as a 'good' transcription factor that protects us from many diseases. In this study, we demonstrate the dark side of Nrf2: stable overexpression of Nrf2 resulted in enhanced resistance of cancer cells to chemotherapeutic agents including cisplatin, doxorubicin and etoposide. Inversely, downregulation of the Nrf2-dependent response by overexpression of Keap1 or transient transfection of Nrf2-small interfering RNA (siRNA) rendered cancer cells more susceptible to these drugs. Upregulation of Nrf2 by the small chemical tert-butylhydroquinone (tBHQ) also enhanced the resistance of cancer cells, indicating the feasibility of using small chemical inhibitors of Nrf2 as adjuvants to chemotherapy to increase the efficacy of chemotherapeutic agents. Furthermore, we provide evidence that the strategy of using Nrf2 inhibitors to increase efficacy of chemotherapeutic agents is not limited to certain cancer types or anticancer drugs and thus can be applied during the course of chemotherapy to treat many cancer types.

Integrity signals

Registry

Crossref · 10.1093/carcin/bgn095

Cites

57 of 57 references verified0 citation errors · 0 not checkable

Statistics

Recomputing p-values needs the paper’s full text.

Claims the paper makes

We couldn’t retrieve this paper’s full text, so its claims and self-check weren’t run. The registry and citation checks still apply.

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • Some somatic mutations give rise to hyperactive Nrf2, which causes enhanced antioxidant capacity and confers protection of cancer cells from ROS and cancer therapy, leading to cancer cell growth and proliferation, cancer progression, and cancer therapy resistance.

    “Some somatic mutations give rise to hyperactive Nrf2, which causes enhanced antioxidant capacity and confers protection of cancer cells from ROS and cancer therapy, thereby leading to cancer cell growth and proliferation, cancer progression, and cancer therapy resistance (e.g., chemoresistance) (Figure 8) [161,162,163,164,165,166,167,168,169,170,171].”
  • Upregulation of Nrf2-mediated antioxidant proteins renders cancer cells resistant to chemotherapeutic drugs (e.g., cisplatin, 5-fluorouracil, docetaxel, and bortezomib) and radiotherapy.

    “The resultant upregulation of Nrf2-mediated antioxidant proteins renders cancer cells resistant to chemotherapeutic drugs (e.g., cisplatin, 5-fluorouracil, docetaxel, and bortezomib) and radiotherapy [47,161,165,178,179,180,181,182,183,184].”

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Wang, X.-J., Sun, Z., Villeneuve, N. F., Zhang, S., Zhao, F., Li, Y., Chen, W., Yi, X., Zheng, W., Wondrak, G. T., Wong, P. K., & Zhang, D. D.
Affiliations
University of Arizona (US)
Corresponding author
Zhang, D. D.
Venue
Carcinogenesis
Published
2008-04-15
Volume
29
Issue
6
Pages
1235-1243
ISSN
  • 0143-3334 (ISSN-L)
  • 1460-2180
OpenAlex
W2104718696
Cited by
839
References
57
Citations by year
2026: 30 · 2025: 39 · 2024: 66 · 2023: 47 · 2022: 57 · 2021: 62 · 2020: 61 · 2019: 53 · 2018: 45 · 2017: 63 · 2016: 54 · 2015: 58 · 2014: 50 · 2013: 46 · 2012: 37
FWCI
9.73
Type
journal article
Language
en
Open access
Locations
  • Carcinogenesis (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Institute of Environmental Health Sciences (R01ES015010, ES 015010-01, T32ES007091, P30ES006694)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics, phytochemicals, and oxidative stress
  • Health Sciences › Medicine › Oncology › Drug Transport and Resistance Mechanisms
  • Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Toxicology › Bioactive Compounds and Antitumor Agents
Keywords
Nrf2, chemoresistance, Keap1, cisplatin, doxorubicin, etoposide, tert-butylhydroquinone, Nrf2 inhibitors, antioxidant response element, cancer chemotherapy, siRNA knockdown
MeSH terms
Kelch-Like ECH-Associated Protein 1, Antineoplastic Agents, Humans, Neoplasms, RNA, Messenger, Transfection, Immunoblotting, Gene Expression, Drug Resistance, Neoplasm, Reverse Transcriptase Polymerase Chain Reaction, RNA, Small Interfering, Cell Line, Tumor, Intracellular Signaling Peptides and Proteins, NF-E2-Related Factor 2

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review