Cited by 1,527Epigenetics and DNA Methylationinterferon and immune responsesImmunotherapy and Immune Responses

DNA-Demethylating Agents Target Colorectal Cancer Cells by Inducing Viral Mimicry by Endogenous Transcripts

Open access
Roulois, David, Loo Yau, Helen, Singhania, Rajat, Wang, Yadong, Danesh, Arnavaz, Shen, Shu Yi, Han, Han, Liang, Gangning +4 more·2015·Cell

Abstract

DNA-demethylating agents have shown clinical anti-tumor efficacy via an unknown mechanism of action. Using a combination of experimental and bioinformatics analyses in colorectal cancer cells, we demonstrate that low-dose 5-AZA-CdR targets colorectal cancer-initiating cells (CICs) by inducing viral mimicry. This is associated with induction of dsRNAs derived at least in part from endogenous retroviral elements, activation of the MDA5/MAVS RNA recognition pathway, and downstream activation of IRF7. Indeed, disruption of virus recognition pathways, by individually knocking down MDA5, MAVS, or IRF7, inhibits the ability of 5-AZA-CdR to target colorectal CICs and significantly decreases 5-AZA-CdR long-term growth effects. Moreover, transfection of dsRNA into CICs can mimic the effects of 5-AZA-CdR. Together, our results represent a major shift in understanding the anti-tumor mechanisms of DNA-demethylating agents and highlight the MDA5/MAVS/IRF7 pathway as a potentially druggable target against CICs.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1016/j.cell.2015.07.056

Cites

39 of 39 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

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?

  • The IFN-I response could expose tumor cells to surveillance by the immune system.

    “The IFN-I response could also expose the tumor cells to surveillance by the immune system96, 97.”

    From The role of retrotransposable elements in ageing and age-associated diseases (2021) · cites this paper as [96]

    The Results section reports that 5-AZA-CdR induced type III, but not type I, interferons in the colorectal cancer cells studied. The Discussion describes tumor-cell immunogenic death through RIG1/MDA5 signaling, but says that antitumor effect appears independent of type I interferon; it does not attribute immune exposure to an IFN-I response. Page numbers are not available in our copy. (LLM, conf=0.82)

    Checked by a reasoning model — may be wrong.

    Experimental — accuracy not yet measured
  • DAC treatment could induce expression of retrotransposons normally silenced by DNA methylation, which could augment tumor immunogenicity.

    “DAC treatment could induce expression of retrotransposons normally silenced by DNA methylation, which could also augment tumor immunogenicity10–14,99.”
  • Inactivated typical enhancers in HCC are associated with collagen fibril organization and chemotaxis GO terms and enriched for binding motifs of immune-related TFs, including STAT1.

    “inactivated typical enhancers were associated with collagen fibril organization and chemotaxis GO terms and were enriched for binding motifs of immune-related TFs, including STAT1 (Fig. 2a, b)12,13.”

    From Multi-omic analysis of hepatocellular carcinoma reveals aberrant cis-regulatory changes and dysregulated retrotransposons with prognostic potential (2025) · cites this paper as [13]

    The Results section discusses interferon-responsive signaling and STAT1 in colorectal cancer cell experiments, not inactivated enhancers in HCC. Searches for collagen fibril organization, chemotaxis, and enhancer-binding motifs found no passage addressing those claims in our copy; page numbers were not provided. (LLM, conf=0.75)

    Experimental — accuracy not yet measured
  • In other tumours, DNA demethylating agents can have the opposite effect.

    “For instance, in Hodgkin lymphoma, transcription of the IRF5 transcription factor gene is induced by DNA hypomethylation of a normally dormant endogenous retroviral long terminal repeat located upstream of the promoter, a phenomenon dubbed onco-exaptation 146 , whereas in other tumours, DNA demethylating agents can have the opposite effect 147 .”
  • Depletion of YTHDF1 enhances cross-presentation of tumour antigens by dendritic cells.

    “Depletion of YTHDF1 (YTH N6-methyladenosine binding protein 1), which binds m6A-modified mRNA, enhanced cross-presentation of tumour antigens by dendritic cells.”

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

1 retracted

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Roulois, D., Loo Yau, H., Singhania, R., Wang, Y., Danesh, A., Shen, S. Y., Han, H., Liang, G., Jones, P. A., Pugh, T. J., O’Brien, C., & De Carvalho, D. D.
Affiliations
  • University Health Network (CA)
  • University of Southern California (US)
Venue
Cell
Publisher
Elsevier BV
Published
2015-08
Volume
162
Issue
5
Pages
961-973
ISSN
0092-8674 (ISSN-L)
OpenAlex
W1905278501
Cited by
1,527
References
39
Citations by year
2026: 145 · 2025: 148 · 2024: 179 · 2023: 165 · 2022: 162 · 2021: 181 · 2020: 124 · 2019: 124 · 2018: 119 · 2017: 100 · 2016: 72 · 2015: 7
FWCI
42.87
Type
journal article
Language
en
Open access
Locations
  • Cell (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
National Cancer Institute (R01CA170550, R01CA082422)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Epigenetics and DNA Methylation
  • Life Sciences › Immunology and Microbiology › Immunology › interferon and immune responses
  • Life Sciences › Immunology and Microbiology › Immunology › Immunotherapy and Immune Responses
Keywords
hypomethylating agents, azacitidine, colorectal cancer, cancer stem cells, viral mimicry, endogenous retroviruses, double-stranded RNA, MDA5, MAVS, IRF7, innate antiviral signaling
MeSH terms
Interferon-Induced Helicase, IFIH1, Decitabine, Animals, Antimetabolites, Antineoplastic, Azacitidine, Cells, Cultured, Humans, RNA, Double-Stranded, Colorectal Neoplasms, Signal Transduction, Receptors, Retinoic Acid, DNA Methylation, Endogenous Retroviruses, Adaptor Proteins, Signal Transducing, Interferon Regulatory Factor-7, Mice, DEAD-box RNA Helicases

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