Cited by 97Cell death mechanisms and regulationAutophagy in Disease and TherapyUbiquitin and proteasome pathways

Inhibition of BMI1 induces autophagy-mediated necroptosis

Open access
Dey, Anindya, Mustafi, Soumyajit Banerjee, Saha, Sounik, Kumar Dhar Dwivedi, Shailendra, Mukherjee, Priyabrata, Bhattacharya, Resham·2016·Autophagy

Abstract

The clonal self-renewal property conferred by BMI1 is instrumental in maintenance of not only normal stem cells but also cancer-initiating cells from several different malignancies that represent a major challenge to chemotherapy. Realizing the immense pathological significance, PTC-209, a small molecule inhibitor of BMI1 transcription has recently been described. While targeting BMI1 in various systems significantly decreases clonal growth, the mechanisms differ, are context-dependent, and somewhat unclear. We report here that genetic or pharmacological inhibition of BMI1 significantly impacts clonal growth without altering CDKN2A/INK4/ARF or CCNG2 and induces autophagy in ovarian cancer (OvCa) cells through ATP depletion. While autophagy can promote survival or induce cell death, targeting BMI1 engages the PINK1-PARK2-dependent mitochondrial pathway and induces a novel mode of nonapoptotic, necroptosis-mediated cell death. In OvCa, necroptosis is potentiated by activation of the RIPK1-RIPK3 complex that phosphorylates its downstream substrate, MLKL. Importantly, genetic or pharmacological inhibitors of autophagy or RIPK3 rescue clonal growth in BMI1 depleted cells. Thus, we have established a novel molecular link between BMI1, clonal growth, autophagy and necroptosis. In chemoresistant OvCa where apoptotic pathways are frequently impaired, necroptotic cell death modalities provide an important alternate strategy that leverage overexpression of BMI1.

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Authors
Dey, A., Mustafi, S. B., Saha, S., Kumar Dhar Dwivedi, S., Mukherjee, P., & Bhattacharya, R.
Affiliations
  • University of Oklahoma Medical Center (US)
  • OU Health Stephenson Cancer Center (US)
Corresponding author
Bhattacharya, Resham
Venue
Autophagy
Published
2016-04-02
Volume
12
Issue
4
Pages
659-670
ISSN
  • 1554-8627 (ISSN-L)
  • 1554-8635
OpenAlex
W2313960655
Cited by
97
References
60
Citations by year
2026: 6 · 2025: 2 · 2024: 17 · 2023: 12 · 2022: 14 · 2021: 15 · 2020: 7 · 2019: 9 · 2018: 6 · 2017: 7 · 2016: 2
FWCI
4.16
Type
journal article
Language
en
Open access
Locations
  • Autophagy (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health
  • National Cancer Institute (R01CA157481, CA157481)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
Keywords
BMI1, PTC-209, necroptosis, ovarian cancer, clonal growth, mitochondrial pathway, MLKL, chemoresistance, ATP depletion, cancer stem cells, non-apoptotic cell death
MeSH terms
Adenosine Triphosphate, Autophagy, Heterocyclic Compounds, 2-Ring, Humans, Mitochondria, Models, Biological, Necrosis, Thiazoles, Apoptosis, Caspases, Cell Line, Tumor, Polycomb Repressive Complex 1

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