Prooxidative Activity of Celastrol Induces Apoptosis, DNA Damage, and Cell Cycle Arrest in Drug-Resistant Human Colon Cancer Cells
Open accessAbstract
Cancer resistance to chemotherapy is closely related to tumor heterogeneity, i.e., the existence of distinct subpopulations of cancer cells in a tumor mass. An important role is assigned to cancer stem cells (CSCs), a small subset of cancer cells with high tumorigenic potential and capacity of self-renewal and differentiation. These properties of CSCs are sustained by the ability of those cells to maintain a low intracellular reactive oxygen species (ROS) levels, via upregulation of ROS scavenging systems. However, the accumulation of ROS over a critical threshold disturbs CSCs—redox homeostasis causing severe cytotoxic consequences. In the present study, we investigated the capacity of celastrol, a natural pentacyclic triterpenoid, to induce the formation of ROS and, consequently, cell death of the colon cancer cells with acquired resistant to cytotoxic drugs (LOVO/DX cell line). LOVO/DX cells express several important stem-like cell features, including a higher frequency of side population (SP) cells, higher expression of multidrug resistant proteins, overexpression of CSC-specific cell surface marker (CD44), increased expression of DNA repair gene (PARP1), and low intracellular ROS level. We found that celastrol, at higher concentrations (above 1 μ M), significantly increased ROS amount in LOVO/DX cells at both cytoplasmic and mitochondrial levels. This prooxidant activity was associated with the induction of DNA double-strand breaks (DSBs) and apoptotic/necrotic cell death, as well as with inhibition of cell proliferation by S phase cell cycle arrest. Coincubation with NAC, a ROS scavenger, completely reversed the above effects. In summary, our results provide evidence that celastrol exhibits effective cytotoxic effects via ROS-dependent mechanisms on drug-resistant colon cancer cells. These findings strongly suggest the potential of celastrol to effectively kill cancer stem-like cells, and thus, it is a promising agent to treat severe, resistant to conventional therapy, colon cancers.
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ROS induces cell death, cell senescence, repair failure, inhibition of cell proliferation, and cell cycle arrest.
“Furthermore, ROS induces cell death11, cell senescence, repair failure12, inhibition of cell proliferation, and cell cycle arrest13.”
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- Authors
- Moreira, H., Szyjka, A., Paliszkiewicz, K., & Barg, E.
- Affiliations
- Wroclaw Medical University (PL)
- Corresponding author
- Moreira, Helena
- Venue
- Oxidative Medicine and Cellular Longevity
- Publisher
- Wiley
- Published
- 2019-08-14
- Volume
- 2019
- Pages
- 1-12
- ISSN
- 1942-0994 (ISSN-L)
- 1942-0900
- PMC
- PMC6710751
- OpenAlex
- W2968267298
- Cited by
- 55
- References
- 41
- Citations by year
- 2026: 3 · 2025: 7 · 2024: 11 · 2023: 9 · 2022: 6 · 2021: 12 · 2020: 6 · 2019: 1
- FWCI
- 8.06
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Locations
- Oxidative Medicine and Cellular Longevity (publishedVersion, cc-by)
- Europe PMC (PubMed Central) (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
- Funders
- Wroclaw Medical University (ST.D130.16.009)
- Topics
- Health Sciences › Medicine › Complementary and alternative medicine › Natural Compounds in Disease Treatment
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Natural product bioactivities and synthesis
- Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Toxicology › Bioactive Compounds and Antitumor Agents
- Keywords
- celastrol, pentacyclic triterpenes, colon cancer, chemoresistance, cancer stem cells, reactive oxygen species, pro-oxidant activity, apoptosis, DNA double-strand breaks, cell cycle arrest, S phase arrest, side population cells, CD44, multidrug resistance protein, PARP1, N-acetylcysteine
- MeSH terms
- Colonic Neoplasms, DNA Damage, Humans, Triterpenes, Apoptosis, Tripterygium, Pentacyclic Triterpenes, Cell Cycle Checkpoints
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