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Updated: Jul 16, 2025

Establishment of Proliferative Tetraploid Cells from Nontransformed Human Fibroblasts
Published on: January 8, 2017
Mitosis exit followed by death in interphase prevents the development of polyploid giant cancer cells
Abstract:
Microtubule targeting agents ( MTAs ) are commonly prescribed to treat cancers and predominantly kill cancer cells in mitosis. Significantly, some MTA-treated cancer cells can escape death in mitosis and exit mitosis, and become malignant polyploid giant cancer cells ( PGCC ). Considering the low number of malignant cells undergoing mitosis in tumor tissue, killing these cells in interphase may represent a favored antitumor approach. We discovered that ST-401, a mild inhibitor of microtubule assembly, preferentially kills cancer cells in interphase as opposed to mitosis, and avoids the development of PGCC. Single cell RNA sequencing identified mRNA transcripts regulated by ST-401, including mRNAs involved in ribosome and mitochondrial functions. Accordingly, ST-401 induces an integrated stress response and promotes mitochondria fission accompanied by a reduction in energy metabolism. This cell response may underly death in interphase and avoid the development of PGCC.
Insights
A novel agent, ST-401, targets cancer cells in interphase, unlike traditional microtubule targeting agents (MTAs). This approach avoids the development of polyploid giant cancer cells (PGCCs) and offers a new cancer treatment strategy.
Area of Science:
- Oncology
- Cell Biology
- Molecular Biology
Background:
- Microtubule targeting agents (MTAs) are standard cancer therapies that primarily kill mitotic cancer cells.
- Some cancer cells survive MTA treatment by exiting mitosis and becoming polyploid giant cancer cells (PGCCs).
- Targeting interphase cancer cells offers a potential strategy to overcome resistance and avoid PGCC formation.
Conclusions:
- ST-401 represents a promising therapeutic agent that targets cancer cells in interphase.
- Its mechanism involves inducing cellular stress and altering metabolic functions, leading to cell death.
- ST-401 offers a potential strategy to overcome resistance associated with traditional MTAs and prevent PGCC development.
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