Study Identifies Cholesterol Biosynthesis as Key Driver of Chemotherapy-Resistant Cancer Cells
Researchers using tongue cancer organoids identified a subpopulation of cancer cells called cycling persisters that survive chemotherapy through elevated cholesterol biosynthesis controlled by the NR2F1 pathway. These cells proliferate even under drug exposure and are linked to tumor relapse. Blocking cholesterol biosynthesis with simvastatin suppressed these resistant cells, suggesting a potential therapeutic target.
Scientists tracked individual cancer cell clones in three-dimensional tongue cancer organoid cultures during and after chemotherapy exposure using time-lapse imaging. They discovered that cycling persisters—cells that continue growing despite drug treatment—showed distinct activation of the NR2F1-mediated cholesterol biosynthesis pathway, while simultaneously suppressing interferon signaling and hypoxic pathways compared to non-resistant cells. When researchers inhibited cholesterol biosynthesis using simvastatin, the emergence of cycling persister clones was significantly reduced. The findings suggest that variations in signaling pathway intensity at the individual cell level determine whether tumor cells survive chemotherapy, potentially explaining mechanisms of cancer relapse and identifying cholesterol biosynthesis as a therapeutic target.
Limitations & open questions
The study's limitations include its reliance on in vitro organoid models, which may not fully recapitulate the complexity of in vivo tumor microenvironments, drug metabolism, and immune interactions. The generalizability of findings across different cancer types beyond tongue cancer remains unclear. Clinical translation and efficacy in human patients have not been evaluated.
What different sources said
- bioRxivCenter
Cycling persister clones with elevated NR2F1-mediated cholesterol biosynthesis cause chemotherapy resistance
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