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Ablation of p57+ Quiescent Cancer Stem Cells Suppresses Recurrence After Chemotherapy of Intestinal Tumors.
Cancer Research 2023 March 8
Quiescent cancer stem cells (CSCs) are resistant to conventional anti-cancer treatments and have been shown to contribute to disease relapse after therapy in some cancer types. The identification and characterization of quiescent CSCs could facilitate the development of strategies to target this cell population and block recurrence. Here, we established a syngeneic orthotopic transplantation model in mice based on intestinal cancer organoids to profile quiescent CSCs. Single-cell transcriptomic analysis of the primary tumors formed in vivo revealed that conventional Lgr5high intestinal CSCs comprise both actively and slowly cycling subpopulations, the latter of which specifically expresses the cyclin-dependent kinase inhibitor p57. Tumorigenicity assays and lineage tracing experiments showed that the quiescent p57+ CSCs contribute in only a limited manner to steady-state tumor growth but they are chemotherapy resistant and drive post-therapeutic cancer recurrence. Ablation of p57+ CSCs suppressed intestinal tumor regrowth after chemotherapy. Together, these results shed light on the heterogeneity of intestinal CSCs and reveal p57+ CSCs as a promising therapeutic target for malignant intestinal cancer.
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