Frizzled-7 Identifies Platinum-Tolerant Ovarian Cancer Cells Susceptible to Ferroptosis.

Published on Jan 15, 2021in Cancer Research9.727
· DOI :10.1158/0008-5472.CAN-20-1488
Yinu Wang8
Estimated H-index: 8
(NU: Northwestern University),
Yinu Wang4
Estimated H-index: 4
(NU: Northwestern University)
+ 11 AuthorsDaniela Matei59
Estimated H-index: 59
(NU: Northwestern University)
Defining traits of platinum-tolerant cancer cells could expose new treatment vulnerabilities. Here, new markers associated with platinum-tolerant cells and tumors were identified using in vitro and in vivo ovarian cancer (OC) models treated repetitively with carboplatin and validated in human specimens. Platinum-tolerant cells and tumors were enriched in ALDH (+) cells, formed more spheroids, and expressed increased levels of stemness-related transcription factors compared to parental cells. Additionally, platinum-tolerant cells and tumors exhibited expression of the Wnt receptor Frizzled 7 (FZD7). Knockdown of FZD7 improved sensitivity to platinum, decreased spheroid formation, and delayed tumor initiation. The molecular signature distinguishing FZD7(+) from FZD7(-) cells included epithelial-to-mesenchymal (EMT), stemness, and oxidative phosphorylation-enriched gene sets. Overexpression of FZD7 activated the oncogenic factor Tp63, driving upregulation of glutathione metabolism pathways, including glutathione peroxidase 4 (GPX4), which protected cells from chemotherapy-induced oxidative stress. FZD7(+) platinum-tolerant OC cells were more sensitive and underwent ferroptosis after treatment with GPX4 inhibitors. FZD7, Tp63, and glutathione metabolism gene sets were strongly correlated in the OC Tumor Cancer Genome Atlas (TCGA) database and in human OC specimens residual after chemotherapy. These results support the existence of a platinum-tolerant cell population with partial stem cell features, characterized by FZD7 expression and dependent on FZD7-β-catenin-Tp63-GPX4 pathway for survival. These findings reveal a novel therapeutic vulnerability of platinum-tolerant cancer cells and provide new insight into a potential "persister cancer cell" phenotype.
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