Biology subjects

Zakirova, K.

Publications and source records attributed to Zakirova, K..

2 recordsLinked to original sources

bioRxiv2026

WNT8B and -9B promote the survival and dissemination of dormant ovarian cancer cells

Cancer cell dormancy and the resultant resistance to conventional therapies present significant challenges for the successful treatment of high-grade serous ovarian cancer (HGSC). We used genome wide, and specialized sgRNA, libraries in CRISPR-based screens to identify critical cell survival mechanisms in dormancy and metastasis. Our findings demonstrate that low expression Wnt ligands WNT8B and WNT9B are essential for sustaining cell survival during prolonged dormant spheroid culture conditions. These Wnt ligands utilize non-canonical signaling to activate expression of stem cell genes such as ALDH1A1, CD44 and others during spheroid dormancy. The loss of WNT8B and WNT9B reduced survival of xenografted ovarian cancer cells during early dissemination of disease that extended survival. Furthermore, treatment of WNT8B/9B deficient xenografts with carboplatin demonstrated increased sensitivity that further reduced dissemination and extended survival. These findings reveal that rare Wnt ligands can possess outsized functions in cancer pathogenesis and offer new avenues for improving treatment outcomes for HGSC through their inhibition.

cancer biology↗

bioRxiv2023

Netrin signaling mediates survival of dormant epithelial ovarian cancer cells

Dormancy in cancer is a clinical state in which residual disease remains undetectable for a prolonged duration. At a cellular level, rare cancer cells cease proliferation and survive chemotherapy and disseminate disease. We created a suspension culture model of high grade serous ovarian cancer (HGSOC) dormancy and devised a novel CRISPR screening approach to identify survival genes in this context. In combination with RNA-seq, we discovered the Netrin signaling pathway as critical to dormant HGSOC cell survival. We demonstrate that Netrin-1, -3, and its receptors are essential for low level ERK activation to promote survival, and that Netrin activation of ERK is unable to induce proliferation. Deletion of all UNC5 family receptors blocks Netrin signaling in HGSOC cells and compromises viability during the dormancy step of dissemination in xenograft assays. Furthermore, we demonstrate that Netrin-1 and -3 overexpression in HGSOC correlates with poor outcome. Specifically, our experiments reveal that Netrin overexpression elevates cell survival in dormant culture conditions and contributes to greater spread of disease in a xenograft model of abdominal dissemination. This study highlights Netrin signaling as a key mediator HGSOC cancer cell dormancy and metastasis.

cancer biology↗