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Targeting the Wnt/β-catenin pathway in primary ovarian cancer with the porcupine inhibitor WNT974

Boone, Jonathan and Cooper, Sara and Johnston, Bobby and Arend, Rebecca and Gilchrest, Austin and Oelschlager, Denise and Grizzle, William and McGwin, Gerald and Gangrade, Abhishek and Straughn, J. Michael and Buchsbaum, Donald (2015) Targeting the Wnt/β-catenin pathway in primary ovarian cancer with the porcupine inhibitor WNT974. Laboratory Investigation.

Abstract

Objectives: Preclinical studies in ovarian cancer have demonstrated upregulation of the Wnt/β-catenin pathway promoting tumor proliferation and chemoresistance. Our objective was to evaluate the effect of the Wnt/β-catenin pathway inhibitor, WNT974, in primary ovarian cancer ascites cells.
Methods: Ascites cells from patients with papillary serous ovarian cancer were isolated and treated with 1 μM WNT974 ± 100 μM carboplatin. Viability was evaluated with the ATP-lite assay. The IC50 was calculated using a dose-response analysis. Immunohistochemistry (IHC) was performed on ascites cells and tumor. Expression of RSPO2, RSPO3, PORCN and three previously characterized R-spondin (RSPO) fusion transcripts were assessed using Taqman assays.
Results: Sixty ascites samples were analyzed for response to WNT974. The ascites samples that showed a decrease in ATP concentration after treatment demonstrated no difference from the untreated cells in percent viability with trypan blue staining. Flow cytometry demonstrated fewer cells in the G2 phase and more in the G1 and S phases after treatment with WNT974. Combination therapy with WNT974 and carboplatin resulted in a higher percentage of samples that showed ≥ 30% reduction in ATP concentration than either single drug treatment. IHC analysis of Wnt pathway proteins suggests cell cycle arrest rather than cytotoxicity after WNT974 treatment. qPCR indicated that RSPO fusions are not prevalent in ovarian cancer tissues or ascites. However, higher PORCN expression correlated to sensitivity to WNT974 (p=0.0073).
Conclusion: WNT974 produces cytostatic effects in patient ascites cells with primary ovarian cancer through the Wnt/β-catenin pathway. The combination of WNT974 and carboplatin induces cytotoxicity plus cell cycle arrest in a higher percent of ascites samples than with single drug treatment. RSPO fusion mutations do not correlate with WNT974 sensitivity; however, higher PORCN expression indicates increased WNT974 sensitivity.

Item Type: Article
Keywords: Porcupine, WNT, WNT974, LGK974, Ovarian cancer
Date Deposited: 26 Apr 2016 23:45
Last Modified: 26 Apr 2016 23:45
URI: https://oak.novartis.com/id/eprint/26494

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