The origin of blood and lymphatic vessels in high-grade serous adenocarcinoma of ovary (HGSOC) is uncertain. We evaluated the potential of cancer stem cells (CSCs) in HGSOC to contribute to their formation. Using spheroids as an in vitro model for CSCs, we have evaluated their role in primary malignant cells (PMCs) in ascites from previously untreated patients with HGSOC and cell lines. Spheroids from PMCs grown under specific conditions showed significantly higher expression of endothelial, pericyte and lymphatic endothelial markers. These endothelial and lymphatic cells formed tube-like structures, showed uptake of Dil-ac-LDL and expressed endothelial nitric oxide synthase confirming their endothelial phenotype. Electron microscopy demonstrated classical Weibel–Palade bodies in differentiated cells. Genetically, CSCs and the differentiated cells had a similar identity. Lineage tracking using green fluorescent protein transfected cancer cells in nude mice confirmed that spheroids grown in stem cell conditions can give rise to all three cells. Bevacizumab, a monoclonal antibody that targets vascular endothelial growth factor inhibited the differentiation of spheroids to endothelial cells in vitro. These results suggest that CSCs contribute to angiogenesis and lymphangiogenesis in serous adenocarcinoma of the ovary, which can be inhibited.
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We thank Department of Biotechnology (DBT), Government of India for funding this project and Indian Council for Medical Research (ICMR) for the Senior Research Fellowship for S.K.P, B.S and R.P.N. We also thank Department of Science and Technology and University Grants Commission for the Research Fellowships to M.P and S.S, respectively. We thank Dr.V.Sridevi and Dr.Ujwala, Cancer Institute for their help in identifying patients with ovarian cancer. We are grateful to the Staff and nurses of Department of Medical Oncology, flow cytometry facility at the Department of Molecular Oncology, Cancer Institute and IIT Madras, Departments of Electron microscopy, Pathology, Epidemiology and Statistics at Cancer Institute for their help. We also thank Dr.Manoj Garg for his suggestions and help for the in vivo experiments.
Funding were provided by Department of Biotechnology, Ministry of Science and Technology (Grant No. 102/IFD/SAN/890/2016-2017), Indian Council of Medical Research (Grant No. 3/2/2/169/2012-NCD III) and Department of Science and Technology, Ministry of Science and Technology (Grant No. IF40020).
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Krishnapriya, S., Sidhanth, C., Manasa, P. et al. Cancer stem cells contribute to angiogenesis and lymphangiogenesis in serous adenocarcinoma of the ovary. Angiogenesis 22, 441–455 (2019). https://doi.org/10.1007/s10456-019-09669-x
- Cancer stem cells
- Endothelial cells
- Serous adenocarcinoma of ovary