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Lack of evidence for PlGF mediating the tumor resistance after anti-angiogenic therapy in malignant gliomas

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Abstract

Placenta growth factor (PlGF) is a member of vascular endothelial growth factor family which can promote cancer growth by various mechanisms. Placenta growth factor is upregulated in many neoplastic diseases and serum levels of PlGF are increased in cancer patients following anti-angiogenic therapy. However, its role in glioma growth is yet not fully elucidated. In this study we analyzed the expression of PlGF mRNA using real time PCR in human gliomas of different WHO grades. Placenta growth factor mRNA levels were highly variable and did not correlate with WHO grades, arguing against a significant role in glioma progression. The highest PlGF expression was observed in anaplastic astrocytomas whereas grade II astrocytomas and glioblastomas displayed lower levels of expression. Immunohistochemical analysis showed that PlGF was expressed by inflammatory and endothelial cells in addition to tumor cells. Placenta growth factor mRNA expression in 12 matched glioblastoma samples before and after therapy, including bevacizumab and cilengitide treatment was largely unaffected by the aforementioned treatment modalities. In vitro, the exposure of VEGFR-1 expressing glioma cells to bevacizumab did not increase the expression levels of PlGF mRNA. In summary, our results do not support the hypothesis that PlGF plays a major role in the resistance of gliomas after anti-angiogenic therapy.

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Acknowledgments

Our work was supported by grants from the Deutsche Krebshilfe (Project Number 109410). We thank Dr. Carro and Dr. Osterberg, Department of Neurosurgery, University Medical Center Freiburg for providing the glioma cells, Prof. Shibuya (University of Tokio) for providing the monoclonal anti-VEGFR-1 antibody, S. Reiser for screening of the glioma cells, Ms. Eva Bug for processing the tumor tissue samples and C. El Gaz, K. Strasser and V. Sverdlick for help with the immunohistochemistry analysis.

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Correspondence to Marcia Regina Machein.

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Schneider, K., Weyerbrock, A., Doostkam, S. et al. Lack of evidence for PlGF mediating the tumor resistance after anti-angiogenic therapy in malignant gliomas. J Neurooncol 121, 269–278 (2015). https://doi.org/10.1007/s11060-014-1647-3

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  • DOI: https://doi.org/10.1007/s11060-014-1647-3

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