Abstract
During pathological conditions, extracellular-5′-nucleotidase/CD73 can protect neurons by reducing the permeability of the blood brain barrier. In recent years, it has been demonstrated that CD73 can negatively contribute to the growth of gliomas; however, the function of CD73 in glioma blood vessels is not clear. We analysed the expression of CD73 in 72 glioma patients using immunohistochemistry and correspondingly compared the results with the Edema index (EI). We established an in vitro model of the blood-tumour barrier and analysed the expression of CD73 in vascular endothelial cells. Lastly, CD73 expression was inhibited in endothelial cells, and the effects of this inhibition on tight junction structure and transendothelial resistance were observed. Compared to normal brains, the expression of CD73 in blood vessels of glioma patients was significantly decreased, and the amount was lower in the centre of the tumour than the periphery. The proportion of CD73-positive blood vessels had a positive correlation with the EI. The expression of CD73 in the in vitro endothelial cell blood-tumour barrier model was decreased. Lastly, inhibiting CD73 was found to decrease the expression of tight junction related proteins in endothelial cells and to decrease the value of transendothelial electric resistance. The expression of CD73 in glioma blood vessels was significantly decreased, which may play a multi-functional role in decreasing the expression of tight junction related proteins of brain microvascular endothelial cells and may also increase blood-tumour barrier permeability and accelerate the formation of PTBE.
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Acknowledgments
We thank all the surgeons from the Neurosurgery Department of the Tianjin HuanHu Hospital for their help in gathering the tumour biopsies; Yi Zhang, Fang Lan, and Xin He for the critical reading of the manuscript and for helpful suggestions. The work is supported by the Science and Technology Foundation of the Tianjin Health Bureau (2014KY19).
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B. Wang and D. Wang contributed to the paper equally.
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Wang, B., Wang, D., Zhu, Z. et al. The role of extracellular-5′-nucleotidase/CD73 in glioma peritumoural brain edema. Neurol Sci 37, 603–611 (2016). https://doi.org/10.1007/s10072-016-2510-4
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DOI: https://doi.org/10.1007/s10072-016-2510-4