Abstract
Objective
Studies have demonstrated that the transcription factor forkhead box P3 (FOXP3) is expressed not only in regulatory T cells, but also in some cancer cells. This study aims to clarify whether or not FOXP3 expression occurs in human gliomas and investigate the clinical significance of this expression in gliomas.
Methods
We detected FOXP3 protein expression in 40 glioma samples, 3 normal brain tissue samples, and 4 normal tonsil tissue samples using immunohistochemical staining and western blot. The expression of FOXP3 protein was also detected in five glioma cell lines by western blot. We also evaluated the association of FOXP3 expression with clinical pathological grades, prognosis, and recurrence.
Results
Western blot analysis showed that the expression of FOXP3 protein was upregulated in high-grade glioma (HGGS) samples compared with low-grade samples. The cell line U87 showed the highest FOXP3 expression, while U373 had the lowest expression. Immunohistochemical analysis detected FOXP3 protein in 35 out of the 40 (87.5 %) glioma samples and high levels of FOXP3 were observed in 26 out of the 27 (96.3 %) high-grade gliomas samples. Statistical analysis suggested that the upregulation of FOXP3 is significantly correlated with the histologic grade of gliomas (P < 0.05) and that patients with high expression of FOXP3 protein exhibit a poorer prognosis than those with low FOXP3 expression.
Conclusions
Our findings suggest that FOXP3 expression in glioma cells has a crucial function in the development of HGGS and is associated with the malignant biological behavior of HGGS.
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Acknowledgments
This work was supported by the grant from the Tianjin Science and Technology Committee (11JCYBJC12100, 12ZCDZSY17700), the National Natural Science Foundation of China (81101911), the Tianjin Health Bureau Science and Technique Foundation (11KG115), and State Key Clinical Department of Neurosurgery.
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L. Wang and B. Zhang contributed equally to this work and should be considered as co-first authors.
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Wang, L., Zhang, B., Xu, X. et al. Clinical significance of FOXP3 expression in human gliomas. Clin Transl Oncol 16, 36–43 (2014). https://doi.org/10.1007/s12094-013-1037-x
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DOI: https://doi.org/10.1007/s12094-013-1037-x