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Blocking the bFGF/STAT3 interaction through specific signaling pathways induces apoptosis in glioblastoma cells

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Abstract

We have reported that basic fibroblast growth factor (bFGF) demonstrates an intimate connection with signal transducer and activator of transcription 3 (STAT3) in malignant brain tumor cells. However, its mechanisms are still unclear. In this study, we used inhibitors to block specific signaling pathways, including JAK, PI3K/Akt, and Src pathways, to explore how bFGF mediates crosstalk with STAT3 in two glioblastoma(GBM) cell lines: U251 (mutant p53) and U87 (wild-type p53). Furthermore, we explored how the bFGF/STAT3 pathway affects GBM cell apoptosis. Our results suggest that bFGF can induce the activation of STAT3 mainly through the JAK and PI3K/Akt pathways, and that siRNA-mediated knockdown of STAT3 markedly reduces the bFGF levels in U251 cells. Our results also suggest that STAT3 knockdown increases the expression of pro-apoptotic genes and decreases the expression of anti-apoptotic genes, subsequently collapsing the mitochondrial membrane potentials in vitro and impairs tumor growth in vivo.

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Acknowledgments

This study was supported by grants from the National Natural Science Foundation of China (81101911), National Clinical Key Specialty Project Foundation of the Ministry of Health, P. R. China (2011873), the Tianjin Science and Technology Committee (11JCYBJC12100, 12ZCDZSY17700, 14JCZDJC35600), the Foundation of Tianjin Bureau of Public Health (11KG115, 2011KR11, 2012KR07) and the China Scholarship Council.

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The authors have no conflict of interest.

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Correspondence to Jinhuan Wang or Xiaoguang Tong.

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Jingchao Wu and Xuequan Feng contributed equally to this work and should be considered as co-first author.

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Wu, J., Feng, X., Zhang, B. et al. Blocking the bFGF/STAT3 interaction through specific signaling pathways induces apoptosis in glioblastoma cells. J Neurooncol 120, 33–41 (2014). https://doi.org/10.1007/s11060-014-1529-8

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  • DOI: https://doi.org/10.1007/s11060-014-1529-8

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