Abstract
Activation of the Ras signaling pathway promotes the growth of malignant human glioblastoma multiforme (GBM). Mutations in Ras are rare in GBM, elevated levels of activated Ras are prevalently observed in GBM. However, the potential mechanism of how Ras is activated in GBM remains unclear. In this study, we screened a new interacted protein of Ras, PHLDA1. Our findings confirmed that PHLDA1 acted as an oncogene and promoted glioma progression and recurrence. We demonstrated that PHLDA1 was upregulated in GBM tissues and cells. PHLDA1 overexpression promoted cell proliferation and tumor growth. In terms of mechanism, PHLDA1 promoted cell proliferation by regulating Ras/Raf/Mek/Erk signaling pathway. Moreover, Src promotes GTPase activity of Ras via tyrosine 32 phosphorylation. PHLDA1 and Src competed for binding with Ras, inhibiting Ras phosphorylation by Src and rescuing Ras activity. This study may provide a new idea of the molecular mechanism underlying glioma progression and a novel potential therapeutic target for comprehensive glioblastoma treatment.
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The data sets used and analyzed during the current study are available from the corresponding author on reasonable request.
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This study was supported by the Natural Science Foundation of Henan (162300410336); National Natural Science Foundation of China (Nos. 82073075).
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ZD and KL designed and supervised the experiments; JW prepared the manuscript; JW, NY, YH, MW, LY, performed experiments; JW, ML, SP and XL performed data analysis and interpretation.
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Wang, J., Yao, N., Hu, Y. et al. PHLDA1 promotes glioblastoma cell growth via sustaining the activation state of Ras. Cell. Mol. Life Sci. 79, 520 (2022). https://doi.org/10.1007/s00018-022-04538-1
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DOI: https://doi.org/10.1007/s00018-022-04538-1