Title : c-Src Phosphorylates and Inhibits the Function of the CIC Tumor Suppressor Protein.

Pub. Date : 2020 May

PMID : 32029440






5 Functional Relationships(s)
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1 On the other hand, CIC mutant allele (CIC-Y1455F), that escapes c-Src-mediated tyrosine phosphorylation, remains localized to the nucleus and retains strong repressor function against CIC targets, the oncogenic transcription factors ETV1 and ETV5. Tyrosine SRC proto-oncogene, non-receptor tyrosine kinase Homo sapiens
2 Furthermore, we show that the orally available Src family kinase inhibitor, dasatinib, which prevents EGF-mediated tyrosine phosphorylation of CIC and attenuates elevated ETV1 and ETV5 levels, reduces viability of GBM cells and glioma stem cells (GSC), but not of their control cells with undetectable c-Src activity. Tyrosine SRC proto-oncogene, non-receptor tyrosine kinase Homo sapiens
3 In fact, GBM cells and GSC expressing the tyrosine-defective CIC mutant (Y1455F) lose sensitivity to dasatinib, further endorsing the effect of dasatinib on Src-mediated tyrosine phosphorylation of CIC. Tyrosine SRC proto-oncogene, non-receptor tyrosine kinase Homo sapiens
4 In fact, GBM cells and GSC expressing the tyrosine-defective CIC mutant (Y1455F) lose sensitivity to dasatinib, further endorsing the effect of dasatinib on Src-mediated tyrosine phosphorylation of CIC. Tyrosine SRC proto-oncogene, non-receptor tyrosine kinase Homo sapiens
5 Implications: c-Src tyrosine-phosphorylates CIC exports to cytoplasm and inactivates its repressor function in GBM. Tyrosine SRC proto-oncogene, non-receptor tyrosine kinase Homo sapiens