TIF1? inhibits lung adenocarcinoma EMT and metastasis by interacting with the TAF15/TBP complex.

The molecular underpinnings of lung adenocarcinoma (LUAD) metastasis remain poorly defined. Here, using human LUAD cell lines, we find that transcriptional intermediary factor 1 ? (TIF1?) binds to TATA box binding protein (TBP) in competition with TBP-associated factor 15 (TAF15) and impedes TAF15/TBP-mediated interleukin 6 (IL-6) transactivation. TIF1? modifies TAF15 ...
through multi-mono-ubiquitylation and drives nuclear export of TAF15. Functionally, TAF15 accelerates epithelial-mesenchymal transition (EMT) and metastasis of LUAD cells, acting in just the opposite way as TIF1?. Low TIF1? or high TAF15 expression levels are shown in metastatic LUAD specimens and correlate with poor survival of individuals with LUAD. Our findings suggest that the TAF15/TBP complex is required for IL-6 activation-induced EMT and invasion, which are inhibited by TIF1?. This study highlights the crucial interaction between TIF1? and the TAF15/TBP complex for regulating EMT and metastasis in LUAD.
Mesh Terms:
Adenocarcinoma of Lung, Epithelial-Mesenchymal Transition, Humans, Interleukin-6, Lung Neoplasms, TATA-Binding Protein Associated Factors, TATA-Box Binding Protein
Cell Rep
Date: Oct. 18, 2022
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