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 y (TIF1y) binds to TATA box binding protein (TBP) in competition with TBP-associated factor 15 (TAF15) and impedes TAF15/TBP-mediated inter-leukin 6 (IL-6) transactivation. TIF1y 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 TIF1y. Low TIF1y 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 in-hibited by TIF1y. This study highlights the crucial interaction between TIF1y and the TAF15/TBP complex for regulating EMT and metastasis in LUAD.

Automated summary

This study reveals the molecular mechanisms underlying lung adenocarcinoma (LUAD) metastasis, highlighting the crucial role of the TAF15/TBP complex in promoting EMT and invasion of LUAD cells, which is inhibited by TIF1y.