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Full-Text Articles in Medicine and Health Sciences
P70s6k1 (S6k1)-Mediated Phosphorylation Regulates Phosphatidylinositol 4-Phosphate 5-Kinase Type I Γ Degradation And Cell Invasion, Naser Jafari, Qiaodan Zheng, Liqing Li, Wei Li, Lei Qi, Jianyong Xiao, Tianyan Gao, Cai Huang
P70s6k1 (S6k1)-Mediated Phosphorylation Regulates Phosphatidylinositol 4-Phosphate 5-Kinase Type I Γ Degradation And Cell Invasion, Naser Jafari, Qiaodan Zheng, Liqing Li, Wei Li, Lei Qi, Jianyong Xiao, Tianyan Gao, Cai Huang
Markey Cancer Center Faculty Publications
Phosphatidylinositol 4-phosphate 5-kinase type I γ (PIPKIγ90) ubiquitination and subsequent degradation regulate focal adhesion assembly, cell migration, and invasion. However, it is unknown how upstream signals control PIPKIγ90 ubiquitination or degradation. Here we show that p70S6K1 (S6K1), a downstream target of mechanistic target of rapamycin (mTOR), phosphorylates PIPKIγ90 at Thr-553 and Ser-555 and that S6K1-mediated PIPKIγ90 phosphorylation is essential for cell migration and invasion. Moreover, PIPKIγ90 phosphorylation is required for the development of focal adhesions and invadopodia, key machineries for cell migration and invasion. Surprisingly, substitution of Thr-553 and Ser-555 …
Talin2-Mediated Traction Force Drives Matrix Degradation And Cell Invasion, Lei Qi, Naser Jafari, Xiang Li, Zaozao Chen, Liqing Li, Vesa P. Hytönen, Benjamin T. Goult, Chang-Guo Zhan, Cai Huang
Talin2-Mediated Traction Force Drives Matrix Degradation And Cell Invasion, Lei Qi, Naser Jafari, Xiang Li, Zaozao Chen, Liqing Li, Vesa P. Hytönen, Benjamin T. Goult, Chang-Guo Zhan, Cai Huang
Markey Cancer Center Faculty Publications
Talin binds to β-integrin tails to activate integrins, regulating cell migration, invasion and metastasis. There are two talin genes, TLN1 and TLN2, encoding talin1 and talin2, respectively. Talin1 regulates focal adhesion dynamics, cell migration and invasion, whereas the biological function of talin2 is not clear and, indeed, talin2 has been presumed to function redundantly with talin1. Here, we show that talin2 has a much stronger binding to β-integrin tails than talin1. Replacement of talin2 Ser339 with Cys significantly decreased its binding to β1-integrin tails to a level comparable to that of talin1. Talin2 localizes at invadopodia and is indispensable …