Tetraspan TM4SF5-dependent direct activation of FAK and metastatic potential of hepatocarcinoma cells

Oisun Jung, Suyong Choi, Sun Bok Jang, Sin Ae Lee, Ssang Taek Lim, Yoon Ju Choi, Hye Jin Kim, Do Hee Kim, Tae Kyoung Kwak, Hyeonjung Kim, Minkyung Kang, Mi Sook Lee, Sook Young Park, Jihye Ryu, Doyoung Jeong, Hae Kap Cheong, Hyun Jeong Kim, Ki Hun Park, Bong Jin Lee, David D. SchlaepferJung Weon Lee

Research output: Contribution to journalArticlepeer-review

40 Scopus citations


Transmembrane 4 L six family member 5 (TM4SF5) plays an important role in cell migration, and focal adhesion kinase (FAK) activity is essential for homeostatic and pathological migration of adherent cells. However, it is unclear how TM4SF5 signaling mediates the activation of cellular migration machinery, and how FAK is activated during cell adhesion. Here, we showed that direct and adhesiondependent binding of TM4SF5 to FAK causes a structural alteration that may release the inhibitory intramolecular interaction in FAK. In turn, this may activate FAK at the cell's leading edge, to promote migration/invasion and in vivo metastasis. TM4SF5-mediated FAK activation occurred during integrin-mediated cell adhesion. TM4SF5 was localized at the leading edge of the cells, together with FAK and actin-organizing molecules, indicating a signaling link between TM4SF5/FAK and actin reorganization machinery. Impaired interactions between TM4SF5 and FAK resulted in an attenuated FAK phosphorylation (the signaling link to actin organization machinery) and the metastatic potential. Our findings demonstrate that TM4SF5 directly binds to and activates FAK in an adhesiondependent manner, to regulate cell migration and invasion, suggesting that TM4SF5 is a promising target in the treatment of metastatic cancer.

Original languageEnglish
Pages (from-to)5960-5973
Number of pages14
JournalJournal of Cell Science
Issue number24
StatePublished - 15 Dec 2012


  • Cell adhesion
  • Focal adhesion kinase
  • Kinase activation
  • Migration
  • Tetraspanin


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