Japan Society for the Promotion of Science:Grants-in-Aid for Scientific Research
Date (from‐to) : 2012/04 -2015/03
Author : KASAI Kenji; INAGUMA Shingo; IKEDA Hiroshi; ITO Hideaki
Cell migration depends on a sequential modification of cytoskeletal complex, which is triggered by the accumulation and activation of ArhGEF7-Pak complex to lamellipodia/filopodia of the cells. In this sutdy, we revealed that SIL/STIL, a cytoplasmic molecule involved in the Hedgehog signaling and over-expressed in human pancreatic cancers, associated with ArhGEF7-Pak1 complex. SIL localized in lamellipodia of huamn pancreatic cancer cell lines along with RAC1,ArhGEF7 and Pak1. SIL-Knockdowned cells harbored enlarged cytoplasm lacking RAC1 and ArhGEF7-Pak1 accumulation in the cell front, which mimiced ArhGEF7-knockdown, and reduced the motility. Furthermore, SIL knockdown-induced reduction of the motility was not rescued by Tet-regulated induction of Pak1 T423E mutant in human pancreatic cancer cell line PANC-1. These evidences indicated an indispensable role of SIL in regulating the subcellular localization of ArhGEF7-Pak1 complex and the cellular movement of pancreatic cancer cells.