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- Title
Roles of PDK-1 and PKN in regulating cell migration and cortical actin formation of PTEN-knockout cells.
- Authors
Lim, Mei Ann; Yang, Linda; Yi Zheng; Hong Wu; Dong, Lily Q.; Feng Liu
- Abstract
Mutations in the tumor suppressor protein PTEN (phosphatase and tensin homologue deleted on chromosome 10) enhance cell migration, yet the underlying molecular mechanisms remain largely uncharacterized. Loss of PTEN in mouse embryonic fibroblasts (MEFs) correlates with striking cortical actin accumulation. However, how loss of PTEN leads to cortical actin formation and whether the presence of cortical actin contributes to the increased cell migration are unclear. Here we show that overexpression of dominant-negative forms of (DN) PTEN, RhoA or its kinase-dead (KD) effector, PKN, inhibited cortical actin formation, indicating that cortical actin of Pten-/- MEFs is mediated by the PTEN/Rho/PKN pathway. However, neither DN RhoA nor KD PKN inhibited the enhanced migration of Pten-/- cells, in contrast to the inhibitory effect of DN Rac. In agreement with the previous observation that DN Akt inhibits migration of Pten-/- cells, we demonstrate here that overexpression of KD PDK-1, the Akt kinase, reduces Pten-/- cell migration. Furthermore, overexpression of DN forms of Akt, Rac, or PDK-1, all of which inhibit migration of Pten-/- cells, had no effect on cortical actin accumulation. Our findings suggest that PDK-1/Akt signaling pathway plays a major role in regulating cell migration induced by PTEN deficiency.Oncogene (2004) 23, 9348-9358. doi:10.1038/sj.onc.1208147 Published online 8 November 2004
- Subjects
GENETIC mutation; TUMOR suppressor proteins; CELL migration; CYTOLOGY; FIBROBLASTS; ACTIN
- Publication
Oncogene, 2004, Vol 23, Issue 58, p9348
- ISSN
0950-9232
- Publication type
Article
- DOI
10.1038/sj.onc.1208147