Akt blocks the tumor suppressor activity of LKB1 by promoting phosphorylation-dependent nuclear retention through 14-3-3 proteins

Ling Liu, Fung Ming Siu, Chi-Ming Che, Aimin Xu, Yu Wang

Research output: Contribution to journalArticleResearchpeer-review

13 Citations (Scopus)

Abstract

The survival kinase Akt and the tumor suppressor LKB1 elicit opposite effects on cell proliferation and tumorigenesis. The present study demonstrates that Akt acts as an upstream kinase of LKB1 to promote the phosphorylation at Ser334 and facilitate its binding to 14-3-3 proteins, resulting in a decreased interaction with STE20-related adaptor protein α (STRADα) and an enhanced nuclear accumulation of LKB1. The S334A mutant of LKB1 exhibits impaired binding with 14-3-3 proteins and is localized predominantly in the cytoplasm, whereas the phosphorylation-mimic mutant, S334D, is sequestrated in the nuclei and unable to elicit the tumor suppressor function. On the other hand, S334A exerts more potent activity than wild type LKB1 in inhibiting the breast cancer cell proliferation and tumor growth in mice. These findings suggest that Akt blocks the anti-growth signal of LKB1 by triggering a phosphorylation-dependent nuclear sequestration of LKB1 through 14-3-3 proteins.

Original languageEnglish
Pages (from-to)175-186
Number of pages12
JournalAmerican Journal of Translational Research
Volume4
Issue number2
Publication statusPublished - 2012
Externally publishedYes

Keywords

  • 14-3-3
  • Akt kinase
  • LKB1
  • Nuclear/cytoplasmic shuttling
  • Tumorigenesis

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