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Germ-line mutations ofLKB1 (STK11 ) lead to Peutz–Jeghers syndrome characterized by gastrointestinal polyps and cancer of different organ systems. The mutations lead to loss or severe impairment of Lkb1 serine/threonine kinase activity. ThereforeLKB1 has been implicated as a tumor suppressor gene, but only a few mutations in the coding exons ofLKB1 have been detected in sporadic tumors. Here, we have identified tumor cell lines with severely reduced mRNA levels and impaired Lkb1 kinase activity. Reintroducing Lkb1 into these cells suppressed cell growth. The Lkb1-mediated growth inhibition was caused by a G1 cell cycle block and was not detected with several naturally occurring Lkb1 mutants. These results indicate thatLKB1 has functional and specific growth-suppressing activity.

Growth suppression by Lkb1 is mediated by a G 1 cell cycle arrest

Growth suppression by Lkb1 is mediated by a G ₁ cell cycle arrest