Critical involvement of the phosphatidylinositol 3-kinase/Akt pathway in anchorage-independent growth and hematogeneous intrahepatic metastasis of liver cancer

Kazuaki Nakanishi, Michiie Sakamoto, Jun Yasuda, Masaaki Takamura, Naoya Fujita, Takashi Tsuruo, Satoru Todo, Setsuo Hirohashi

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In the multistep process of metastasis, "anchorage-independent growth," where cancer cells need to survive without cell-substratum interaction, is supposed to be important. In this study, we found that anchorage-independent growth analyzed using the soft agar colony formation assay correlated with hematogeneous intrahepatic metastasis of liver cancer cell lines and also Akt activation status. Two highly metastatic liver cancer cell lines showed high Akt activity and formed many colonies in soft agar, whereas three nonmetastatic cell lines showed less Akt activity and formed fewer colonies. Inhibition of Akt activation in the highly metastatic cell line Li7 by transfection with kinase-dead Akt or the phosphatidylinositol 3-kinase inhibitor, LY294002, resulted in formation of fewer colonies in soft agar than was the case with control cells. Moreover, in orthotopic implantation model, this inhibition resulted in a reduced rate of hematogeneous intrahepatic metastasis. These findings indicated that anchorage-independent growth regulated by phosphatidylinositol 3-kinase/Akt pathway plays a critical role in metastasis, and that this could be a potential therapeutic target to combat metastasis.

Original languageEnglish
Pages (from-to)2971-2975
Number of pages5
JournalCancer Research
Issue number10
Publication statusPublished - 2002 May 15
Externally publishedYes


ASJC Scopus subject areas

  • Oncology
  • Cancer Research

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