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mLST8 Promotes mTOR-Mediated Tumor Progression.

Kyoko Kakumoto1, Jun-Ichiro Ikeda2, Masato Okada1

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Upregulated mLST8 protein expression drives cancer progression by activating mTORC1 and mTORC2 pathways. Reducing mLST8 inhibits tumor growth and invasiveness, suggesting it as a potential cancer therapeutic target.

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Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • Mechanistic target of rapamycin (mTOR) pathway hyperactivity is observed in many human cancers, contributing to tumor progression.
  • The precise molecular mechanisms driving mTOR upregulation in cancer remain incompletely understood.

Purpose of the Study:

  • To investigate the role of mLST8, a key subunit of mTOR complexes, in cancer development.
  • To elucidate the functional impact of mLST8 expression levels on mTOR pathway activity and tumor cell behavior.

Main Methods:

  • Examined mLST8 expression in human cancer cell lines and tissues.
  • Utilized knockdown and overexpression techniques to assess mLST8 function.
  • Analyzed mTORC1 and mTORC2 complex formation and downstream signaling (AKT, 4E-BP1 phosphorylation).

Main Results:

  • mLST8 expression was elevated in colon and prostate cancer cells and tissues.
  • mLST8 knockdown impaired mTORC1/mTORC2 complex assembly and suppressed tumor cell growth and invasion.
  • mLST8 overexpression promoted anchorage-independent growth in normal cells, while knockdown did not affect normal cell growth.
  • mLST8 knockdown differentially affected mTOR signaling: reduced AKT phosphorylation in all cells, but inhibited 4E-BP1 phosphorylation specifically in cancer cells.

Conclusions:

  • mLST8 exhibits distinct roles in normal versus cancer cells, influenced by its expression level.
  • Upregulated mLST8 contributes to tumorigenesis by constitutively activating both mTORC1 and mTORC2 pathways.
  • mLST8 represents a potential therapeutic target for cancers with elevated mTOR activity.