Chronic mTOR activation promotes cell survival in Merkel cell carcinoma

Zhenyu Lin, Amelia McDermott, Lijian Shao, Aarthi Kannan, Michael Morgan, Brendan C. Stack, Mauricio Moreno, Daniel A. Davis, Lynn A. Cornelius, Ling Gao

Research output: Contribution to journalArticlepeer-review

43 Scopus citations

Abstract

Merkel cell carcinoma (MCC) is an aggressive skin cancer with rising incidence. In this study, we demonstrate that mTOR activation and suppressed autophagy is common in MCCs. mTOR inhibition in two primary human MCC cell lines induces autophagy and cell death that is independent of caspase activation but can be attenuated by autophagy inhibition. This is the first study to evaluate mTOR and autophagy in MCC. Our data suggests a potential role of autophagic cell death upon mTOR inhibition and thus uncovers a previously underappreciated role of mTOR signaling and cell survival, and merits further studies for potential therapeutic targets.

Original languageEnglish
Pages (from-to)272-281
Number of pages10
JournalCancer Letters
Volume344
Issue number2
DOIs
StatePublished - Mar 28 2014

Keywords

  • Autophagy
  • Cell death
  • MTOR inhibitor
  • MTOR pathway
  • Merkel cell carcinoma

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