Transportin 2 regulates apoptosis through the RNA-binding protein HuR

Christopher Von Roretz, Angelo M. Macri, Imed Eddine Gallouzi

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


In response to severe stress, apoptotic cell death is engaged. Apoptosis is a well orchestrated process that involves the activation and implication of many factors. In this study, we identified a role for the nuclear trafficking factorTRN2(transportin 2) in cell death. TRN2 is normally responsible for the nuclear import of the RNA-binding protein HuR. During apoptosis, however, HuR accumulates in the cytoplasm. This is due to the caspase-mediated cleavage of the cytoplasmic fraction of HuR. One of the cleavage fragments generated by this processing of HuR interacts with TRN2 and thus blocks the re-import of HuR into the nucleus. This concentrates HuR in the cytoplasm, advancing apoptosis. Therefore, increasing or decreasing the levels of TRN2 has an inverse consequential effect on cell death, demonstrating for the first time the role of a nucleocytoplasmic transport factor in apoptosis. © 2011 by The American Society for Biochemistry and Molecular Biology, Inc.
Original languageEnglish (US)
Pages (from-to)25983-25991
Number of pages9
JournalJournal of Biological Chemistry
Issue number29
StatePublished - Jul 22 2011
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry
  • Cell Biology
  • Molecular Biology


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