DNA damage-induced dynamic changes in abundance and cytosol-nuclear translocation of proteins involved in translational processes, metabolism, and autophagy

Research output: Contribution to journalJournal articleResearchpeer-review

  • Martin V. Bennetzen
  • Martin Kosar
  • Jakob Bunkenborg
  • Mark Ronald Payne
  • Jirina Bartkova
  • Mikael S Lindström
  • Lukas, Jiri
  • Jens S. Andersen
  • Jiri Bartek
  • Dorthe Helena Larsen

Ionizing radiation (IR) causes DNA double-strand breaks and activates a versatile cellular response regulating DNA repair, cell-cycle progression, transcription, DNA replication and other processes. In recent years proteomics has emerged as a powerful tool deepening our understanding of this multifaceted response. In this study we use SILAC-based proteomics to specifically investigate dynamic changes in cytoplasmic protein abundance after ionizing radiation (IR); we present in-depth bioinformatics analysis and show that levels of proteins involved in autophagy (cathepsins and other lysosomal proteins), proteasomal degradation (cathepsins and Ubiquitin-related proteins), energy metabolism (mitochondrial proteins) and particularly translation (ribosomal proteins and translation factors) are regulated after cellular exposure to ionizing radiation. Downregulation of no less than 68 ribosomal proteins shows rapid changes in the translation pattern after IR. Additionally, we provide evidence of compartmental cytosol-nuclear translocation of numerous DNA damage related proteins using a protein correlation profiling. In conclusion, these results highlight unexpected cytoplasmic processes actively orchestrated after genotoxic insults and protein translocation from the cytoplasm as a fundamental regulatory mechanism employed to aid cell survival and preservation of genome integrity.

Original languageEnglish
JournalCell Cycle
Issue number17
Pages (from-to)2146-2163
Publication statusPublished - 2018

ID: 202386237