The role of cyclin D1 in response to longterm exposure to ionizing radiation

Tsutomu Shimura, Manabu Fukumoto, Naoki Kunugita

Research output: Contribution to journalReview articlepeer-review

31 Citations (Scopus)


The health-related hazards resulting from long-term exposure to radiation remain unknown. Thus, an appropriate molecular marker is needed to clarify these effects. Cyclin D1 regulates the cell cycle transition from the G1 phase to the S phase. Cyclin D1 is degraded as a G1/S checkpoint after 10 Gy of single acute radiation exposure, whereas conversely, cyclin D1 is stabilized when human tumor cells are exposed to fractionated radiation (FR) with 0.5 Gy of x-rays for 31 d. In this article, we review new findings regarding cyclin D1 overexpression in response to long-term exposure to FR. Cyclin D1 overexpression is associated with induction of genomic instability in irradiated cells. Therefore, repression of cyclin D1 expression is likely to cancel the harmful effects of long-term exposure to FR. Thus cyclin D1 may be a marker of long-term exposure to radiation and is a putative molecular radioprotection target for radiation safety.

Original languageEnglish
Pages (from-to)2738-2743
Number of pages6
JournalCell Cycle
Issue number17
Publication statusPublished - 2013 Sep 1


  • AKT
  • Cyclin D1
  • Double-strand breaks
  • Long-term fractionated radiation
  • Radioprotection

ASJC Scopus subject areas

  • Molecular Biology
  • Developmental Biology
  • Cell Biology


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