Expression profile of cell cycle-related genes in human fibroblasts exposed simultaneously to radiation and simulated microgravity

Hiroko Ikeda, Masafumi Muratani, Jun Hidema, Megumi Hada, Keigi Fujiwara, Hikaru Souda, Yukari Yoshida, Akihisa Takahashi

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


Multiple unique environmental factors such as space radiation and microgravity (µG) pose a serious threat to human gene stability during space travel. Recently, we reported that simultaneous exposure of human fibroblasts to simulated µG and radiation results in more chromosomal aberrations than in cells exposed to radiation alone. However, the mechanisms behind this remain unknown. The purpose of this study was thus to obtain comprehensive data on gene expression using a three-dimensional clinostat synchronized to a carbon (C)-ion or X-ray irradiation system. Human fibroblasts (1BR-hTERT) were maintained under standing or rotating conditions for 3 or 24 h after synchronized C-ion or X-ray irradiation at 1 Gy as part of a total culture time of 2 days. Among 57,773 genes analyzed with RNA sequencing, we focused particularly on the expression of 82 cell cycle-related genes after exposure to the radiation and simulated µG. The expression of cell cycle-suppressing genes (ABL1 and CDKN1A) decreased and that of cell cycle-promoting genes (CCNB1, CCND1, KPNA2, MCM4, MKI67, and STMN1) increased after C-ion irradiation under µG. The cell may pass through the G1/S and G2 checkpoints with DNA damage due to the combined effects of C-ions and µG, suggesting that increased genomic instability might occur in space.

Original languageEnglish
Article number4791
JournalInternational journal of molecular sciences
Issue number19
Publication statusPublished - 2019 Oct 1
Externally publishedYes


  • Cell cycle
  • Combined effects
  • Gene expression
  • Radiation
  • Simulated microgravity

ASJC Scopus subject areas

  • Catalysis
  • Molecular Biology
  • Spectroscopy
  • Computer Science Applications
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry


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