Environmental radiation on large Japanese field mice in Fukushima reduced colony forming potential in hematopoietic progenitor cells without inducing genomic instability Academic Article uri icon

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  • PURPOSE: To study the environmental radiation effects of wild animals after the Fukushima Dai-ichi nuclear power plant accident, we assessed effects on hematopoietic progenitor cells (HPCs) in large Japanese field mice (Apodemus speciosus). MATERIALS AND METHODS: A. speciosus were collected from three contaminated sites and control area. The air dose-rates at the control and contaminated areas were 0.96 ± 0.05 μGy/d (Hirosaki), 14.4 ± 2.4 μGy/d (Tanashio), 208.8 ± 31.2 μGy/d (Ide), 470.4 ± 93.6 μGy/d (Omaru), respectively. We investigated possible DNA damage and pro-inflammatory markers in the bone marrow (BM) cells. The colony-forming potential of BM cells was estimated by the number of HPC colony-forming cells. Radiation-induced genomic instability (RIGI) in HPCs was also analyzed by quantifying delayed DNA damage in CFU-GM clones. RESULTS: Although no significant differences in DNA damage and inflammation markers in BM cells from control and contaminated areas, the number of HPC colonies exhibited an inverse correlation with air dose-rate. With regard to RIGI, no significant differences in DNA damage of CFU-GM clones between the mice from the control and the three contaminated areas. CONCLUSIONS: Our study suggests that low dose-rate radiation of more than 200 Gy/d reduced HPCs, possibly eliminating genomically unstable HPCs.


  • Ariyoshi, Kentaro
  • Miura, Tomisato
  • Kasai, Kosuke
  • Goh, Valerie Swee Ting
  • Fujishima, Yohei
  • Nakata, Akifumi
  • Takahashi, Atsushi
  • Shimizu, Yoshinaka
  • Shinoda, Hisashi
  • Yamashiro, Hideaki
  • Seymour, Colin
  • Mothersill, Carmel Emelia
  • Yoshida, Mitsuaki A

publication date

  • August 20, 2020