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

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

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
JournalInternational Journal of Radiation Biology
DOIs
Publication statusAccepted/In press - 2020

Keywords

  • Apodemus speciosus
  • Radiation effect
  • hematopoietic progenitor cells
  • radiation-induced genomic instability
  • wild animal

ASJC Scopus subject areas

  • Radiological and Ultrasound Technology
  • Radiology Nuclear Medicine and imaging

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