Transcription factor-recognition sequences potentially involved in modulation of gene expression after exposure to low-dose-rate γ-rays in the mouse liver

Guillaume Vares, Yoshihiko Uehara, Tetsuya Ono, Tetsuo Nakajima, Bing Wang, Keiko Taki, Tsuneya Matsumoto, Yoichi Oghiso, Kimio Tanaka, Kazuaki Ichinohe, Shingo Nakamura, Satoshi Tanaka, Mitsuru Nenoi

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

In vivo modulation of gene expression profiles after low-dose and low-dose-rate irradiation has been observed in a variety of experimental systems. However, few studies actually investigated the underlying mechanisms for these genetic responses. In this study, we used pre-existing microarray data and searched for gene modulations in response to long-term, low-dose-rate irradiation. Nucleotide sequences in the neighboring region of the up-regulated, down-regulated, and unaffected genes were retrieved from the Entrez Gene database, and recognition sequences for transcription factors (TFs) were searched using the TFSEARCH database. As a result, we suggested 21 potential TF-binding sites with significantly different incidence between the three gene groups (up-regulated, down-regulated and unaffected gene groups). The binding sites for sterol regulatory element-binding protein 1 (SREBP-1), aryl hydrocarbon receptor (AhR/Ar) and olfactory 1 (Olf-1) were suggested to be involved in up-regulation, while the binding sites for glucocorticoid receptor (GR(GGTACAANNT GTYCTK)) and hepatocyte nuclear factor 1 (HNF-1) were suggested to be involved in down-regulation of the genes. In addition, the binding sites for activating enhancer-binding protein 4 (AP-4), nuclear factor-κB (NFκB), GR (NNNNNNCNNTNTGTNCTNN) and early growth response 3 (Egr-3) were correlated with modulation of gene expression regardless of the direction of modulation. Our results suggest that these TF-binding sites are involved in gene modulations after long-term continuous irradiation with low-dose-rate γ rays. GR and/or SREBP-1 might be associated with the altered metabolic process observed in liver after exposure to low-dose-rate irradiation.

Original languageEnglish
Pages (from-to)249-256
Number of pages8
JournalJournal of radiation research
Volume52
Issue number2
DOIs
Publication statusPublished - 2011

ASJC Scopus subject areas

  • Radiation
  • Radiology Nuclear Medicine and imaging
  • Health, Toxicology and Mutagenesis

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