A critical stage in spermatogenesis for radiation-induced cell death in the medaka fish, Oryzias latipes

Yoshikazu Kuwahara, Atsuko Shimada, Hiroshi Mitani, Akihiro Shima

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12 Citations (Scopus)


To ensure the high-fidelity transmission by reproductive cells of genetic information from generation to generation, cells have evolved surveillance systems to eliminate genomic lesions by inducing cell suicide and/or DNA repair. In this report, γ-ray-induced cell death was investigated using the medaka fish, Oryzias latipes, because of the ease with which the differentiation stages of its spermatogenic cells can be identified. After 4.75 Gy γ irradiation, the maximum rate of death of spermatogonial stem cells was observed at 18 h, and that of differentiating spermatogonia was at 12 h, followed by a peak in the extent of DNA fragmentation detected by the TUNEL assay. Dose-response curves for the death rate showed an obvious increase in the death rate for early-differentiating spermatogonia even after 0.11 Gy irradiation, whereas there were no such increases for spermatogonial stem cells and late-differentiating spermatogonia. In the male germ cells of this fish, the stage during spermatogenesis most sensitive to radiation-induced cell death is in early-differentiating spermatogonia, the immediate descendants of the stem cells. These spermatogonia may have a rigorous surveillance system for genomic lesions induced in spermatogonial stem cells.

Original languageEnglish
Pages (from-to)386-392
Number of pages7
JournalRadiation Research
Issue number4
Publication statusPublished - 2002 Jan 1

ASJC Scopus subject areas

  • Biophysics
  • Radiation
  • Radiology Nuclear Medicine and imaging


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