Availability of medaka as systemic effect model of local irradiation by histological analysis

Asaka, Tomomi*; Ito, Kazusa*; Hashimoto, Chika*; Yasuda, Takako*; Nagata, Kento*; Nishimaki, Toshiyuki*; Katsumura, Takafumi*; Ota, Hiroki*; Suzuki, Michiyo; Funayama, Tomoo; et al.

no journal, , 

Radiotherapy has been widely used in cancer target. It is thought that the irradiation to the particular area of the individual could induce the irradiation impact to the nearby and distant tissues of the irradiated area in addition to the irradiated region. However, it is still difficult to analyze influences to the whole body using mice because of its big body size. Medaka, , is small enough to examine the acute somatic effects induced in all tissues at the cellular levels. In this study, we developed a method to conduct local irradiation on adult medaka using low energy carbon-ion beam in TIARA, JAEA-Takasaki. The irradiated fish were measured the heart rate to evaluate the impact to the heart, chemically fixed, serially sectioned and Hematoxylin/eosin stained. The results suggested that there would be the systemic effects by local irradiation in addition to the effects in the irradiated region, which is probably caused by immune system though blood.