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Oral presentation

Modulatory effect of ionizing radiation on food-NaCl associative learning; The Role of $$gamma$$ subunit of G protein in ${it Caenorhabditis elegans}$

Sakashita, Tetsuya; Hamada, Nobuyuki*; Ikeda, Daisuke*; Yanase, Sumino*; Suzuki, Michiyo; Ishii, Naoaki*; Kobayashi, Yasuhiko

no journal, , 

Exposure to IR induced an additional decrease in chemotaxis immediately after an acute dose in the transition stage of the salt chemotaxis learning. Chronic irradiation induced negative chemotaxis in the exposed animals, i.e., the primary avoidance response. IR-induced additional decreases in chemotaxis following acute and chronic irradiations were significantly suppressed in the ${it gpc-1}$ mutant, which was defective in GPC-1 (one of the two $$gamma$$ subunits of the heterotrimeric G-protein). Chemotaxis to cAMP, but not to lysine and benzaldehyde, was influenced by IR during the food-NaCl associative learning. Our novel findings suggest that IR behaves as a modulator in the salt chemotaxis learning via ${it C. elegans}$ GPC-1 and a specific neuronal network, and may shed light on the modulatory effect of IR on learning.

Oral presentation

Effects of $$gamma$$-ray irradiation on olfactory adaptation to benzaldehyde in ${it Caenorhabditis elegans}$

Sakashita, Tetsuya; Suzuki, Michiyo; Hamada, Nobuyuki*; Ikeda, Daisuke*; Yanase, Sumino*; Ishii, Naoaki*; Kobayashi, Yasuhiko

no journal, , 

Using ${it Caenorhabditis elegans}$ as a model organism for studying the nervous system, we investigated the effects of $$gamma$$-ray irradiation on olfactory adaptation to benzaldehyde, in which animals show a decrease in chemotaxis to benzaldehyde. Irradiation during the conditioning for adaptation to benzaldehyde did not induce an additional decrease in chemotaxis immediately after irradiation. On the other hand, at 1 h after irradiation, the progress of adaptation to benzaldehyde was interrupted by $$gamma$$-irradiation with the highest dose. These results indicate that impaired olfactory adaptation to benzaldehyde following $$gamma$$-irradiation is different from salt chemotaxis learning in ${it C. elegans}$. Our findings suggest that the profile of radiation-induced response depends on the function of the nervous system in ${it C. elegans}$.

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