We studied the effect of intranasal administration of neural stem cell (NSC)-derived exosomes on behavior and cognitive functions of mice in the late period after head irradiation in a dose of 8 Gy. The used exosomes had specific markers (CD9+/CD63+, 99.5%; TSG101+, 98.4%) and mean size 105.7±8.8 nm according to dynamic light scattering data and 119.0±12.4 nm according to nanoparticle tracking analysis (NTA). Exosome suspension (2×1012 particles/ml according to NTA measurements) was administered intranasally for 4 weeks starting from 48 h after irradiation in a volume of 5 μl/nostril (2×1010 exosomes/mouse). It was shown that intranasal administration of mouse NSC-derived exosomes prevented delayed radiation-induced behavioral changes and recognition memory impairments in mice after head irradiation.
Keywords: cognitive impairments; exosomes; head irradiation; mice; neural stem cells.
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