Mapping of the developmental stages of neurons in the brain using the radiosensitivity as an index.

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Hemispheres of 10-week-old rat brains were irradiated by 10-Gy Xray. Then after two days, we analyzed immunohistochemically the newly-generated migrating neurons to find whether they were survived in the rostral migratory stream from the subventricular zone to the olfactory bulb or to the piriform cortex, and in the hippocampal dentate gyrus. Consequently it was suggested that the radiosensitivity of neurons were determined in an all-or-none manner when those before and after an certain developmental stages were compared with each other. Although this result further had suggested that the decrease of the cell number after the irradiation might be used as an index of the developmental stage of each neuron, it was difficult to be accomplished until the migrating speed of neurons would be clarified.