Radiation Triggers a Dynamic Sequence of Transient Microglia Alternation in Juvenile Brain

We show that microglia (the immune cells of the brain) are more resilient in a young brain than in an old one. Microglia are activated after all types of brain injuries, and dogma holds that they remain chronically activated and that this makes the brain degenerate at a faster rate and also makes it more susceptible to subsequent insults. Contrary to this notion, we show that microglia in a young brain (equivalent to that of a child) are transiently activated, for a few days, and then return tow