Killer T cells may dampen new nerve cell production in aged mice
Researchers have recently found more T cells in the aging human brain, and they were up to no good. Where typically T cells are part of a robust immune system in the body and not often found in the brain, scientists identified them migrating to the brain of old mice. Similar experiments were performed on human brains after death and comparable results found, and that T cells were more abundant in tissue from people ages 79 to 93 than in tissue from people ages 20 to 44.
This begs the question or questions, what is the significance of T cells entering the brain as we age and why, after all the years in our bodies protecting us, are they suddenly acting against us?