Memantine Helps Mice Keep Their Memory When Stress Hits

Mice that feel a sudden stress lose their ability to remember where food is. Scientists found that both male and female mice show this loss, but the brain changes are different for each sex. In females, the part of the brain called the dorsal hippocampus turns up a protein called NMDA receptor. In males, the same brain area does not change in this way. The researchers wanted to see if a drug called memantine could stop the memory loss. Memantine blocks NMDA receptors, so it might help when these proteins are too active.They gave the drug to both male and female mice before stressing them. The results were clear. Female mice that received memantine kept their memory and did not show the usual brain changes. Male mice also stayed sharp, but the drug worked through a different brain pathway. This study shows that stress hurts memory by changing glutamate signals in the hippocampus. It also tells us that a single drug can protect memory, but it works differently in males and females. Understanding these differences may help create better treatments for people who suffer from stress‑related memory problems.