Rapamycin, a drug that keeps the immune system from attacking transplanted organs, was recently found to extend the life span of aged research mice. Now a study involving genetically engineered mice has found that 10 weeks of taking the drug improved learning and memory and reduced Alzheimer's-like damage in the brain.
Reference
Caccamo, A., Majumder, S., Richardson, A., Strong, R., & Oddo, S. (2010). Molecular interplay between mTOR, A and tau: Effects on cognitive impairments. Journal of Biological Chemistry. Retrieved from http://www.jbc.org/content/early/2010/02/23/jbc.M110.100420.abstract?sid=8b1903cb-9f7a-4968-bd57-4790352d43cb