Scientists report that a protein capable of producing what has been called “Alzheimer’s of the heart” has been found to protect against development of Alzheimer’s disease in the brain in rodent models. The scientists say the findings suggest that the protein, transthyretin (TTR), could represent a powerful natural defense against development of Alzheimer’s disease in humans, a defense that diminishes as people grow older. If so, TTR-based therapy might help treat or prevent the disorder.