All of this contributes to a breakdown of the neural highway that helps our brain cells communicate. These changes in the brain can begin years before anyone starts actually exhibiting any symptoms of memory loss or personality changes.
Until recently, it’s been a challenge to understand the disease, let alone identify who has it. The only way to definitively diagnose Alzheimer’s is still after someone has died and their brain can be examined under the microscope, looking for the telltale amyloid plaques and tau tangles.
A new hope
In the past five years, advanced imaging technology has allowed us to see tau and amyloid in living people.
By identifying these biomarkers earlier, Hendrix told me, scientists can work on finding ways to prevent the brain from deteriorating.
“If we can catch the earliest signs of Alzheimer’s, then we’re treating a mostly healthy brain, and keeping it mostly healthy. … It’s very difficult to repair the damage once it’s done,” he explained.
He points out that one of the greatest faults with some of the trials has not been in the treatment itself but in the application: too late in the disease’s progression, when symptoms are already occurring. “It’s like trying to give someone Lipitor when they have a heart attack,” he explained. “You had to do it earlier.”
Tanzi said we need to think about Alzheimer’s like cancer or heart disease. “That’s how we’re going to beat the disease: early detection and early intervention.”
Most of the focus in Alzheimer’s research has been on tau and amyloid, what Gates likes to call “the mainstream.” With his donation, Gates hopes to spur research into more novel ideas about the disease, like investigating the role of the glial cells that activate the immune system of the brain or how the energy lifespan of a cell may contribute to the disease.