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A new century of Alzheimer's disease research

30 percent and 50 percent of the neurons in the parts of the brain that are responsible for memory function. But, still, sufficient numbers of neurons were left so that some memory function was actually recoverable. The neurons began to work properly once the disease process was halted.”

Dr. Hutton says the tau research is five to 10 years behind AB, and the focus of the “tauologists” at Mayo Clinic is to study how tau tangles disrupt microtubules as well as how the brain recovers and removes those tangles. What they find out can be applied to all diseases of dementia in which tau is involved -- and that is the majority, if not all.

Researchers also are busy using the tau mouse to test small molecules that have already been developed for other diseases that may stop tau from initially changing its chemical shape. One design for a therapeutic drug could be to inhibit the molecules involved in the abnormal phosphorylation of tau, and another might be to find a way to stabilize the microtubules. Amazingly, a cancer drug, Taxol, works to do just that, Dr. Hutton says, because stable microtubules cannot divide -- which a cancer needs to do. He is working with a pharmaceutical company to see if such a cancer treatment might work for Alzheimer’s disease.

All in the genes

Many diseases spring from a person’s unique mix of genes, the variations that flow down the generations through combinations of eggs and sperm. And given the progress science has made in decoding the human genome, Dr. Younkin is convinced that some day soon researchers will have a blueprint of all the genes that raise a person’s risk of developing Alzheimer’s, even if by just a little bit here and there.

“In the world of complex genetics, this is a very exciting time,” Dr. Younkin says. He is part of a team of scientists from four institutions who just reported locating the 14th gene that has a statistically significant association with Alzheimer’s disease.<
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