Word: tau
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...Tau, by contrast, clearly played a critical role in the brain. In its normal form it helps support the axons--long projections that carry signals from one nerve cell to another--holding them together like ties on a railroad track. When tau goes bad and clumps into tangles, the axons shrivel up and die. The case for tau further solidified in 1998, when researchers discovered a form of dementia associated with mutations of the tau gene. People with these mutations did not develop the plaques associated with Alzheimer's disease, but at death, their brains were riddled with tangles...
Beyond that, things get murky. It's not yet clear, for example, when tau enters the picture. Up to now, most thought the tangles form much later than the plaques. But neuroscientist Peter Davies of Albert Einstein College of Medicine thinks this view will be proved wrong. He believes some still unidentified biochemical event precedes the formation of tangles and plaques, perhaps a malfunction in the machinery that puts proteins together. "The question from the therapeutic standpoint," he observes, "is, What's responsible for the symptoms of disease? What's killing the cells? Is it amyloid or tau...
BEYOND BETA AMYLOID AND TAU...
...target is a rogue protein known as beta amyloid, which forms the plaques that fill the brain's memory centers; just two weeks ago scientists identified one of the enzymes that are key to its formation. Another is an abnormal variant of the tau protein, which is thought to clutter the interiors of nerve cells with threadlike tangles. Over the coming years, as a new generation of Alzheimer's drugs enters the clinical pipeline, the arguments that rage today over which is more important, beta amyloid or tau, may be resolved. Kosik suspects that both may be critical...
...symptoms. But by 2025, control could come to resemble a cure. For Alzheimer's has something in common with other brain disorders such as Parkinson's, Huntington's and mad-cow disease. Like them, it appears to be caused by misfolded proteins--in this case, beta amyloid and tau. And so one day in the 21st century it may become possible to vanquish Alzheimer's with a vaccine that targets these miscreants, or a new class of drugs that prevents them from forming. Kosik even has a name for these drugs--"broad-spectrum anti-aggregates," he calls them, after...