An antibody that can almost completely clear the visible signs of Alzheimer’s disease from the brain has been discovered in a breakthrough that left one scientist “trying not to get too excited”.
Researchers scanned the brains of people with the degenerative condition as they were given doses of the drug, which is based on an immune cell taken from the blood of elderly people aged up to 100 who showed no signs of the disease.
After a year, virtually all the toxic “amyloid plaques” that build up in Alzheimer’s patients appeared to have gone from the brains of those given the highest doses of the antibody.
The scientists, who described their results in a paper in the jounal natural, also said the patients showed signs that the rate of their cognitive decline had slowed.
The findings of the trial suggest the plaques are at least part of the cause of the disease – not simply a byproduct.
And, if the results are confirmed in larger clinical trials already under way around the world, one expert said it could be a “game-changer” for efforts to prevent Alzheimer’s.
One of the researchers, Professor Roger Nitsch, of Zurich University, described what they found when they scanned the brains of patients given either a placebo or three different doses of the antibody, called aducanumab.
“One year later, the images of the placebo group are basically unchanged. In the three doses groups, a very clear reduction in amyloid plaques is shown – the higher the dose, the larger the degree of reduction,”
“In the 10mg dose group, after one year you can see no red on the image, meaning the amyloid has almost completely disappeared.
“Compared to other studies published in the past, the effect size of this drug is unprecedented.”
Commenting on the research in a separate Nature article, Professor Eric Reiman, of The University of Arizona, wrote: “If these preliminary cognitive findings are confirmed in larger and more-definitive clinical trials, which are now under way, it would provide a shot in the arm in the fight against Alzheimer’s disease.
“But although the authors’ additional cognitive findings are encouraging, they are not definitive. It would be prudent to withhold judgement about aducanumab’s cognitive benefit until results from the larger trials are in.”
But he added: “Confirmation that an anti-amyloid plaque treatment slows cognitive decline would be a game-changer for how we understand, treat and prevent Alzheimer’s disease.
“Now is the time to find out.”
The study, led by scientists at pharmaceutical companies Biogen and Neurimmune, sparked major interest from experts in the field.
Dr Tara Spires-Jones, interim director of Edinburgh University’s Centre for Cognitive and Neural Systems, said the research showed the antibody “robustly reduced amyloid pathology in a small group of people in very early stages of the disease”.
“These results are the most detailed and promising that we’ve seen for a drug that aims to modify the underlying causes of Alzheimer’s disease.
“The study showed that the drug was first able to remove clumps of amyloid – a toxic protein associated with Alzheimer’s – from the brain of mice and also, excitingly, in people.
Resource Independent
Tiada ulasan:
Catat Ulasan