Is Alzheimer’s Really a Brain Disease? New Theory Challenges Conventional Wisdom
The quest for an Alzheimer’s cure has become increasingly competitive and controversial. In July 2022, Science magazine reported that a pivotal 2006 research paper in Nature, which identified beta-amyloid as the cause of Alzheimer’s, may have been based on fabricated data. Just a year earlier, in June 2021, the FDA approved aducanumab, an antibody targeting beta-amyloid, for Alzheimer’s treatment, despite incomplete and contradictory data. Some physicians question its approval, while others argue it deserves a chance.
Why is progress so slow in finding a cure for Alzheimer’s, a disease affecting millions? Scientists have long focused on beta-amyloid, a protein linked to Alzheimer’s, but this approach has not yet yielded effective treatments. A shift in thinking is needed.
At the Krembil Brain Institute, part of the University Health Network in Toronto, we are developing a new theory. We no longer view Alzheimer’s as primarily a brain disease but as a disorder of the brain’s immune system. This system, present in every organ, helps repair injuries and protect against invaders. The same processes occur in the brain, where it helps repair damage and combat infections.
We propose that beta-amyloid, rather than being a harmful protein, is a normal part of the brain’s immune response. However, due to similarities between bacterial and brain cell membranes, beta-amyloid mistakenly attacks brain cells, leading to chronic damage and dementia. In this view, Alzheimer’s is an autoimmune disease where the immune system misdirects its attack.
Unlike other autoimmune diseases, conventional steroid-based therapies may not be effective for Alzheimer’s. Instead, targeting other immune-regulating pathways in the brain might offer new treatment approaches.
Other theories about Alzheimer’s are emerging. Some suggest it involves mitochondria, the brain’s energy factories, while others propose it could result from brain infections or abnormal metal handling.
With over fifty million people affected by dementia worldwide, and a new diagnosis every three seconds, innovative approaches and fresh perspectives are crucial. Understanding Alzheimer’s better is essential for improving treatments and supporting affected individuals and their families.
Donald Weaver, Professor of Chemistry and Director of Krembil Research Institute, University Health Network, University of Toronto
Source: Is Alzheimer’s Really a Brain Disease? New Theory Challenges Conventional Wisdom
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