Could Angry Birds stave off Alzheimer’s?
January 24, 2012
• UC Berkeley scientists find biological target of disease
• ‘There is no downside to cognitive activity. It can only be beneficial’
Could playing the video game Angry Birds, along with reading, writing or similar activities, stave off Alzheimer’s disease by preventing a build up in the brain of beta-amyloid, a destructive protein that is the hallmark of the disease?
University of California, Berkeley, researchers believe they have found the biological target at play in the mentally disabling illness. The discovery could guide future research into effective prevention strategies, the university says.
“These findings point to a new way of thinking about how cognitive engagement throughout life affects the brain,” says the study’s principal investigator, William Jagust, a professor with joint appointments at UC Berkeley’s Helen Wills Neuroscience Institute, the School of Public Health and Lawrence Berkeley National Laboratory.
“Rather than simply providing resistance to Alzheimer’s, brain-stimulating activities may affect a primary pathological process in the disease,” he says. “This suggests that cognitive therapies could have significant disease-modifying treatment benefits if applied early enough, before symptoms appear.”
The study provides even more reason for people to read a book or do a puzzle, and to make such activities a lifetime habit. Brain scans revealed that people with no symptoms of Alzheimer’s who engaged in cognitively stimulating activities throughout their lives had fewer deposits of beta-amyloid.
An estimated 5.4 million Americans live with Alzheimer’s disease, but the numbers are growing as baby boomers age. Between 2000 and 2008, deaths from Alzheimer’s increased 66 percent, making it the sixth-leading killer in the country. There is currently no cure, but a draft of the first-ever National Alzheimer’s Plan, released this week, revealed that the U.S. government is aiming for effective Alzheimer’s treatments by 2025.
The new study, published Jan. 23 in the Archives of Neurology, puts the spotlight on amyloid – protein fibers folded into tangled plaques that accumulate in the brain. Beta-amyloid is considered the top suspect in the pathology of Alzheimer’s disease, so finding a way to reduce its development has become a major new direction of research.
The researchers note that the buildup of amyloid can also be influenced by genes and aging – one-third of people age 60 and over have some amyloid deposits in their brain – but how much reading and writing one does is under each individual’s control.
“This is the first time cognitive activity level has been related to amyloid buildup in the brain,” says study lead author Susan Landau, research scientist at the Helen Wills Neuroscience Institute and the Berkeley Lab. “Amyloid probably starts accumulating many years before symptoms appear. So it’s possible that by the time you have symptoms of Alzheimer’s, like memory problems, there is little that can be done to stop disease progression. The time for intervention may be much sooner, which is why we’re trying to identify whether lifestyle factors might be related to the earliest possible changes.”
Notably, the researchers did not find a strong connection between amyloid deposition and levels of current cognitive activity alone.
“What our data suggests is that a whole lifetime of engaging in these activities has a bigger effect than being cognitively active just in older age,” says Ms. Landau.
The researchers are careful to point out that the study does not negate the benefits of kicking up brain activity in later years.
“There is no downside to cognitive activity. It can only be beneficial, even if for reasons other than reducing amyloid in the brain, including social stimulation and empowerment,” says Mr. Jagust. “And actually, cognitive activity late in life may well turn out to be beneficial for reducing amyloid. We just haven’t found that connection yet.”
How the research was done
The researchers asked 65 healthy, cognitively normal adults aged 60 and over (average age was 76) to rate how frequently they participated in such mentally engaging activities as going to the library, reading books or newspapers, and writing letters or email. The questions focused on various points in life from age 6 to the present.
The participants took part in extensive neuropsychological testing to assess memory and other cognitive functions, and received positron emission tomography (PET) scans at the Berkeley Lab using a new tracer called Pittsburgh Compound B that was developed to visualize amyloid. The results of the brain scans of healthy older individuals with various levels of lifetime cognitive activity were compared with those of 10 patients diagnosed with Alzheimer’s disease and 11 healthy people in their 20s.
The researchers found a significant association between higher levels of cognitive activity over a lifetime and lower levels of beta-amyloid in the PET scans. They analyzed the impact of other factors such as memory function, physical activity, self-rated memory ability, level of education and gender, and found that lifelong cognitive engagement was independently linked to amyloid deposition.
Other study authors include researchers from UC San Francisco’s Memory and Aging Center and Department of Neurology, and Rush University Medical Center’s Alzheimer’s Disease Center in Chicago.
The National Institutes of Health and the Alzheimer’s Association helped support this research.