Brain changes linked with Alzheimer

Ad Details

  • Ad ID: 5099

  • Added: May 15, 2019

  • Views: 73

Description

Brain changes linked with Alzheimer


In a records review of 290 people at risk for Alzheimer’s disease, scientists at Johns Hopkins say they have identified an average level of biological and anatomical brain changes linked to Alzheimer’s disease that occur three to 10 years — some even more than 30 years — before the disease’s first recognizable symptoms appear.

“Our study suggests it may be possible to use brain imaging and spinal fluid analysis to assess risk of Alzheimer’s disease at least 10 years or more before the most common symptoms, such as mild cognitive impairment, occur,” says Laurent Younes, Ph.D., professor and chair of the Department of Applied Mathematics and Statistics at The Johns Hopkins University. A report of their findings was published online April 2 in Frontiers in Aging Neuroscience.

Younes cautions that brain changes vary widely in people, and that their research findings reflect an average level of such changes in a small group of research subjects. As a result, he says, the scientists cannot yet use them to draw any precise conclusions about brain changes in individual people. Nor, they say, are there any drug or other interventions yet known to slow or stop the disease process even if risk is identified early. But the work, he adds, could lead eventually to a test to determine an individual’s relative risk for Alzheimer’s disease and to guide the use of treatments when and if they are developed.

For the study, the scientists reviewed medical records collected from 290 people age 40 and older by the National Institutes of Health and the Johns Hopkins University School of Medicine as part of the BIOCARD project, an effort to develop predictors of cognitive decline. It is currently directed by Johns Hopkins neurologist Marilyn Albert, Ph.D.

Most of the 290 people had at least one first degree relative with dementia of the Alzheimer’s disease type, putting them at higher than usual risk.

As part of the BIOCARD studies, scientists collected cerebrospinal fluid and performed MRI brain scans of study participants every two years between 1995 and 2005. They also conducted five standard tests of memory, learning, reading and attention annually from 1995 to 2013.

Because all 290 participants were cognitively normal when the study began, the scientists were able to track various biological and clinical features associated with Alzheimer’s disease in the years leading up to the appearance of symptoms. By the time of their last appointment with the BIOCARD project, 209 study participants remained cognitively normal, and 81 were diagnosed with mild cognitive impairment or dementia due to Alzheimer’s disease.

In the 81 people who developed cognitive problems or dementia, the Johns Hopkins team found subtle changes in cognitive test scores 11 to 15 years before the onset of clear cognitive impairment. They also found increases in the rate of change of a protein called Tau, which has long been considered a marker of Alzheimer’s disease, in cerebrospinal fluid an average of 34.4 years (for t-tau, or total Tau) and 13 years (for a modified version called p-tau) before the beginning of cognitive impairment.

Story Source:

Materials provided by Johns Hopkins Medicine. Note: Content may be edited for style and length.



Source link

Information:

The purpose of our website is only to help students to assist, guide and aware them regarding material available. Moreover, it is necessary for you to take the permission if you want to reproduce or commercial purpose.

*All the rights reserved by Developer and Translator.

Help Us Improve This Article

Did you find an inaccuracy? We work hard to provide accurate and scientifically reliable information. If you have found an error of any kind, please let us know.

Add comment. we appropriate your effort.

Share with Us

If you have any scale or any material related to psychology kindly share with us on psychologyroots@gmail.com. We help others on behalf of you.

Comments

Leave a Comment

Your email address will not be published. required fields are marked *

Success! Thanks for your comment. We appreciate your response.
You might have left one of the fields blank, or be posting too quickly