News Release

MAO is a possible Alzheimer's disease biomarker

Peer-Reviewed Publication

American Chemical Society

Enzyme Could Be Alzheimer's Disease Biomarker

image: Researchers used mice studies to reveal that MAO activity (yellow) is directly correlated with the progression of Alzheimer's disease and may be used to stage the disease. view more 

Credit: American Chemical Society

Alzheimer’s disease affects more than 35 million people, a number that is expected to increase in the coming years. Currently, Alzheimer’s diagnoses rely on clinical neuropathologic assessment of amyloid-β (Aβ) peptide aggregates (plaques) and neurofibrillary tangles. But in ACS Central Science, researchers reveal that an enzyme already implicated in a host of neural disorders could someday serve as a biomarker.

In the brains of patients with Alzheimer’s, amyloid peptides aggregate to form oligomers and plaques that are thought to be responsible for the disease symptoms. It is difficult to monitor Aβ aggregation in living animals and patients, and current methods to track it in patient brains are costly, have low resolution or require radiation. Monoamine oxidase (MAO) is involved in many neurological disorders, such as depression. In addition, MAO is known to be associated with Alzheimer’s, but studies establishing this relationship were only conducted in lab dishes and test tubes. To better understand MAO’s association with Alzheimer’s, and to determine whether MAO levels could be used as a biomarker for the disease, Inhee Mook-Jung, Kyo Han Ahn and colleagues took the next step and studied the protein in a mouse model of Alzheimer’s.

The team devised an imaging tool to watch both Aβ and MAO at the same time in mice, and observed that as Aβ plaques increase (that is, as Alzheimer’s progresses), MAO activity also increases. The team also showed that there are three distinct phases of MAO activity that change along with Alzheimer’s progression: a slow initiation stage, a subsequent aggressive stage and finally a saturation stage. The authors say these results suggest that MAO could be helpful as a biomarker to someday diagnose and monitor the disease in patients, possibly using body fluids.

###

The authors acknowledge funding from the Ministry of Health & Welfare, the National Research Foundation of Korea and the University of California, San Diego.

The paper will be freely available on December 7th, at this link: http://pubs.acs.org/doi/full/10.1021/acscentsci.6b00309

The American Chemical Society is a nonprofit organization chartered by the U.S. Congress. With nearly 157,000 members, ACS is the world's largest scientific society and a global leader in providing access to chemistry-related research through its multiple databases, peer-reviewed journals and scientific conferences. Its main offices are in Washington, D.C., and Columbus, Ohio.

To automatically receive news releases from the American Chemical Society, contact newsroom@acs.org.

Follow us: Twitter Facebook


Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.