Navigation Links
Abnormal Protein May Explain Loss of Smell With Alzheimer's
Date:9/29/2011

THURSDAY, Sept. 29 (HealthDay News) -- A loss of a sense of smell can be one of the earliest signs of Alzheimer's disease.

New research suggests that an abnormal form of a protein -- amyloid precursor protein, or APP -- which has been previously associated with the Alzheimer's disease may be to blame.

A study in mice found that animals genetically engineered to produce high levels of the abnormal protein experienced high levels of death in nerve cells in their nose compared to normal mice.

Researchers say the findings may explain why people suffering from the progressive illness often lose their sense of smell while the disease is still in its initial stages. They added this new insight might help doctors detect the condition early on.

"Deficits in odor detection and discrimination are among the earliest symptoms of Alzheimer's disease, suggesting that the sense of smell can potentially serve as a canary in the coal mine for early diagnosis of the disease," study leader Leonardo Belluscio of the U.S. National Institute of Neurological Disorders and Stroke, said in a news release.

"The changes taking place in the olfactory system as a result of Alzheimer's disease may be similar to those in other regions of the brain but appear more rapidly," he added.

APP has been detected in the nose nerve cells of some people with early onset Alzheimer's, a rare form of the disease that runs in families and strikes before age 65.

The researchers found mice making the mutated form of APP had four times as much olfactory nerve cell death at three weeks of age than normal mice.

When researchers blocked the production of high levels of the mutated protein, more olfactory nerve cells survived.

"Reducing APP production suppressed the widespread loss of nerve cells, suggesting that such disease-related death of nerve cells could potentially be stopped," explained Belluscio.

The study, published in the Sept. 28 issue of The Journal of Neuroscience, also found that the cells that died in the nose did not contain amyloid plaques, which are derived from APP. Plaques have long been believed to contribute to the death of nerve cells in the brains of people with Alzheimer's, leading to memory loss.

The researchers say the findings suggest that APP itself may be responsible for the death of nerve cells.

"Together, these results support the hypothesis that amyloid proteins are involved in the degeneration of the brain that occurs with Alzheimer's disease," Donald Wilson of New York University School of Medicine and the Nathan Kline Institute for Psychiatric Research, said in a news release from the journal.

"Further, they provide an exciting opportunity to explore how to prevent or reverse the events that lead to cell death and, ultimately, dementia," added Wilson, an olfactory system expert who was not involved in the study.

While more research is needed, it should be noted that studies involving animals often fail to produce similar results with humans.

More information

The National Institutes of Health provides more information on Alzheimer's disease.

-- Mary Elizabeth Dallas

SOURCE: Society for Neuroscience, news release, Sept. 27, 2011


'/>"/>
Copyright©2010 ScoutNews,LLC.
All rights reserved

Related medicine news :

1. New study finds 70 percent of able-bodied hockey players have abnormal hip and pelvis MRIs
2. Autism Consortium study in Pediatrics shows CMA finds more genetic abnormalities than current tests
3. Mount Sinai researchers are the first to identify heart abnormalities in World Trade Center workers
4. Researchers ID brain abnormalities in children exposed to methamphetamine in utero
5. Abnormal Heart Rhythm Linked to Alzheimers
6. High doses of antioxidant supplements induce stem cell genetic abnormalities
7. Visually guided laser may be viable treatment for abnormal heartbeat
8. Cold sore virus may contribute to cognitive and brain abnormalities in schizophrenia
9. Harmless Brain Abnormalities in Kids Pose Disclosure Dilemmas
10. Specially trained nurse practitioner detected same breast abnormalities as surgeon
11. Abnormal brain activity in migraineurs is not restricted to attacks
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:6/25/2016)... ... 25, 2016 , ... On Friday, June 10, Van Mitchell, Secretary of the ... to iHire in recognition of their exemplary accomplishments in worksite health promotion. , The ... Health & Wellness Symposium at the BWI Marriott in Linthicum Heights. iHire was one ...
(Date:6/24/2016)... ... 2016 , ... June 19, 2016 is World Sickle Cell Observance Day. In ... benefits of holistic treatments, Serenity Recovery Center of Marne, Michigan, has issued ... Sickle Cell Disease (SCD) is a disorder of the red blood cells, which can ...
(Date:6/24/2016)... ... 24, 2016 , ... Dr. Amanda Cheng, an orthodontist ... has extensive experience with all areas of orthodontics, including robotic Suresmile technology, ... , Micro-osteoperforation is a revolutionary adjunct to orthodontic treatment. It can be used ...
(Date:6/24/2016)... ... June 24, 2016 , ... EB Medicine presented ... in Emergency Medicine conference in Ponte Vedra Beach, FL. The awards honor the ... Emergency Medicine Practice and Pediatric Emergency Medicine Practice. , “With this award, ...
(Date:6/24/2016)... ... , ... National recruitment firm Slone Partners is pleased to announce ... experience, as Vice President of North American Capital Sales at HTG Molecular . ... sales team in the commercialization of the HTG EdgeSeq system and associated reagents in ...
Breaking Medicine News(10 mins):
(Date:6/23/2016)... June 23, 2016 Research and Markets ... Medical Market Analysis 2016 - Forecast to 2022" report ... The report contains up to date financial data derived from ... of major trends with potential impact on the market during ... market segmentation which comprises of sub markets, regional and country ...
(Date:6/23/2016)... INDIANAPOLIS , June 23, 2016 /PRNewswire/ ... Diabetes Tomorrow,s Leaders Scholarship is any indication, the future ... today online at www.diabetesscholars.org by the Diabetes ... stand in the way of academic and community service ... scholarship program since 2012, and continues to advocate for ...
(Date:6/23/2016)... , June 23, 2016 Research ... "Surgical Procedure Volumes: Global Analysis (United States, China, Japan, ... report to their offering. ... tool for healthcare business planners, provides surgical procedure volume ... surgery trends with an in-depth analysis of growth drivers ...
Breaking Medicine Technology: