MedicineWorld.Org
Your gateway to the world of medicine
Home
News
Cancer News
About Us
Cancer
Health Professionals
Patients and public
Contact Us
Disclaimer

Medicineworld.org: Protein plaques implicated in Alzheimer's

Back to cancer blog Blogs list Cancer blog  


Subscribe To Cancer Blog RSS Feed  RSS content feed What is RSS feed?

Protein plaques implicated in Alzheimer's




For unknown reasons a protein called amyloid beta aggregates into toxic plaques in the brain, killing neurons. These plaques are one of the hallmarks of Alzheimers disease. Now two new animal studies show for the first time that the deadly transformation of amyloid beta into plaques can be prevented through an interaction between amyloid beta and another protein called cystatin C.



Protein plaques implicated in Alzheimer's
Alzheimer' tangles

Eventhough much work needs to be done, these new findings may open the door to new therapys for Alzheimers disease that mimic the effects of cystatin C, says Efrat Levy, Ph.D., Associate Professor in the Departments of Psychiatry and Pharmacology at New York University School of Medicine, and the lead author of the study. We are really excited by these findings because recent studies show that cystatin C is protective against a variety of insults that cause cell death in the brain. Our potential therapeutic approach focuses on keeping amyloid beta in a water soluble form, preventing its accumulation in the brain, and thus slowing, halting, or reversing disease progression, says Dr. Levy, who is also Director of the Laboratory of Molecular Pathology of Cerebral Amyloidosis at the Nathan S. Kline Institute for Psychiatric Research in Orangeburg, New York.

With support from the Alzheimers Association, Dr. Levys laboratory has already begun studies to develop a drug that will mimic the ability of cystatin C to bind to a non-pathological form of amyloid beta and thereby prevent its accumulation into plaques in the brain.

Alzheimers is estimated to affect 5 million Americans and there are no medicines that can delay or prevent the disease. A number of laboratories worldwide are pursuing ways to prevent the clumping of amyloid beta as possible therapies for the disease. It isnt known whether the protein actually causes Alzheimers, but amyloid beta is one of the proteins implicated in the disease process.

The two studies appear in the on-line November 18, 2007, edition of the journal Nature Genetics and will be published in its December 2007 issue.

The first study waccording toformed by Dr. Levy in collaboration with other researchers at the Nathan S. Kline Institute for Psychiatric Research and New York University School of Medicine. The second study waccording toformed by Dr. Levy and his colleagues in the laboratory of Dr. Mathias Jucker at the Hertie-Institute for Clinical Brain Research in Tubingen, Gera number of.

Both studies used mice that were genetically engineered to produce human cystatin C as well as abundant amounts of amyloid beta plaques in their brains. The cystatin C bound to the soluble, non-pathological form of amyloid beta in these mice and inhibited the aggregation and deposition of amyloid beta plaques in the brain.

The research shows that cystatin C binds soluble amyloid beta also in the human brain, and suggests that this binding inhibits its aggregation into insoluble plaques in humans, says Dr. Levy. Cystatin C production and body fluid levels vary among healthy individuals and can be influenced by certain hormones, aging, and certain pathological conditions, she says. Furthermore, it was recently demonstrated that a genetic variation in the cystatin C gene in human populations is associated with a greater risk of developing Alzheimers disease during aging.

These findings suggest, says Dr.Levy, that even subtle modifications of cystatin C protein levels could affect amyloid beta accumulation and deposition in the brain, thereby modifying disease progression.

Cystatin C is found in all body fluids and tissues of mammals. It is a jack-of-all-trades, playing a broad role in a number of functions, including cell proliferation and growth, modulation of the inflammatory response, and bone resorption. The protein also has been implicated in neuronal degeneration and repair of the nervous system.

The work of Dr. Levy and his colleagues offers important insights into how cystatin C may lower the risk for Alzheimers disease, setting the stage for a new approach to treatment, said Ralph A. Nixon, M.D., Ph.D., Professor of Psychiatry and Cell Biology at NYU School of Medicine and Director of the Center for Dementia Research at the Nathan S. Kline Institute. Dr. Nixon also directs the Silberstein Institute at NYU School of Medicine.

Given the increasing prevalence of this disease, its staggering social and economic costs for patients and their families, and the limitations of existing therapies, we are very hopeful that this research will lead to improved medications to prevent the disease and forestall its devastating symptoms, said Dr. Harold S. Koplewicz, Director of the Nathan S. Kline Institute, and the Chair of the Department of Child and Adolescent Psychiatry and a Vice-Dean at NYU School of Medicine.


Posted by: Janet    Source




Did you know?
For unknown reasons a protein called amyloid beta aggregates into toxic plaques in the brain, killing neurons. These plaques are one of the hallmarks of Alzheimers disease. Now two new animal studies show for the first time that the deadly transformation of amyloid beta into plaques can be prevented through an interaction between amyloid beta and another protein called cystatin C.

Medicineworld.org: Protein plaques implicated in Alzheimer's

Main Page| Cancer blog| Cancer blogs list| Lung cancer blog| Colon cancer blog| Prostate cancer blog| Breast cancer blog| Diabetes watch blog| Heart watch blog| Allergy blog| Bladder cancer blog| Cervical cancer blog| Colon cancer news blog| Diabetes news blog| Esophageal cancer blog| Gastric cancer blog| Health news blog| Heart news blog| Infectious disease blog| Kidney watch blog| Lung disease blog| Lung cancer news blog| Mesothelioma blog| Neurology blog| Breast cancer news blog| OBGYN blog| Ophthalmology blog| Ovarian cancer blog| Cancer news blog| Pancreas cancer blog| Pediatrics blog| Prostate cancer news blog| Psychology blog| Research blog| Rheumatology blog| Society news blog| Uterine cancer blog| Weight watch blog|

Copyright statement
The contents of this web page are protected. Legal action may follow for reproduction of materials without permission.