Navigation Links
Cancer drug prevents build-up of toxic brain protein
Date:5/9/2013

WASHINGTON Researchers at Georgetown University Medical Center have used tiny doses of a leukemia drug to halt accumulation of toxic proteins linked to Parkinson's disease in the brains of mice. This finding provides the basis to plan a clinical trial in humans to study the effects.

They say their study, published online May 10 in Human Molecular Genetics, offers a unique and exciting strategy to treat neurodegenerative diseases that feature abnormal buildup of proteins in Parkinson's disease, Alzheimer's disease, amyotrophic lateral sclerosis (ALS), frontotemporal dementia, Huntington disease and Lewy body dementia, among others.

"This drug, in very low doses, turns on the garbage disposal machinery inside neurons to clear toxic proteins from the cell. By clearing intracellular proteins, the drug prevents their accumulation in pathological inclusions called Lewy bodies and/or tangles, and also prevents amyloid secretion into the extracellular space between neurons, so proteins do not form toxic clumps or plaques in the brain," says the study's senior investigator, neuroscientist Charbel E-H Moussa, MB, PhD. Moussa heads the laboratory of dementia and Parkinsonism at Georgetown.

When the drug, nilotinib, is used to treat chronic myelogenous leukemia (CML), it forces cancer cells into autophagy a biological process that leads to death of tumor cells in cancer.

"The doses used to treat CML are high enough that the drug pushes cells to chew up their own internal organelles, causing self-cannibalization and cell death," Moussa says. "We reasoned that small doses for these mice, an equivalent to one percent of the dose used in humans would turn on just enough autophagy in neurons that the cells would clear malfunctioning proteins, and nothing else."

Moussa, who has long sought a way to force neurons to clean up their garbage, came up with the idea of using cancer drugs that push autophagy in tumors to help diseased brains. "No one has tried anything like this before," he says.

Moussa, and his two co-authors graduate student Michaeline Hebron and Irina Lonskaya, PhD, a postdoctoral researcher in Moussa's lab searched for cancer drugs that can cross the blood-brain barrier. They discovered two candidates nilotinib and bosutinib, which is also approved to treat CML. This study discusses experiments with nilotinib, but Moussa says that use of bosutinib is also beneficial.

The mice used in this study over-express alpha-Synuclein, the protein that builds up in Lewy bodies in Parkinson's disease and dementia patients and which is found in many other neurodegenerative diseases. The animals were given one milligram of nilotinib every two days. (By contrast, the FDA approved use of up to 1,000 milligrams of nilotinib once a day for CML patients.)

"We successfully tested this for several diseases models that have an accumulation of intracellular protein," Moussa says. "It gets rid of alpha synuclein and tau in a number of movement disorders, such as Parkinson's disease as well as Lewy body dementia."

The team also showed that movement and functionality in the treated mice was greatly improved, compared with untreated mice.

In order for such a therapy to be as successful as possible in patients, the agent would need to be used early in neurodegenerative diseases, Moussa hypothesizes. Later use might retard further extracellular plaque formation and accumulation of intracellular proteins in inclusions such as Lewy bodies.

Moussa is planning a phase II clinical trial in participants who have been diagnosed with disorders that feature build-up of alpha Synuclein, including Lewy body dementia, Parkinson's disease, progressive supranuclear palsy (PSP) and multiple system atrophy (MSA).


'/>"/>

Contact: Karen Mallet
km463@georgetown.edu
Georgetown University Medical Center
Source:Eurekalert

Related medicine news :

1. Study Suggests Vaccine May Help Kids With Brain Cancer
2. New Stool Test Might Aid in Early Detection of Colon Cancer
3. Study reveals how cancer drug causes diabetic-like state
4. How a cancer drug leads to diabetes
5. You Survived Cancer: Now Pay Attention to Your Overall Health
6. New drug prevents spread of human prostate cancer cells
7. Eliminating the good cholesterol receptor may fight breast cancer
8. Taller, Heavier Women May Face Higher Ovarian Cancer Risk
9. Experimental Chemo Combo for Colon Cancer Disappoints
10. Veggies Like Broccoli, Cabbage May Help Fight Breast Cancer: Study
11. Targeted therapeutics for colon cancer to be presented at AACR meeting
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:11/30/2016)... ... November 30, 2016 , ... The Fertility Centers of ... a Cigna Infertility Center of Excellence. The Cigna Center of Excellence recognizes participating ... honor to be designated a Cigna Infertility Center of Excellence," said Fertility Centers ...
(Date:11/30/2016)... ... 2016 , ... "I hate when the mixture of saliva and toothpaste runs ... inventor from Bridgewater, N.J. "I thought that there had to be a way to ... the patent-pending DEFLECTOR to prevent saliva and toothpaste from running down the brush handle ...
(Date:11/30/2016)... ... November 30, 2016 , ... Center For Discovery, ... the opening of a new eating disorder treatment center location in Palm Beach ... adults and adolescents, both males and females ages 10 and older with eating ...
(Date:11/30/2016)... MA (PRWEB) , ... November 30, 2016 , ... ... for treating injured workers have been a focus of public policymakers and system ... Compensation Research Institute (WCRI) released its Medical Price Index for Workers’ Compensation, ...
(Date:11/30/2016)... ... November 30, 2016 , ... The Clinical Data Interchange Standards ... Binding Guidance goes into effect next month. Sponsors whose studies start after December ... Standards Catalog. The current FDA Data Standards Catalog specifies the use of CDISC ...
Breaking Medicine News(10 mins):
(Date:12/2/2016)... bioLytical Laboratories (das "Unternehmen"), ein Weltführer bei schnellen ... HIV-Selbsttests  in einer Version mit geringeren Kosten einzuführen.  ... ... New: INSTI Self Test! (PRNewsFoto/bioLytical Laboratories) ...      (Photo: http://photos.prnewswire.com/prnh/20161201/444833 ) ...
(Date:11/30/2016)... Research and Markets has announced the addition of the ... report to their offering. ... The cerebrospinal fluid (CSF) acts as ... is circulated though the brain and its ventricles, the spine and the ... the brain changes significantly. As a result, intracranial ...
(Date:11/30/2016)...  Millennium Dental Technologies, Inc. announced that it has again ... of the State of California , County ... California,s Uniform Trade Secrets act, Unfair ... practices which are untrue and misleading, as well as other ... the second time in three years that Millennium found it ...
Breaking Medicine Technology: