As the largest resource of information specific to women's brain health, we are sure you will find what you are looking for, and promise that you will discover new information.
Published on: May 7, 2012
by Kate Kelland for Reuters
British researchers writing in the journal Nature said they had found a major pathway leading to brain cell death in mice with prion disease, the mouse equivalent of Creutzfeld-Jacob Disease (CJD).
They then worked out how to block it, and were able to prevent brain cells from dying, helping the mice live longer.
The finding, described by one expert as “a major breakthrough in understanding what kills neurons”, points to a common mechanism by which brain diseases such as Alzheimer’s, Parkinson’s and CJD damage the nerve cells.
In neurodegenerative diseases, proteins “mis-fold” in a various ways, leading to a buildup of misshapen proteins, the researchers explained in the study. These misshapen proteins form the plaques found in the brains of patients with Alzheimer’s and the Lewy bodies found in Parkinson’s disease.
“What’s exciting is the emergence of a common mechanism of brain cell death, across a range of different neurodegenerative disorders, activated by the different mis-folded proteins in each disease,” said Giovanna Mallucci, who led the research at the University of Leicester’s toxicology unit.
“The fact that in mice with prion disease we were able to manipulate this mechanism and protect the brain cells means we may have a way forward in how we treat other disorders,” she said in a statement about the work.
An estimated 18 million people worldwide suffer from Alzheimer’s, and Parkinson’s is thought to affect around one in 100 people over the age of 60. In these diseases, neurons in the brain die, destroying the brain from the inside.
But why the neurons die has remained an unsolved mystery, presenting an obstacle to developing effective treatments and to being able to diagnose the illnesses at early stages when medicines might work better.
Mallucci’s team found that the buildup of mis-folded proteins in the brains of mice with prion disease activated a natural defense mechanism in cells, which switches off the production of new proteins.
This would normally switch back on again, the researchers explained, but in these ill mice the continued build-up of misshapen proteins keeps the switch turned off. This is the trigger point leading to brain cell death, because key proteins essential for cell survival are not made.
By injecting a protein that blocks the “off” switch, the scientists were able to restore the production of the survival proteins and halt the neurodegeneration.
They found the brain cells were protected, protein levels were restored and synaptic transmission – the way brain cells signal to each other – was re-established. The mice also lived longer, even though only a very small part of their brains had been treated.
Eric Karran, director of research at the charity Alzheimer’s Research UK, said while the research was still at an early stage, the results were exciting.
“While neurodegenerative diseases can have many different triggers, this study suggests that they may act through a common mechanism to damage nerve cells. The findings present the appealing concept that one treatment could have benefits for a range of different diseases,” he said.
Roger Morris, a professor of molecular neurobiology at King’s College London who was not involved in the work, said the finding was “a major breakthrough in understanding what kills neurons in neurodegenerative disease”.
“There are good reasons for believing this response, identified with prion disease, applies also to Alzheimer’s and other neurodegenerative diseases,” he said.
Picture: One hemisphere of a healthy brain (L) is pictured next to one hemisphere of a brain of a person suffering from Alzheimer disease, at the Morphological unit of psychopathology in the Neuropsychiatry division of the Belle Idee University Hospital in Chene-Bourg near Geneva March 14, 2011.
A new comprehensive study from Florida State University (FSU) finds no evidence to support the idea that personality changes begin before the clinical onset of mild cognitive impairment (MCI) or dementia. MCI is an intermediate...
On the evening of Monday November 27th, join us for conversation and cocktails with award-winning journalist, editor and author Tina Brown, and Indigo’s CEO Heather Reisman. Hear from Tina Brown about her eight-year tenure at Vanity...
The presence of TAR DNA-binding protein 43 (TDP-43) in the hippocampus on postmortem examination is associated with increased rates of hippocampal atrophy in patients with Alzheimer’s disease (AD), new research suggests. This association was greatest...
The material presented through the Think Tank feature on this website is in no way intended to replace professional medical care or attention by a qualified practitioner. WBHI strongly advises all questioners and viewers using this feature with health problems to consult a qualified physician, especially before starting any treatment. The materials provided on this website cannot and should not be used as a basis for diagnosis or choice of treatment. The materials are not exhaustive and cannot always respect all the most recent research in all areas of medicine.