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The finding could boost
Alzheimer's, Parkinson's disease research, experts say
Researchers believe they've found a link between the cellular
stress caused by free radical molecules and the accumulation of
misfolded proteins that may cause neurodegenerative
conditions such as Alzheimer's and Parkinson's disease.
A team at
the Burnham Institute for Medical Research in La Jolla, Calif.,
found that overproduction of oxidizing free radicals,
specifically nitric oxide (NO), causes inhibition of Protein
Disulphide Isomerase (PDI) -- a "chaperone" protein that's
necessary for proper protein folding in times of cellular
stress.
Inhibition of PDI reduces its neuroprotective benefits for nerve
cells, the researchers explained in the May 25 issue of
Nature.
The
researchers said this is the first study documenting a direct
link between NO free radicals and protein misfolding, which is
believed to be a common pathway in the development of nearly all
neurodegenerative diseases. The finding may help lead to the
development of new treatments for these diseases.
"Our data
demonstrate a previously unrecognized relationship between NO
and protein misfolding in degenerative disorders, showing that
PDI can be a target of NO in cellular models of Parkinson's
disease and human neurodegenerative disease," senior author Dr.
Stuart A. Lipton, director of the Del E. Webb Center for
Neurosciences and Aging at the Burnham Institute, said in a
prepared statement.
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