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Hitting 'reset' in protein synthesis restores myelination
Date:4/26/2013

hese diseases significantly affect quality of life but not longevity, taking a major toll on patients, families and society, the researchers note.

"It's possible that our finding could lead to the development of an effective treatment not just for CMT neuropathies but also for other diseases related to misfolded proteins," says Lawrence Wrabetz, MD, director of the institute and professor of neurology and biochemistry in UB's School of Medicine and Biomedical Sciences and senior author on the paper. Maurizio D'Antonio, of the Division of Genetics and Cell Biology of the San Raffaele Scientific Institute in Milan is first author; Wrabetz did most of this research while he was at San Raffaele, prior to coming to UB.

The research finding centers around the synthesis of misfolded proteins in Schwann cells, which make myelin in nerves. Myelin is the crucial fatty material that wraps the axons of neurons and allows them to signal effectively. Many CMT neuropathies are associated with mutations in a gene known as P0, which glues the wraps of myelin together. Wrabetz has previously shown in experiments with transgenic mice that those mutations cause the myelin to break down, which in turn, causes degeneration of peripheral nerves and wasting of muscles.

When cells recognize that the misfolded proteins are being synthesized, cells respond by severely reducing protein production in an effort to correct the problem, Wrabetz explains. The cells commence protein synthesis again when a protein called Gadd34 gets involved.

"After cells have reacted to, and corrected, misfolding of proteins, the job of Gadd34 is to turn protein synthesis back on," says Wrabetz. "What we have shown is that once Gadd34 is turned back on, it activates synthesis of proteins at a level that's too highthat's what causes more problems in myelination.

"We have provided proof of principle that Gadd34 causes a problem with translational homeostasis and that's what causes some neuropathi
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Contact: Ellen Goldbaum
goldbaum@buffalo.edu
716-645-4605
University at Buffalo
Source:Eurekalert

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