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Shingles symptoms may be caused by neuronal short circuit
Date:9/10/2013

The pain and itching associated with shingles and herpes may be due to the virus causing a "short circuit" in the nerve cells that reach the skin, Princeton researchers have found.

This short circuit appears to cause repetitive, synchronized firing of nerve cells, the researchers reported in the journal Proceedings of the National Academy of Sciences. This cyclical firing may be the cause of the persistent itching and pain that are symptoms of oral and genital herpes as well as shingles and chicken pox, according to the researchers.

These diseases are all caused by viruses of the herpes family. Understanding how these viruses cause discomfort could lead to better strategies for treating symptoms.

The team studied what happens when a herpes virus infects neurons. For research purposes the investigators used a member of the herpes family called pseudorabies virus. Previous research indicated that these viruses can drill tiny holes in neurons, which pass messages in the form of electrical signals along long conduits known as axons.

The researchers' findings indicate that electrical current can leak through these holes, or fusion pores, and spread to nearby neurons that were similarly damaged, causing the neurons to fire all at once rather than as needed. The pores were likely created for the purpose of infecting new cells, the researchers said.

The investigators observed the cyclical firing of neurons in a region called the submandibular ganglia between the salivary glands and the brain in mice using a technique called 2-photon microscopy and dyes that flash brightly when neurons fire.

The team found that two viral proteins appear to work together to cause the simultaneous firing, according to Andra Granstedt, who received her Ph.D. in molecular biology at Princeton in 2013 and is the first author on the article. The team was led by Lynn Enquist, Princeton's Henry L. Hillman Professor in Molecular Biol
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Contact: Catherine Zandonella
czandone@princeton.edu
Princeton University
Source:Eurekalert

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