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Pain relief with PAP injections may last 100 times longer than a traditional acupuncture treatment
Date:4/23/2012

CHAPEL HILL, N.C. Scientists at the University of North Carolina at Chapel Hill have identified a new way to deliver long-lasting pain relief through an ancient medical practice.

In an article published in the April 23 online edition of Molecular Pain, UNC researchers describe how exploiting the molecular mechanism behind acupuncture resulted in six-day pain relief in animal models. They call this new therapeutic approach PAPupuncture.

Principal investigator Mark J. Zylka, PhD, associate professor in the Department of Cell and Molecular Physiology and the UNC Neuroscience Center, said this is a promising study that moves his lab's work with prostatic acid phosphatase, known as PAP, towards translational research.

Several years ago, Zylka and members of his lab documented how injecting PAP into the spine eased chronic pain for up to three days in rodents. The only problem was PAP's delivery.

"Spinal injections are invasive and must be performed in a clinical setting, and hence are typically reserved for patients with excruciating pain," said Zylka. Though he had never received acupuncture or researched traditional Chinese medicine, Zylka said recent research showing how acupuncture relieved pain caught his eye.

"When an acupuncture needle is inserted into an acupuncture point and stimulated, nucleotides are released. These nucleotides are then converted into adenosine," said Zylka. Adenosine has antinociceptive properties, meaning adenosine can decrease the body's sensitivity to pain. The release of adenosine offers pain relief, but for most acupuncture patients that relief typically lasts for a few hours.

"We knew that PAP makes adenosine and lasts for days following spinal injection, so we wondered what would happen if we injected PAP into an acupuncture point?" Zylka said. "Can we mimic the pain relief that occurs with acupuncture, but have it last longer?"

To find out, Zylka a
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Contact: Les Lang
llang@med.unc.edu
919-966-9366
University of North Carolina School of Medicine
Source:Eurekalert  

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