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Indiana University neuroscientists map a new target to wipe pain away
Date:6/5/2011

INDIANAPOLIS Researchers at the Indiana University School of Medicine have discovered a peptide that short circuits a pathway for chronic pain. Unlike current treatments this peptide does not exhibit deleterious side effects such as reduced motor coordination, memory loss, or depression, according to an article in Nature Medicine posted online June 5, 2011.

The peptide, CBD3, has been shown in mice to interfere with signals that navigate calcium channels to produce pain. Unlike other substances that block pain signals, CBD3 does not directly inhibit the influx of calcium. This is important as influx of calcium regulates heart rhythm and vital functions in other organs.

Rajesh Khanna, Ph.D., assistant professor of pharmacology and toxicology at the Indiana University School of Medicine, said the peptide discovered by him and his colleagues is potentially safer to use than addictive opioids or cone snail toxin Prialta recognized analgesic that is injected into the spinal column, both of which can cause respiratory distress, cardiac irregularities and other problems.

"After opioidsthe gold standard for pain control -- the next target is calcium channels," said Dr. Khanna. "Along the pain pathway in the spinal cord, there are pain-sensing neurons called nociceptors that have an abundance of calcium channels."

Earlier international research has shown that the calcium channel is a key player within the pathway for pain signals. Based on work from Dr. Khanna's laboratory, it is also accepted that an axonal protein, CRMP-2, binds to the calcium channel "acting like a remote control" to modulate transmission of excitability and pain signals, Dr. Khanna explained.

He and his colleagues discovered the CBD3 peptide, a portion of the CRMP-2 protein, realizing that its smaller size would be beneficial in producing a synthetic version for drug development.

CBD3 can be given systemically and blocks pain in a
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Contact: Mary L. Hardin
mhardin@iupui.edu
317-274-7722
Indiana University School of Medicine
Source:Eurekalert  

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