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It may be possible to switch off acute pain

New York: Researchers from Columbia University Medical Center have uncovered a protein in nerve cells that behaves like a switch for severe pain. They hope to manufacture drugs that are capable of blocking chronic pain, by simply switching off. //

Most prior attempts at alleviating chronic pain have focused on the "second order" neurons in the spinal cord that relay pain messages to the brain. It's difficult to inhibit the activity of these neurons with drugs, though, because the drugs need to overcome the blood-brain barrier. Instead, the CUMC researchers have focused on the more accessible "first order" neurons in the periphery of our body that send messages to the spinal cord.

Pain becomes chronic when the activity of first and second order neurons persists after damaged neuron heals or the tissue inflammation subsides. It's been known for years that for chronic pain to persist, a master switch must be turned on inside the peripheral neurons, though until now the identity of this switch remained a mystery. Richard Ambron, Ph.D., professor of cell biology, and Ying-Ju Sung, Ph.D., assistant professor, both in the department of Anatomy and Cell Biology, have now discovered that the switch is an enzyme called protein kinase G (PKG).

"We're very optimistic that this discovery and our continued research will ultimately lead to a novel approach to pain relief for the millions suffering from chronic pain," said Dr. Ambron.

The researchers found that upon injury or inflammation, the PKG is turned on and activated. Once activated, these molecules set off other processes that generate the pain messages. As long as the PKG remains on, the pain persists. Conversely, turning the PKG off relieves the pain, making PKG an excellent target for therapy.

Dr. Ambron and Dr. Sung have applied for a patent for the pathway that turns on the PKG, as well as several molecules that inhibit it.

Based on the 2004 Ame
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