Today's post from sciencedaily.com (see link below) looks at the studies being made at atomic and molecular level to find ways of treating neuropathic pain more directly and accurately. One of the more extreme and excruciatingly painful, neurological conditions is erythromelagia ('Man on Fire syndrome'). Scientists have found a mutation at molecular level in the sodium channels of patients and seen that because it responds well to carbamazepine for instance, identifying that mutation may lead to better targeted drug treatment in the future. Talking about sodium channels, genetic analysis and specific amino acids will leave most people cold but the important thing is that scientists are now looking much more closely at specific pain reactions to specific drugs. This can only lead to better treatment for neuropathy sufferers in the future as we know that it's not a 'one size fits all' disease. At the moment, drugs meant for other problems are thrown at neuropathy in the hope that one eventually works. Hopefully in the future. much of the guesswork will be removed.
ScienceDaily (Nov. 13, 2012)
An investigation into the molecular causes of a debilitating condition known as "Man on Fire Syndrome" has led Yale researchers to develop a strategy that may lead to personalized pain therapy and predict which chronic pain patients will respond to treatment.
More than a quarter of Americans suffer from chronic pain and nearly 40 percent do not get effective relief from existing drugs. In many common conditions such as diabetic neuropathy, no clear source of pain is found.
The new study published in the Nov. 13 issue of Nature Communications used sophisticated atomic modeling techniques to search for mutations found in a rare, agonizing, and previously untreatable form of chronic pain called erythromelagia, commonly referred to as "Man on Fire Syndrome." Researchers discovered that one of those mutations seem to predicted whether a patient would respond positively to drug treatment.
"Hopefully we can use this knowledge to help chronic pain patients in more systematic ways, and not depend upon trial and error," said Yang Yang, postdoctoral research associate in the Department of Neurology and lead author of the paper.
Under the leadership of Stephen Waxman, the Bridget Marie Flaherty Professor of Neurology, professor of neurobiology and of pharmacology, and senior author of the new paper, Yale has been a leader in identifying the sodium channel Nav1.7 at the base nerve cells as the regulator of several forms of chronic pain. The members of the Waxman lab were intrigued when it was reported the anti-seizure medicine carbamazepine relieved pain in members of a family suffering from erythromelagia, apparently by working on the Nav 1.7 sodium channel.
Yale researchers conducted an exhaustive genetic analysis and discovered that a specific variant -- a difference of a single amino acid among 1,800 -- in the sodium channel explained why this family responded to the drug. In this new paper, the Yale team developed a three-dimensional structural model of human Nav1.7 channel and systemically looked at different erythromelagia mutations at the atomic level. The Yale team found an additional, second mutation that was sensitive to carbamazepine treatment. In theory, chronic pain patients with this mutation should respond to treatment with carbamazepine.
"This work shows us that the goal of personalized, genomically-guided drug treatment for pain is not unrealistic," Waxman said.
The U.S. Department of Veterans Affairs funded the work.
Other Yale authors include Sulayman D. Dib-Hajj, Lynda Tyrrell, and Mark Estacion.
http://www.sciencedaily.com/releases/2012/11/121113122040.htm
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