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Why don't painkillers work for people with fibromyalgia?
Date:9/27/2007

hat, with the lower availability of the MORs in three regions of the brains of people with fibromyalgia, such painkillers may not be able to bind as well to the receptors as they can in the brains of people without the condition.

Put more simply: When the painkillers cannot bind to the receptors, they cannot alleviate the patients pain as effectively, Harris says. The reduced availability of the receptors could result from a reduced number of opioid receptors, enhanced release of endogenous opioids (opioids, such as endorphins, that are produced naturally by the body), or both, Harris says.

The research team also found a possible link with depression. The PET scans showed that the fibromyalgia patients with more depressive symptoms had reductions of MOR binding potential in the amygdala, a region of the brain thought to modulate mood and the emotional dimension of pain.

The study subjects were 17 women with fibromyalgia and 17 women without the condition.


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Contact: Katie Vloet
kgazella@umich.edu
734-764-2220
University of Michigan Health System
Source:Eurekalert

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