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A New Approach to Manage Opiate Addiction

Withdrawal symptoms like severe pain, nausea, agitation and sweats motivate addicts to continue taking drugs. The findings// of a new study suggest new approaches to reduce withdrawal symptoms.

A new study finds that disrupting the brain's stress-response mechanism exacerbates behavioral withdrawal symptoms in mice, and that giving the mice the hormone corticosterone alleviates those symptoms.

Angelo Contarino of Université Victor Segalen Bordeaux 2 and colleagues published their findings in the February 15, 2007 issue of the journal Neuron, published by Cell Press.

In their studies, the researchers mimicked the pattern of opiate addiction and withdrawal in mice that were genetically deficient in a receptor called CRF1. Receptors are proteins on the cell surface that trigger reactions in the cell when activated.

CRF1 is a trigger for the corticotrophin-releasing factor system in the brain and is an essential protein for coping with stressful events. In mimicking addiction and withdrawal, the researchers gave the mice increasing doses of morphine and then stopped morphine administration to induce withdrawal symptoms.

The researchers found that the CRF1-deficient mice showed more severe and prolonged behavioral symptoms of withdrawal—such as jumping and "wet dog shaking"—when compared with normal mice as had been shown previously. Similarly, when the researchers administered a drug that blocks the receptor in normal mice, they saw the same aggravating effects.

The researchers also detected genetic changes in the brains of the mice, which indicated that the stress-response circuitry in the brain was impaired.

However, Contarino and colleagues found that giving the mice the steroid hormone corticosterone abolished the difference in withdrawal symptoms between the CRF1-deficient and normal mice. The hormone also restored the normal stress-response-related genetic activity in the brain, they found.

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