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Study suggests nicotine addiction might be controlled by influencing brain mechanisms
Date:12/8/2007

Boca Raton, FL, December 8, 2007 There is a clear link between GABA a chemical substance of the central nervous system that inhibits neurons in the brain and nicotine dependence, according to a study presented today at the American College of Neuropsychopharmacology (ACNP) annual meeting. Researchers discovered that nicotine has significant effects on brain GABA, a finding which could potentially help curb the pleasurable effects of nicotine and help people break their addiction to it.

We found that GABA may provide a very useful target for nicotine addiction therapies, said Graeme Mason, Ph.D., associate professor in the Magnetic Resonance Research Center in the Departments of Diagnostic Radiology and Psychiatry at Yale University School of Medicine and an ACNP member. GABA is just one of a complex network of actors that promotes addiction, and were hoping that this research will ultimately lead us to ways to help people quit smoking.

Mason sought to discover whether the enjoyable effects associated with smoking could be reduced in some way. When people use nicotine they may experience a sensation of reward, diminished anxiety, or a belief that they can focus more clearly or learn more easily. Researchers wanted to explore how a specific type of neuron that releases dopamine, a chemical that has been associated with pleasure, can prolong and intensify the pleasurable effects of nicotine. Although GABA inhibits those neurons, nicotine works against the ability of GABA to inhibit dopamine neurons after about 20 minutes, so the gratifying effects of nicotine are prolonged.

Researchers gave people who smoked regularly nicotine inhalers that deliver the same amount of the drug as in one cigarette. The amount of GABA in the subjects brains rose about 10%, but the brain was found to make GABA four times faster after using the inhalers, and the rate of new GABA generation remained high for at least 45 minutes. In other words, keeping th
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Contact: Sharon Reis
sreis@gymr.com
202-745-5103
American College of Neuropsychopharmacology
Source:Eurekalert

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