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Scripps Research study overturns decade-old findings in neurobiology
Date:5/12/2010

LA JOLLA, CA May 12, 2010 In findings that should finally put to rest a decade of controversy in the field of neurobiology, a team at The Scripps Research Institute has found decisive evidence that a specific neurotransmitter systemthe endocannabinoid systemis active in a brain region known to play a key role in the processing of memory, emotional reactions, and addiction formation. The new study also shows that this system can dampen the effects of alcohol, suggesting an avenue for the development of drugs to combat alcohol addiction.

The research was published in the journal Neuropsychopharmacology on May 12.

"This study will change a lot in the field," said Scripps Research Associate Professor Marisa Roberto, who was first author of the paper. "I'm confident it will have a big impact."

"This is very new," said Paul Schweitzer, associate professor of the neurobiology of addiction at Scripps Research and corresponding author of the paper. "It is the first time a study has shown a direct cellular interaction between endocannabinoids and alcohol in the brain."

The Missing Link?

The new research overturns the conclusions of a paper published by a European group in the Journal of Neuroscience in 2001. This paper claimed that endocannabinoid receptors, in particular the most common type called CB1, did not exist in the brain region called the central amygdala.

"Yet CB1 receptors are very abundant," said Schweitzer. "They are almost everywhere in the brain and there are lots of them. The endocannabinoid system acts on appetite, mood, memoryand addiction. Addiction is why we started to study it in the central amygdala."

The Scripps Research scientists began to suspect that the 2001 study, whose conclusions had been widely accepted in the field, might have missed the CB1 receptors in the brain's central amygdala. Indirect evidence from a number of subsequent studiesincluding one by Scripp
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Contact: Keith McKeown
kmckeown@scripps.edu
858-784-8134
Scripps Research Institute
Source:Eurekalert

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