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GABA deficits disturb endocannabinoid system
Date:1/24/2012

Philadelphia, PA, January 24, 2012 Changes in the endocannabinoid system may have important implications for psychiatric and addiction disorders. This brain system is responsible for making substances that have effects on brain function which resemble those of cannabis products, e.g., marijuana.

The endocannabinoid system is of particular interest in the field of schizophrenia research because exposure to cannabis products during adolescence and young adulthood appears to increase the risk for developing schizophrenia. Also, in studies examining brain tissue collected from people who had schizophrenia, changes in the endocannabinoid system were highly correlated with changes in the principal inhibitory chemical messenger system in the brain, the gamma-aminobutyric acid (GABA) system.

The current study was conducted in order to research the relationship between changes in the GABA system and changes in the endocannabinoid system. Led by Dr. David Lewis at the University of Pittsburgh, researchers made genetic manipulations in mice that selectively reduced the GABA system function by decreasing the expression of the enzyme that makes GABA, GAD67, or by decreasing the expression of the principal receptor target for endocannabinoids in the brain, the cannabinoid 1 receptor (CB1R), in order to determine whether a change in one is sufficient to cause a change in the other.

Using these techniques, the researchers demonstrated that reduced expression of GAD67 can lead to reduced expression of CB1R, but not vice versa.

"Because activation of the CB1R suppresses GABA release, lower levels of CB1R may help augment GABA release from nerve terminals that have below normal amounts due to reduced GABA synthesis," said Dr. Lewis of the results. "This evidence suggests that reduced GABA signaling is an 'upstream' event in the disease process of schizophrenia and that lower CB1R is a compensation to help normalize GABA signaling."


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Contact: Rhiannon Bugno
biol.psych@utsouthwestern.edu
214-648-0880
Elsevier
Source:Eurekalert

Page: 1 2

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