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Blocking marijuana-like chemical in brain may help stay slim

Washington, Wed, 07 Mar 2012 ANI

Washington, March 7 (ANI): Researchers have found that blocking a natural, marijuana-like chemical in the brain helped mice stay thin, even when they were fed a high-fat diet.


To create this hypermetabolic state, UC Irvine pharmacology professor Daniele Piomelli and colleagues engineered neurons in the forebrains of mice to limit production of an endocannabinoid compound called 2-AG.


All mammalian brains contain 2-AG, which the researchers believe helps control the activity of forebrain neural circuits involved in energy dissipation.


As a result, these modified mice ate more and moved less than typical mice but did not gain any weight, even when they were fed a high-fat diet. Additionally, they did not develop any signs of metabolic syndrome, a combination of health problems such as obesity and high blood pressure that increases the risk of cardiovascular disease and diabetes.


"We discovered that these mice were resistant to obesity because they burned fat calories much more efficiently than normal mice do," said Piomelli, the Louise Turner Arnold Chair in the Neurosciences.


"We had known that endocannabinoids play a critical role in cell energy regulation, but this is the first time we found a target where this occurs," he stated.


Specifically, these mutant mice stayed thin because their brown fat - a type of fat that exists in all mammals to keep them warm - became hyperactive and was converted into heat at a much more rapid pace than in ordinary mice.


Does this mean that a drug limiting 2-AG levels may one day become a weight-loss panacea? That's more easily said than done, according to Piomelli.


For the study, the mice were bred with brain cells manipulated to limit 2-AG production - which can't be done with humans.


"To produce the desired effects, we would need to create a drug that blocks 2-AG production in the brain, something we're not yet able to do," he explained.


"So don't cancel that gym membership just yet. But as you hit the treadmill, think about the added health benefits if you could train your brain to make fewer endocannabinoids," he noted.


The findings appeared in the March issue of Cell Metabolism. (ANI)


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