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The new study describes a pathway-different than the one previously suggested-for the biosynthesis of neurotransmitter lipids, N-acyl ethanolamines (NAEs), which include the endogenous cannabinoid ("endocannabinoid") anandamide. The high activity of the enzyme a/b hydrolase4 (Abh4) in areas such as the central nervous system suggests that the pathway makes a "potentially major contribution" to endocannabinoid signaling.

Endocannabinoids are naturally produced substances similar to the active ingredient D9-tetrahydrocannabinol (THC) in marijuana. Cannabinoid receptors were first discovered in 1988; the first endocannabinoid, anandamide, which shares some of the pharmacologic properties of THC, was identified in 1992.

Other research has shown that the endogenous cannabinoid system helps control food intake, among other critical processes, by acting on cannabinoid receptors in the central nervous system. The system drives consumption of fat and calorie-rich foods and the amount of fat stored or expended and plays a significant role in energy homeostasis.

"At least one cannabinoid receptor antagonist is on the verge of approval for the treatment of obesity-metabolic disorders," said Cravatt. "Enzymes involved in endocannabinoid biosynthesis, such as the one highlighted in our study, can be viewed as complementary drug targets. One potential advantage of this approach is that it may prove more selective than a receptor antagonist. By inhibiting enzymes such as Abh4, we may be able to disrupt the activity of a single class of endocannabinoids, rather than all of them."

In the new study, the researchers provide biochemical evidence of an alternative pathway for NAE biosynthesis in vivo and demonstrate that these new routes are especially important for the creation o
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Source:American Chemical Society