It is intriguing that during human cultural evolution man has detected plant natural products that appear to target key protein receptors of important physiological systems rather selectively. Plants containing such secondary metabolites usually belong to unique chemotaxa, induce potent pharmacological effects and have typically been used for recreational and medicinal purposes or as poisons. Cannabis sativa L. has a long history as a medicinal plant and was fundamental in the discovery of the endocannabinoid system. The major psychoactive Cannabis constituent D9 -tetrahydrocannabinol (D9 -THC) potently activates the G-protein-coupled cannabinoid receptor CB1 and also modulates the cannabinoid receptor CB2. In the last few years, several...
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