The cannabinoid receptor type 1, often abbreviated as CB1, is a G protein-coupled receptor that is predominantly found in the brain and central nervous system, although it is also present in some peripheral tissues and organs. It is one of the two primary cannabinoid receptors, with the other being CB2, and is activated by the endogenous neurotransmitters known as endocannabinoids, which include anandamide and 2-arachidonoylglycerol, as well as by plant-derived cannabinoids such as THC, the psychoactive component of cannabis. The activation of the CB1 receptor plays a significant role in the modulation of neurotransmitter release, and it can influence various physiological and cognitive processes including pain sensation, appetite, mood, and memory. The receptor’s distribution within the brain is associated with its involvement in these diverse functions. CB1 receptors are also implicated in the psychoactive effects of cannabis and are considered a target for the treatment of multiple conditions, including chronic pain, anxiety, and epilepsy. Research into CB1 receptors continues to expand our understanding of the endocannabinoid system and its potential therapeutic applications.

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