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Cannabinoid receptors found primarily in the brain and central nervous system that THC binds to produce psychoactive effects.
CB1 receptors are a type of cannabinoid receptor found primarily in the brain and central nervous system. They are among the most abundant G-protein-coupled receptors in the human brain, concentrated in areas responsible for memory, mood, motor control, and pain perception, including the hippocampus, basal ganglia, and cerebellum.
When THC enters the body, it binds to CB1 receptors in the brain, triggering the cascade of effects associated with being high: euphoria, altered time perception, increased appetite, and short-term memory changes. The body's own endocannabinoid, anandamide, naturally activates these same receptors but with a milder and shorter-lasting effect. CB1 receptors use retrograde signaling, meaning they send messages backward across synapses to regulate the release of other neurotransmitters like glutamate, GABA, and dopamine.
The density and sensitivity of CB1 receptors help explain individual differences in cannabis response. People with naturally fewer CB1 receptors may be less sensitive to THC, while those with more may feel its effects more strongly. Chronic THC use causes CB1 receptor downregulation, which is the biological basis of tolerance. Understanding CB1 receptors has also driven pharmaceutical research, though synthetic CB1 agonists have had mixed results due to the complexity of the endocannabinoid system.
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