Adenosine receptor (central nervous system subtype)

The label "Caffeine-mediated central nervous system stimulation" is not the name of a single molecule or receptor, but rather describes the effect of caffeine on the central nervous system primarily through antagonism of adenosine receptors, especially the A1 and A2A subtypes. Adenosine receptors are G protein-coupled receptors that mediate inhibitory neurotransmission in the brain, regulating arousal, sleep, cognitive function, and mood. By acting as a non-selective antagonist at these receptors, caffeine increases neuronal activity, counteracts fatigue, and promotes wakefulness and alertness. Caffeine indirectly enhances the release of neurotransmitters such as dopamine and norepinephrine, contributing to its psychostimulant effects. While caffeine’s other mechanisms—phosphodiesterase inhibition, calcium mobilization—can occur, these require higher, often toxic, concentrations and are not considered primary under physiological conditions[1][2][3][5][6][7]. Note: This query is problematic because "Caffeine-mediated central nervous system stimulation" is not a canonical target but a pharmacological effect mediated primarily, though not exclusively, by the CNS adenosine receptors (notably A1 and A2A)[3][5][6]. The canonical molecular targets for caffeine are adenosine receptor subtypes, principally in the brain.

Other names

Caffeine targetCNS adenosine receptorCaffeine receptor (informal; not standard)Caffeine pharmacological target

Competitive antagonism of adenosine receptors (mainly A1 and A2A subtypes), promotion of neurotransmitter release (dopamine, norepinephrine, acetylcholine, etc.) by disinhibition, and modulation of wakefulness and alertness via antagonism of CNS adenosine signaling.