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Target intelligence / Profile preview
Histamine Receptor H3 (H3R)
- Target
- H3R
- Molecular classification
- G protein-coupled receptor, Receptor, Class A GPCR
01
Overview
The histamine H3 receptor is a predominantly brain-expressed GPCR that acts both as an autoreceptor regulating its own transmitter's synthesis/release and a heteroreceptor modulating many key CNS transmitters. Its pharmacological targeting has yielded clinical therapies for sleep disorders like narcolepsy while ongoing research explores broader neuropsychiatric applications due to its central role modulating arousal states and cognition.
- Other names
- GPCR97H3RHH3R
02
Mechanism of action
Primarily coupled to Gi/o proteins: Inhibits adenylate cyclase activity, reduces cAMP formation, interacts with N-type voltage-gated calcium channels to reduce calcium influx and decrease neurotransmitter release. Can activate phospholipase A2 for arachidonic acid release; may also signal through PI3K/Akt/GSK pathways. Functions as both an autoreceptor and heteroreceptor to modulate neurotransmitter release. Displays constitutive activity.
03
Biological functions
Signal transductionNeurotransmitter release regulationAutoreceptor functionHeteroreceptor functionModulation of neurotransmitter synthesisRegulation of sleep-wake cycleFood intake regulationCognitive function modulation
04
Disease associations
NarcolepsyAlzheimer's diseaseAttention deficit hyperactivity disorder (ADHD)Parkinson's disease (potential)Tourette syndrome (potential)Epilepsy (potential)Schizophrenia (potential)Drug abuse (potential)
05
Safety considerations
Potential for off-target effects due to modulation of multiple neurotransmitter systemsCardiovascular effectsPsychiatric side effects
06
Interacting drugs
Histamine
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