Target intelligence / Profile preview

Histaminergic Receptor (HR)

Target
HR
Molecular classification
G protein-coupled receptor, GPCR, Receptor
01

Overview

Histaminergic receptors are a class of G protein–coupled receptors (GPCRs) that bind histamine as their primary endogenous ligand. There are four main subtypes: H1, H2, H3, and H4, each with distinct tissue distribution, signaling mechanisms, and physiological roles in processes such as allergic reactions, gastric acid secretion, neurotransmission, and immune modulation.

Other names
Histamine ReceptorHistamine Receptors
02

Mechanism of action

Agonist or antagonist binding to the receptor, modulating downstream signaling pathways (e.g., IP3/DAG, cAMP)

03

Biological functions

Signal transductionNeurotransmissionImmune responseGastric acid secretionRegulation of wakefulnessChemotaxisCytokine production
04

Disease associations

Allergic reactionsInflammationGastroesophageal Reflux Disease (GERD)Peptic ulcer diseaseNeurological disordersAsthma
05

Safety considerations

Drowsiness (first-generation antihistamines)Cardiac effects (some antihistamines)Drug interactionsPotential for CNS side effects
06

Interacting drugs

Antihistamines (H1 receptor antagonists)

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