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Histamine receptor antagonists and related ligands target H1 to H4, the four G protein-coupled receptors for histamine. H1 receptors mediate allergic and smooth muscle responses, whereas H2 receptors control gastric acid secretion. Black and colleagues defined the H2 receptor in 1972 as a histamine receptor that classic H1 antagonists failed to block. The H3 receptor acts mainly as a presynaptic autoreceptor in the brain, and its human gene was cloned in 1999. H4, the most recently described subtype, is expressed largely on immune cells. Ligands here include the H1 antagonist chlorpheniramine maleate and the H2 antagonist cimetidine. Ciproxifan blocks H3, while JNJ7777120 is a widely used H4 antagonist.
Synonyms: R89674
Alcaftadine is a high affinity ligand for the H1 receptor, with a pKi (8.5) that is comparable with that of other H1 antihistamines. Alcaftadine is also an antagonist for H2 and H4 receptors with no affinity for the H3 receptor.
Bodilisant is a fluorescent ligand for the histamine H3 receptor (hH3R). It demonstrates high affinity, allowing detection of hH3R activity in cells overexpressing the receptor at low concentrations (1-10 nM) and in hH3R-rich tissues at approximately 1 μM. This compound serves as a valuable pharmacological tool for receptor imaging and offers insights into histamine receptor signaling pathways in research applications.
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H1R ligand-1 is a high-affinity ligand for the human histamine H1 receptor (H1R), serving as a crucial tool in the study of histamine signaling pathways. This compound can be utilized as a scaffold for the design and synthesis of various derivatives, facilitating the exploration of H1R binding kinetics and the development of novel therapeutic agents targeting this receptor. It is valuable for research applications focused on allergic reactions, central nervous system disorders, and other conditions influenced by histamine activity.
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Platelet aggregation-IN-3 is a ligand for H2 histamine receptors, α2-adrenergic receptors (α2-AR), and 5-HT2(B,C) serotonin receptors. This compound effectively inhibits platelet aggregation induced by ADP and collagen and modulates tumor cell-induced platelet aggregation (TCIPA). Platelet aggregation-IN-3 shows potential for applications in antiplatelet therapy for cardiovascular diseases and in the prevention of cancer-related thrombosis and tumor metastasis.
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Pirdonium bromide is a hydrophilic ligand for the H1 receptor, characterized by its quaternary ammonium structure. This compound displays significant activity in modulating histamine receptor signaling pathways and is utilized in research applications related to allergic responses and neurotransmission. Its ability to interact selectively with H1 receptors makes it a valuable tool for elucidating the physiological roles of histamine in various biological systems.
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VUF-6884 is a ligand for the histamine receptors H4R and H1R. It exhibits strong binding affinity with pEC50 values of 7.70 and 8.17 for H4R and H1R, respectively, and corresponding pKi values of 7.55 and 8.11. VUF-6884 competitively binds to the orthosteric site of the H4R, effectively displacing histamine, while demonstrating inverse agonist properties at the H1R. This compound is suitable for research applications related to histamine signaling and receptor pharmacology.
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VUF 10214 is a selective H4 receptor ligand with a pKi value of 8.25. This compound demonstrates notable anti-inflammatory activity in a carrageenan-induced paw edema model in rats, making it a valuable tool for research on inflammatory diseases. Its mechanism of action and high affinity for the H4 receptor position it as an important reagent in studying the role of this receptor in various inflammatory processes.
