Histamine, one of the most important mediators of allergy and inflammation, is a chemical messenger and aminergic neurotransmitters.
It plays an important role in a multitude of physiological processes in central and peripheral tissues.
Histamine is synthesized in a restricted population of neurons located in the tuberomammillary nucleus of the posterior hypothalamus implicated in many brain functions (e.g.
In peripheral tissues histamine is stored in mast cells, basophils, enterochromaffin cells.
Histamine release leads to various well-known symptoms of allergic conditions in the skin and the airway system.
Histamine effects are mediated by four pharmacologically distinct receptors, the H1R, H2R , H3R and H4R receptors, which are all members of the G-protein coupled receptor (GPCR) family.
Histamine receptors display 7 TM domains, an extracellular N-terminus, and a cytoplasmic C-terminus of variable length.
Human Histamine 3 receptor, H3R (GPCR97), has recently been identified as a presynaptic autoreceptor on histamine neurons in the brain controlling the stimulated release of histamine.
Subsequently, the H3 receptor has been shown to be a presynaptic heteroreceptor in nonhistamine-containing neurons in both the central and peripheral nervous systems.
H3R (rat/human 445 aa, ~93% homology) is primarily expressed in the brain.
Several studies using H3 selective agonists revealed that H3R couples to pertussis toxin-sensitive Gi/o protein
Applications:Suitable for use in ELISA.
Western Blot, though not tested, may potentially be used as an application.
