Histamine Receptor 1 (H1R)

Histamine, one of the most important mediators of allergy and inflammation, is a chemical messenger and aminergic neurotransmitter. 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. 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. H1R is distributed in the brain, most smooth muscle cells, endothelial cells, adrenal medulla, and heart. H1R plays roles in smooth muscle contraction, stimulation of nitric oxide formation, endothelial cell contraction, and increasing vascular permeability, all of which have close relationships with allergic conditions. H1R preferentially couples to the Gq/11 family of G-proteins and causes mobilization of intracellular Ca 2+ in a pertussis toxin-insensitive fashion. Compounds such as mepyramine \n(pyrilamine) and triprolidine are highly potent H1 antagonists, and easily penetrate the brain causing sedation. Many new non-sedating H1 antagonists.\n\nApplications: \nSuitable for use in ELISA and Western Blot. Other applications not tested.\n\nRecommended Dilution:\nWestern Blot: 1-10ug/ml using ECL.\nELISA: 1:10,000-1:100,000.\nOptimal dilutions to be determined by the researcher.\n\nStorage and Stability:\nMay be stored at 4 degrees C for short-term only. Aliquot to avoid repeated freezing and thawing. Store at -20 degrees C. Aliquots are stable for 12 months. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap.

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SPECIFICATIONS

Catalog Number

H5090-01D

Size

50ug

Applications

ELISA, WB

Hosts

Rabbit

Reactivities

Mouse, Rat, Bov

Form

Supplied as liquid in PBS, pH 7.4, 0.1% BSA.

P Type

Pab

Purity

Purified by immunoaffinity chromatography.

Isotype

IgG

References

1. Fujimoto, K., et al., 1996, BBRC, 190, 294. 2. Inoue, I., et al., 1996, PNAS 93, 13316. 3. DeBacker, M.D., et al., 1993, BBRC, 197, 1601. 4. Fukui, H., et al., 1994, BBRC 201, 894. 5.

Additional Info

Recognizes rat H1R. No significant sequence homology exists with other histamine receptors. Species Crossreactivity: mouse and bovine.