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Direct effects of second-generation H1-receptor antagonists on the activation of human basophils. 1994

U Ramachers, and U Amon, and H H Wolff
Department of Dermatology, Medical University of Lübeck, Germany.

The present study was performed to investigate the putative suppressive effects of H1-receptor antagonists (HRA) of the second generation (astemizole (AS), cetirizine (CT), loratadine (LO), oxatomide (OX) and terfenadine (TF)) on the mediator release from human basophils activated by two classical stimuli. Anti-IgE-mediated histamine release was inhibited in a dose-dependent fashion by TF (maximum inhibitory value: 33.8 +/- 7.6%, 100 microM, n = 7), whereas the other HRA exhibited weaker activity. The anti-IgE-induced LTC4 production was strongly suppressed by TF, LO and OX (92.4 +/- 6.3%, 90.8 +/- 6.0% and 88.5 +/- 5.6%, 100 microM, n = 4-5), while AS was less active (56.4 +/- 4.1%, 100 microM, n = 5). Histamine release induced by incubation with grass pollen antigen (0.01%) was inhibited by TF (40.7 +/- 4.1%, 50 microM, n = 4), but the other HRA showed only low activity. The present findings suggest that some HRA might exhibit direct inhibitory effects on activation of IgE-receptor bearing cells.

UI MeSH Term Description Entries
D007073 Immunoglobulin E An immunoglobulin associated with MAST CELLS. Overexpression has been associated with allergic hypersensitivity (HYPERSENSITIVITY, IMMEDIATE). IgE
D006634 Histamine H1 Antagonists Drugs that selectively bind to but do not activate histamine H1 receptors, thereby blocking the actions of endogenous histamine. Included here are the classical antihistaminics that antagonize or prevent the action of histamine mainly in immediate hypersensitivity. They act in the bronchi, capillaries, and some other smooth muscles, and are used to prevent or allay motion sickness, seasonal rhinitis, and allergic dermatitis and to induce somnolence. The effects of blocking central nervous system H1 receptors are not as well understood. Antihistamines, Classical,Antihistaminics, Classical,Antihistaminics, H1,Histamine H1 Antagonist,Histamine H1 Receptor Antagonist,Histamine H1 Receptor Antagonists,Histamine H1 Receptor Blockaders,Antagonists, Histamine H1,Antagonists, Histamine H1 Receptor,Antihistamines, Sedating,Blockaders, Histamine H1 Receptor,First Generation H1 Antagonists,H1 Receptor Blockaders,Histamine H1 Blockers,Receptor Blockaders, H1,Antagonist, Histamine H1,Classical Antihistamines,Classical Antihistaminics,H1 Antagonist, Histamine,H1 Antagonists, Histamine,H1 Antihistaminics,Sedating Antihistamines
D006636 Histamine Release The secretion of histamine from mast cell and basophil granules by exocytosis. This can be initiated by a number of factors, all of which involve binding of IgE, cross-linked by antigen, to the mast cell or basophil's Fc receptors. Once released, histamine binds to a number of different target cell receptors and exerts a wide variety of effects. Histamine Liberation,Histamine Liberations,Histamine Releases
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D001491 Basophils Granular leukocytes characterized by a relatively pale-staining, lobate nucleus and cytoplasm containing coarse dark-staining granules of variable size and stainable by basic dyes. Basophil
D017997 Leukotriene C4 The conjugation product of LEUKOTRIENE A4 and glutathione. It is the major arachidonic acid metabolite in macrophages and human mast cells as well as in antigen-sensitized lung tissue. It stimulates mucus secretion in the lung, and produces contractions of nonvascular and some VASCULAR SMOOTH MUSCLE. (From Dictionary of Prostaglandins and Related Compounds, 1990) LTC4,Leukotriene C,Leukotriene C-1,Leukotriene C-4,Leukotriene C1,Leukotrienes C,Leukotriene C 1,Leukotriene C 4
D066298 In Vitro Techniques Methods to study reactions or processes taking place in an artificial environment outside the living organism. In Vitro Test,In Vitro Testing,In Vitro Tests,In Vitro as Topic,In Vitro,In Vitro Technique,In Vitro Testings,Technique, In Vitro,Techniques, In Vitro,Test, In Vitro,Testing, In Vitro,Testings, In Vitro,Tests, In Vitro,Vitro Testing, In

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