PMID: 6602161Jul 1, 1983Paper

The biologic activity of mast cell granules. V. The effects of antihistamine treatment on rat cutaneous early- and late-phase allergic reactions

The Journal of Allergy and Clinical Immunology
R F LemanskeM Kaliner


Mast cell-dependent late-phase allergic reactions (LPR) as sequelae of immediate hypersensitivity responses (IR) occur in both human and rat skin; thus the rat has served as a useful model to investigate the pathogenesis of cutaneous LPR. To analyze the roles that histamine might play in the generation of rat LPR, the effects of H1 and/or H2 antihistamines on both LPR and antecedent blueing responses (IR) were investigated. Systemically administered diphenhydramine and cimetidine, alone or in combination, reduced blueing reactions to histamine. However, blueing responses to anti-IgE were only partially abrogated by antihistamine treatment with diphenhydramine alone or the combination of antihistamines. Diphenhydramine treatment alone partially inhibited the histologic intensity of LPR in a dose-dependent manner. Although cimetidine treatment alone had no inhibitory effect, it potentiated the diphenhydramine-induced inhibition of LPR. The inhibitory action of antihistamine treatment was apparent only in reactions elicited by anti-IgE or mast cell granules containing histamine, since LPR caused by histamine-free mast cell granules were not affected by antihistamines. This observation suggests that the inhibitory effect of antihis...Continue Reading


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