Abstract
Brown Norway allergy model rats sensitized to toluene 2,4-diisocyanate (TDI) were developed. Histamine H1receptor mRNA level was elevated in nasal mucosa of allergy model rats after the provocation with TDI, which was followed by H1-receptor up-regulation. Elevation of histamine H1receptor mRNA was partially suppressed by d-chlorpheniramine and olopatadine, antihistamines. Histamine induced increase in histamine H1receptor gene expression in vitro, and the protein kinase C-δ isoform was suggested to mediate the gene expression. On the other hand, elevation of histamine H1receptor mRNA was completely suppressed by dexamethasone in allergy model rats. Provocation with TDI also induced mRNA elevation of histidine decarboxylase, a sole histamine-forming enzyme, followed by the increase of both HDC activity and histamine content in nasal mucosa of allergy model rats. HDC mRNA elevation and increase in both HDC activity and histamine level were almost completely suppressed by dexamethasone. These observations suggest that histamine H1receptor up-regulation and increase in histamine level play an important role in allergy through the regulation of histamine signaling.
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