Nagai H, Abe T, Yamaguchi I, Mito K, Tsunematsu M, Kimata M, Inagaki N. Role of mast cells in the onset of IgE-mediated late-phase cutaneous response in mice.
J Allergy Clin Immunol 2000;
106:S91-8. [PMID:
10887340 DOI:
10.1067/mai.2000.106778]
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Abstract
BACKGROUND
In mice that are passively sensitized to IgE, cutaneous antigen challenge produces a biphasic response with peaks at 1 and 24 hours after challenge.
OBJECTIVE
We investigated the role of mast cells in the IgE-mediated late-phase reaction in mice.
METHODS
We histologically and ultrastructurally investigated the morphologic changes of mast cells during the biphasic responses.
RESULTS
Degranulation of mast cells, which was observed between 4 and 24 hours after challenge, reached a peak at 8 hours. Piecemeal degranulation was seen during the immediate phase reaction. The number of IL-6-positive mast cells was increased after 4 hours in both IgE-sensitized and unsensitized mice, but positive cells showed a greater increase in sensitized mice and reached a peak after 8 hours. With in situ hybridization experiments, mast cells were positive for IL-6 messenger RNA at 6 hours after challenge.
CONCLUSION
These findings indicate that anaphylactic degranulation of mast cells and the expression of IL-6 mRNA within 4 hours after antigen challenge are important for the onset of the late-phase allergic cutaneous reaction in mice.
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