Role of mast cells in the onset of IgE-mediated late-phase cutaneous response in mice

https://doi.org/10.1067/mai.2000.106778Get rights and content

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. (J Allergy Clin Immunol 2000;106:S91-8.)

Section snippets

Mice

Female specific-pathogen–free BALB/c Cr Slic mice were obtained from Japan SLC (Shizuoka, Japan) and used at 8 to 10 weeks of age. They were housed in plastic cages in an air-conditioned room at 24°C, fed a standard laboratory diet, and given water as desired. All experiments were performed according to a guideline for the care and use of experimental animals made by the Japanese Association for Laboratory Animal Science in 1987.

Antibodies and other reagents

Monoclonal anti-dinitrophenol IgE was prepared from EC-1 cells.6 A

Ear thickness

The changes of ear thickness in passively sensitized mice showed 2 peaks after DNFB challenge (Fig l, A ) (Fig 1, B ).figureThe first peak was at 1 hour, and the second was at 24 hours after the challenge, which represented the IPR and LPR, respectively.

Histologic findings

At 30 minutes to 1 hour after the DNFB challenge, slight dermal edema and vasodilatation were observed in the ears (Fig 2, A and B ).figureAt 4 and 8 hours, mild inflammatory cell infiltration (mainly neutrophils and a few macrophages) and focal

DISCUSSION

This study showed that AND and the expression of IL-6 mRNA and protein by mast cells within 4 hours after antigen challenge were important steps preceding the allergic cutaneous LPR in mice.

Allergic individuals, who are exposed to an appropriate antigen challenge, experience an IPR followed several hours later by the LPR. In recent years, investigators have focused on the LPR, because it is felt that this inflammatory response, which not only involves mediators but also mobilization of various

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