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J Allergy Clin Immunol. 2008 Mar;121(3):718-24. Epub 2007 Dec 21.

Contribution of allergen-specific and nonspecific nasal responses to early-phase and late-phase nasal responses.

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  • 1Division of Cell Biology, Department of Pediatrics, National Jewish Medical and Research Center, Denver, CO 80206, USA.

Abstract

BACKGROUND:

The relative contributions of the allergen-specific early-phase nasal response and nonspecific nasal response and mast cells to the pathophysiology of allergic rhinitis are not well defined.

OBJECTIVES:

To determine the contributions of specific reactivity, nonspecific reactivity, and mast cells to the development of early-phase and late-phase responses using a mouse model of allergic rhinitis.

METHODS:

Sensitized wild-type and FcvarepsilonRI-deficient (FcvarepsilonRI-/-) mice were exposed to allergen for 3, 5, or 12 days. As indicators of nasal reactivity, respiratory frequency and nasal resistance were monitored.

RESULTS:

Sensitized mice exposed to 3 days of nasal allergen challenge showed a nonspecific early-phase response. As the number of allergen exposures increased, there was progressive diminution in nonspecific responses with increased allergen-specific early-phase responses and a late-phase response. Sensitized FcvarepsilonRI-/- mice did not develop nonspecific nasal responses or late-phase responses, but transfer of in vitro-differentiated wild-type mast cells into FcvarepsilonRI-/- mice restored nonspecific early-phase nasal responses but not the late-phase response.

CONCLUSION:

These data identify the nonspecific nasal response as a major contributor to the early-phase response, especially during initial allergen exposure, and is dependent on mast cells. Increasing allergen exposure results in increasing allergen-specific responses, converting the nonspecific early-phase response to a late-phase response that is allergen-specific and mast cell-independent.

PMID:
18155286
[PubMed - indexed for MEDLINE]
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