TITLE

The H1 histamine receptor regulates allergic lung responses

AUTHOR(S)
Bryce, Paul J.; Mathias, Clinton B.; Harrison, Krista L.; Watanabe, Takeshi; Geha, Raif S.; Oettgen, Hans C.
PUB. DATE
June 2006
SOURCE
Journal of Clinical Investigation;Jun2006, Vol. 116 Issue 6, p1624
SOURCE TYPE
Academic Journal
DOC. TYPE
journal article
ABSTRACT
Histamine, signaling via the type 1 receptor (H1R), has been shown to suppress Th2 cytokine production by in vitro cultured T cells. We examined the role of H1R in allergic inflammation in vivo using a murine asthma model. Allergen-stimulated splenic T cells from sensitized H1R-/- mice exhibited enhanced Th2 cytokine production. Despite this Th2 bias, allergen-challenged H1R-/- mice exhibited diminished lung Th2 cytokine mRNA levels, airway inflammation, goblet cell metaplasia, and airway hyperresponsiveness (AHR). Restoration of pulmonary Th2 cytokines in H1R-/- mice by intranasal IL-4 or IL-13 restored inflammatory lung responses and AHR. Further investigation revealed that histamine acts as a T cell chemotactic factor and defective T cell trafficking was responsible for the absence of lung inflammation. Cultured T cells migrated in response to histamine in vitro, but this was ablated by blockade of H1R but not H2R. In vivo, allergen-specific WT but not H1R-/- CD4+ T cells were recruited to the lungs of naive recipients following inhaled allergen challenge. H1R-/- T cells failed to confer airway inflammation or AHR observed after transfer of WT T cells. Our data establish a role for histamine and H1R in promoting the migration of Th2 cells into sites of allergen exposure.
ACCESSION #
21123693

 

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