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Vesicle-associated membrane protein 7-mediated eosinophil degranulation promotes allergic airway inflammation in mice.


ABSTRACT: Eosinophil degranulation is a determining factor in allergy-mediated airway pathology. Receptor-mediated degranulation in eosinophils requires vesicle-associated membrane protein 7 (VAMP-7), a principal component of the SNARE fusion machinery. The specific contribution of eosinophil degranulation to allergen-induced airway responses remains poorly understood. We generated mice with VAMP-7 gene deficiency exclusively in eosinophils (eoCRE/V7) from a cross using eosinophil-specific Cre recombinase-expressing mice crossed with VAMP-7 f/f mice. Eosinophils from eoCRE/V7 mice showed deficient degranulation responses in vitro, and responses continued to be decreased following ex vivo intratracheal adoptive transfer of eoCRE/V7 eosinophils into IL-5/hE2/EPX -/- mice. Consistent with diminished degranulation responses, reduced airway hyperresponsiveness was observed in ovalbumin-sensitized and challenged eoCRE/V7 mice following methacholine inhalation. Therefore, VAMP-7 mediates eosinophil degranulation both in vitro and ex vivo, and this event augments airway hyperresponsiveness.

SUBMITTER: Willetts L 

PROVIDER: S-EPMC6123774 | biostudies-literature | 2018

REPOSITORIES: biostudies-literature

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Vesicle-associated membrane protein 7-mediated eosinophil degranulation promotes allergic airway inflammation in mice.

Willetts Lian L   Felix Lindsey C LC   Jacobsen Elizabeth A EA   Puttagunta Lakshmi L   Condjella Rachel M RM   Zellner Katie R KR   Ochkur Sergei I SI   Kim John D JD   Luo Huijun H   Lee Nancy A NA   Lee James J JJ   Moqbel Redwan R   Lacy Paige P  

Communications biology 20180629


Eosinophil degranulation is a determining factor in allergy-mediated airway pathology. Receptor-mediated degranulation in eosinophils requires vesicle-associated membrane protein 7 (VAMP-7), a principal component of the SNARE fusion machinery. The specific contribution of eosinophil degranulation to allergen-induced airway responses remains poorly understood. We generated mice with <i>VAMP-7</i> gene deficiency exclusively in eosinophils (<i>eoCRE/V7</i>) from a cross using eosinophil-specific <  ...[more]

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