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Published in: Respiratory Research 1/2006

Open Access 01-12-2006 | Research

Allergens induce enhanced bronchoconstriction and leukotriene production in C5 deficient mice

Authors: Laura McKinley, Jiyoun Kim, Gerald L Bolgos, Javed Siddiqui, Daniel G Remick

Published in: Respiratory Research | Issue 1/2006

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Abstract

Background

Previous genetic analysis has shown that a deletion in the complement component 5 gene-coding region renders mice more susceptible to allergen-induced airway hyperresponsiveness (AHR) due to reduced IL-12 production. We investigated the role of complement in a murine model of asthma-like pulmonary inflammation.

Methods

In order to evaluate the role of complement B10 mice either sufficient or deficient in C5 were studied. Both groups of mice immunized and challenged with a house dust extract (HDE) containing high levels of cockroach allergens. Airways hyper-reactivity was determined with whole-body plesthysmography. Bronchoalveolar lavage (BAL) was performed to determine pulmonary cellular recruitment and measure inflammatory mediators. Lung homogenates were assayed for mediators and plasma levels of IgE determined. Pulmonary histology was also evaluated.

Results

C5-deficient mice showed enhanced AHR to methylcholine challenge, 474% and 91% increase above baseline Penh in C5-deficient and C5-sufficient mice respectively, p < 0.001. IL-12 levels in the lung homogenate (LH) were only slightly reduced and BAL IL-12 was comparable in C5-sufficient and C5-deficient mice. However, C5-deficient mice had significantly higher cysteinyl-leukotriene levels in the BAL fluid, 1913 +/- 246 pg/ml in C5d and 756 +/- 232 pg/ml in C5-sufficient, p = 0.003.

Conclusion

These data demonstrate that C5-deficient mice show enhanced AHR due to increased production of cysteinyl-leukotrienes.
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Metadata
Title
Allergens induce enhanced bronchoconstriction and leukotriene production in C5 deficient mice
Authors
Laura McKinley
Jiyoun Kim
Gerald L Bolgos
Javed Siddiqui
Daniel G Remick
Publication date
01-12-2006
Publisher
BioMed Central
Published in
Respiratory Research / Issue 1/2006
Electronic ISSN: 1465-993X
DOI
https://doi.org/10.1186/1465-9921-7-129

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