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Enhanced expression of urocortin in lung tissues of rats with allergic asthma.

Authors: Wu, Y  Zhou, H  Xu, Y  Li, S 
Citation: Wu Y, etal., Biochem Biophys Res Commun. 2006 Mar 10;341(2):532-40. Epub 2006 Jan 13.
Pubmed: (View Article at PubMed) PMID:16427607
DOI: Full-text: DOI:10.1016/j.bbrc.2005.12.214

Bronchial asthma is defined as a chronic airway inflammatory disease characterized by sustained activation of many inflammatory cells including mast cells. Urocortin (UCN) is synthesized and secreted by human mast cells and activated mast cells release more UCN. On the other hand, UCN can induce mast cell degranulation and generation of many proinflammatory factors. The purpose of this study was to examine the expression profile of UCN in rat lung with allergic asthma. Twenty-four male Sprague-Dawley rats were allocated to normal control, asthma model, and dexamethasone group, respectively. Animals were actively sensitized by subcutaneous injection of ovalbumin (OVA) and challenged by an aerosol of 1% OVA 2 weeks after sensitization. Both UCN mRNA and peptide were expressed in normal rat lungs. Rats in asthma model group developed severe infiltration of inflammatory cells and inflammation in airway, together with a significantly up-regulated expression of urocortin mRNA detected by semi-quantitative reverse transcriptase-polymerase chain reaction and peptide measured both by immunohistochemistry and Western blot analysis. In contrast, treatment with dexamethasone resulted in markedly ameliorated airway inflammation and alleviated airway inflammatory cell infiltration, coupled with a significantly decreased urocortin expression. Regression analysis revealed a positive correlation between urocortin expression and the number of inflammatory cells in bronchoalveolar lavage fluid (P<0.01). In the present study, we first demonstrated that UCN was locally produced in rat lungs and expressed more pronouncedly in inflammatory airway of asthmatic rats. Glucocorticoid treatment markedly reduced the production of UCN in asthmatic lung tissues. Peripherally produced UCN in lung may act as a possible local autocrine and paracrine immune-inflammatory mediator in inflammatory airway of allergic asthma rats.

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CRRD Object Information
CRRD ID: 1642781
Created: 2007-10-15
Species: All species
Last Modified: 2007-10-15
Status: ACTIVE



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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.