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IL-12-STAT4-IFN-gamma axis is a key downstream pathway in the development of IL-13-mediated asthma phenotypes in a Th2 type asthma model

Title
IL-12-STAT4-IFN-gamma axis is a key downstream pathway in the development of IL-13-mediated asthma phenotypes in a Th2 type asthma model
Authors
Kim, YSChoi, SJChoi, JPJeon, SGOh, SYLee, BJGho, YSLee, CGZhu, ZElias, JAKim, YK
POSTECH Authors
Gho, YS
Date Issued
Aug-2010
Publisher
KOREAN SOC MED BIOCHEMISTRY MOLECULAR BIOLOGY
Abstract
IL-4 and IL-13 are closely related cytokines that are produced by Th2 cells. However, IL-4 and IL-13 have different effects on the development of asthma phenotypes. Here, we evaluated downstream molecular mechanisms involved in the development of Th2 type asthma phenotypes. A murine model of Th2 asthma was used that involved intraperitoneal sensitization with an allergen (ovalbumin) plus alum and then challenge with ovalbumin alone. Asthma phenotypes, including airway-hyperresponsiveness (AHR), lung inflammation, and immunologic parameters were evaluated after allergen challenge in mice deficient in candidate genes. The present study showed that methacholine AHR and lung inflammation developed in allergen-challenged IL-4-deficient mice but not in allergen-challenged IL-13-deficient mice. In addition, the production of OVA-specific IgG2a and IFN-gamma-inducible protein (IP)-10 was also impaired in the absence of IL-13, but not of IL-4. Lung-targeted IFN-gamma over-expression in the airways enhanced methacholine AHR and non-eosinophilic inflammation
in addition, these asthma phenotypes were impaired in allergen-challenged IFN-gamma-deficient mice. Moreover, AHR, non-eosinophilic inflammation, and IFN-gamma expression were impaired in allergen-challenged 1L-12R beta 2- and STAT4-deficient mice
however, AHR and non-eosinophilic inflammation were not impaired in allergen-challenged IL-4R alpha-deficient mice, and these phenomena were accompanied by the enhanced expression of IL-12 and IFN-gamma. The present data suggest that IL-13-mediated asthma phenotypes, such as AHR and non-eosinophilic inflammation, in the Th2 type asthma are dependent on the IL-12-STAT4-IFN-gamma axis, and that these asthma phenotypes are independent of IL-4Ralpha-mediated signaling.
URI
http://oasis.postech.ac.kr/handle/2014.oak/25669
DOI
10.3858/EMM.2010.42.8.054
ISSN
1226-3613
Article Type
Article
Citation
EXPERIMENTAL AND MOLECULAR MEDICINE, vol. 42, no. 8, page. 533 - 546, 2010-08
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 GHO, YONG SONG
Dept of Life Sciences
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