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KMID : 1225720130050060377
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Allergy, Asthma & Immunology Research : AAIR
2013 Volume.5 No. 6 p.377 ~ p.382
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IL-13 R110Q, a Naturally Occurring IL-13 Polymorphism, Confers Enhanced Functional Activity in Cultured Human Bronchial Smooth Muscle Cells
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Ya-fang He
Li Hua
Yi-xiao Bao
Quan-hua Liu
Yi Chu
Ding-zhu Fang
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Abstract
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Purpose:Interleukin (IL)-13, a Th2-type cytokine, plays a pivotal role in the pathogenesis of asthma through its direct effects on airway smooth muscles. A naturally occurring IL-13 polymorphism, R110Q, is strongly associated with increased total serum IgE levels and asthma. In the present study, we aimed to determine whether the IL-13 R110Q variant would display different biochemical properties or altered functions in comparison with wild-type (WT) IL-13 in cultured human bronchial smooth muscle cells (hBSMCs).
Methods:Culture supernatants and cell proteins were collected from cultured hBSMCs that were treated with 50 ng/mL IL-13 or IL-13 R110Q for 24 hours. Eotaxin released into hBSMC culture medium was determined by ELISA. The expression levels of the high-affinity IgE receptor (FcεRI) α-chain, smooth muscle-specific actin alpha chain (α-SMA), smooth muscle myosin heavy chain (SmMHC), and calreticulin in the cells were measured on Western blots.
Results:Compared with WT IL-13, treatment with the IL-13 R110Q variant resulted in a significant increase in eotaxin release as well as significant, although modest, increases in the expression levels of α-SMA, SmMHC, calreticulin, and FcεRI α-chain.
Conclusions:The results of the present study suggenst that the IL-13 R110Q variant may enhance enhanced functional activities in hBSMCs.
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KEYWORD
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IL-13, polymorphisms, bronchial smooth muscle cells, functional activity
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