House Dust Mite Extract Induces Interleukin-9 Expression in Human Eosinophils
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- Fujisawa Takao
- Institute for Clinical Research, Mie National Hospital
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- Katsumata Hajime
- Institute for Clinical Research, Mie National Hospital
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- Kato Yoshiko
- Institute for Clinical Research, Mie National Hospital
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Background: Eosinophils play a pivotal role in allergic inflammation. Recent evidence suggests that they not only function as terminal effector cells but have potential to interact with allergen and initiate immune responses. We investigated cytokine production from eosinophils through direct interaction with a major allergen, house dust mite (HDM).<br> Methods: Purified eosinophils from HDM-sensitized or non-sensitized donors were cultured with HDM extract or lipopolysaccharide (LPS) for 18 or 40 h. A panel of cytokine gene expression in eosinophils was examined by means of real-time RT-PCR. Released cytokines in the culture supernatants were assessed with a specific ELISA. In some experiments, HDM was pretreated with protease inhibitors, then added to the culture. Cytokines tested for gene expression were interleukin (IL)-2, 4, 6, 7, 8, 9, 10, 11, 12, 13, 16,17, 18, TGF-β1 and GM-CSF,.<br> Results: LPS induced small enhancement of GM-CSF gene expression at 18 h. At 40 h, HDM induced about 60-fold enhancement of IL-9 gene expression. IL-9 protein was also detected in the culture supernatants at 60h. Those reactions were observed regardless of HDM sensitization status of the donors. HDM-induced IL-9 expression was completely inhibited with a serine protease inhibitor, AEBSF, not with a cysteine protease inhibitor, E-64.<br> Conclusions: Accumulated eosinophils in the airways in asthma may directly react with HDM and produce IL-9 to further promote Th2-type immune responses. Protease-activated receptor 2, a ligand for serine proteases, which contained in HDM, may be involved in the reaction.<br>
収録刊行物
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- Allergology International
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Allergology International 57 (2), 141-146, 2008
一般社団法人日本アレルギー学会
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詳細情報 詳細情報について
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- CRID
- 1390282679608798080
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- NII論文ID
- 10021246553
- 130004476967
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- NII書誌ID
- AA11091750
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- ISSN
- 14401592
- 13238930
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可