| YKL-40 Induces IL-8 Expression from Bronchial Epithelium via MAPK (JNK and ERK) and NF-κB Pathways, Causing Bronchial Smooth Muscle Proliferation and Migration. | |
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MedLine Citation:
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PMID: 23197259 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Recently, the serum levels of YKL-40, a chitinase-like glycoprotein, have been shown to be significantly elevated in asthmatics and are associated with asthma severity. Although these studies raise the possibility that YKL-40 may influence asthma, the mechanisms remain unknown. This study firstly investigated the mechanisms involved in YKL-40-mediated inflammation in human bronchial epithelial cells (HBECs) and analyzed the soluble factors secreted by bronchial epithelial cells exposed to YKL-40 that were responsible for increasing proliferation and migration of primary normal human bronchial smooth muscle cells (BSMCs). YKL-40-induced inflammation was assayed in two HBECs (BEAS-2B cell line and primary HBECs). In addition, we treated BEAS-2B cells and HBECs with YKL-40 and added the conditioned culture media to BSMCs. The proliferation and migration of BSMCs were determined by premixed WST-1 cell proliferation reagent (Clontech Laboratories) and QCM chemotaxis migration assay (Millipore), respectively. Bronchial epithelial cells treated with YKL-40 resulted in a significant increase of IL-8 production, which was dependent on MAPK (JNK and ERK) and NF-κB pathways activation. YKL-40-induced IL-8 was found to further stimulate proliferation and migration of BSMCs, and the effects were inhibited after neutralizing IL-8. Through investigating the interaction of airway epithelium and smooth muscle, our findings implicate that YKL-40 may be involved in the inflammation of asthma by induction of IL-8 from epithelium, subsequently contributing to BSMC proliferation and migration. Moreover, inhibition of IL-8 signaling is a potential therapeutic target for YKL-40-induced inflammation and remodeling of asthma. |
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Authors:
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Hao Tang; Yu Sun; Zhaoquan Shi; Hai Huang; Zheng Fang; Jiquan Chen; Qingyu Xiu; Bing Li |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-11-28 |
Journal Detail:
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Title: Journal of immunology (Baltimore, Md. : 1950) Volume: - ISSN: 1550-6606 ISO Abbreviation: J. Immunol. Publication Date: 2012 Nov |
Date Detail:
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Created Date: 2012-11-30 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 2985117R Medline TA: J Immunol Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Department of Respiratory Medicine, Changzheng Hospital, Second Military Medical University, Shanghai 200003, People's Republic of China. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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