國家衛生研究院 NHRI:Item 3990099045/5986
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    題名: Elastases from inflammatory and dendritic cells mediate ultrafine carbon black induced acute lung destruction in mice
    作者: Chang, CC;Chen, CY;Chiu, HF;Dai, SX;Liu, MY;Yang, CY
    貢獻者: Division of Environmental Health and Occupational Medicine
    摘要: Context: Exposure to ultrafine particles (< 100 nm in diameter) is postulated to cause chronic obstructive pulmonary disease (COPD). However, the mechanism remains to be elucidated. Objective: We aimed to evaluate whether ultrafine particle exposure causes the infiltration of inflammatory and dendritic cells (DCs) with increased elastase activity, contributing to lung parenchymal destruction. Materials and methods: C57BL/6 male mice were intratracheally instilled with 300 mu g ultrafine carbon black (ufCB; 14 nm in diameter), and sacrificed at 1, 3, 7 and 14 d post-exposure. Differential cell counts, elastase activities, and desmosine and hydroxyproline in bronchoalveolar (BAL) fluid were determined. Immunofluorescent staining and flow cytometry analysis determined the cell origin of macrophage metalloelastase (MMP-12). Anti-neutrophil antibody was applied to assess the contribution of elastase in ufCB induced lung destruction. Results: ufCB exposure led to significant increases in neutrophils, mononuclear cells and total proteins in BAL fluid. Desmosine and hydroxyproline were significantly increased in the ufCB group. Elastase activities were found to be significantly elevated, with both neutrophil elastase and MMP-12 peaking at 3 d post-exposure. Flow cytometry analysis demonstrated that pulmonary infiltrations of MMP-12 positive DCs, including Langerhans cells-derived DCs, occurred at 3 d and 7 d, while macrophage infiltration was obvious starting at 1 d. Anti-neutrophil antibody significantly reduced neutrophil elastase activity and prevented the increases in BAL desmosine and hydroxyproline following ufCB exposure. Conclusion: For the first time we demonstrate the infiltration of Langerhans and myeloid dendritic cells, and show that elastase production contributes to pulmonary destruction following exposure to ultrafine particles.
    日期: 2011-08
    關聯: Inhalation Toxicology. 2011 Aug;23(10):616-626.
    Link to: http://dx.doi.org/10.3109/08958378.2011.598965
    JIF/Ranking 2023: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=NHRI&SrcApp=NHRI_IR&KeyISSN=0895-8378&DestApp=IC2JCR
    Cited Times(WOS): https://www.webofscience.com/wos/woscc/full-record/WOS:000294259000004
    Cited Times(Scopus): http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=80052104769
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