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    Please use this identifier to cite or link to this item: http://ir.fy.edu.tw/ir/handle/987654321/6436

    Title: Expression and regulation of the macrophage inflammatory protein-1 alpha gene by nicotine in rat alveolar macrophages.
    Authors: CHONG Inn-Wen;LIN Shiu-Ru;HWANG Jhi-Jhu;HUANG Ming-Shyan;WANG Tung-Heng;HUNG Jen-Yu;PAULAUSKIS Joseph D.
    Contributors: 輔英科技大學 醫學檢驗生物技術系
    Keywords: Genetics;Vertebrata;Mammalia;Rodentia;Rat;Animal;Hyperoxides;Posttranscriptional modification;Gene expression;Gene;Macrophage inflammatory protein 1alpha;Inflammation;Pulmonary alveolus;Macrophage;Nicotine;Tobacco smoking
    Date: 2002-04-01
    Issue Date: 2010-10-12 16:39:59 (UTC+8)
    Abstract: Cigarette smoking causes inflammation mainly confined to the airway and lung. Nicotine is one of the primary constituents in cigarette smoke. Alveolar macrophages apparently play a pivotal role in mediating pulmonary inflammation via the production of chemokines. Macrophage inflammatory protein-1 alpha (MIP-1 alpha), a member of CC chemokines, has been shown to contribute to monocyte/macrophage and neutrophil chemotaxis and activation. Our previous work demonstrated that MIP-1 alpha mRNA expression in macrophages is induced by a variety of stimuli. In the present study, we further investigate whether nicotine can regulate the gene expression of MIP-1 alpha in macrophages and determine the mechanism leading to increased expression. A rat alveolar macrophage (RAM) cell line, NR8383, was treated with nicotine at a dose of 3.1, 31, 310 microM, or 3.1 mM. Northern blot analysis showed that the induction of MIP-1 alpha mRNA expression was dose-dependent. To define the time course of the inflammatory response, RAM cells were exposed to 31 microM nicotine, MIP-1 alpha mRNA was induced as early as 1 h after treatment, was maximally expressed at 4 and 6 hours, and reduced by 8 hours. Western blot analysis demonstrated a single band with an estimated molecular weight of 10 kD for MIP-1 alpha which was induced after nicotine treatment, suggesting that expression of MIP-1 alpha mRNA could reflect in protein synthesis. In addition. the increase in MIP-1 alpha mRNA expression induced by nicotine was attenuated by co-treatment with the antioxidant N-acetylcysteine (NAC), at doses of 10 and 20 mM, suggesting that the induction of MIP-1 alpha mRNA is mediated via the generation of reactive oxygen species (ROS). To further investigate transcriptional regulation of the MIP-1 alpha gene expression, RAM cells were exposed to nicotine. MIP-1 alpha mRNA levels were significantly increased in nuclear RNA preparations, indicating that transcriptional activation is involved in increased expression of MIP-1 alpha mRNA. Moreover, we performed RNA decay assay by measuring the half-life of MIP-1 alpha mRNA. Treatment of RAM cells with the transcriptional inhibitor actinomycin D following exposure to nicotine revealed that the half-life of MIP-1 alpha mRNA was markedly increased by nicotine treatment, supporting a role of post-transcriptional stabilization in MIP-1 alpha gene expression. These observations indicate that nicotine can induce MIP-1 alpha mRNA expression and protein synthesis in RAM cells, mediating, at least in part, via the generation of ROS. In addition, the increase in MIP-1 alpha mRNA level involves, both transcriptional activation and post-transcriptional stabilization.
    Relation: Eur Cytokine Netw 13(2),242-249
    Appears in Collections:[醫學檢驗生物技術系] 期刊論文

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