title: TNF-alpha up-regulates matrix metalloproteinase-9 expression and activity in alveolar macrophages from patients with chronic obstructive pulmonary disease.
abstract: To study the effects of tumor necrosis factor (TNF)-alpha on matrix metalloproteinase (MMP)-9 expression and activity in alveolar macrophages (AM) and to investigate the role of NF-kappaB in the induction, AM were collected from bronchoalveolar lavage fluid (BALF) of healthy subjects and patients with chronic obstructive pulmonary disease (COPD). MMP-9 expression and activity were detected by semi-quantitative reverse transcription-polymerase chain reaction (RT-PCR), Western blotting and zymography. NF-kappaB activity was detected by electrophoretic mobility shift assay (EMSA). MMP-9 expression and activity induced by TNF-alpha in AM from healthy subjects or patients with COPD were significantly increased in a dose-dependent manner (P<0.05). NF-kappaB activity induced by TNF-alpha was significantly increased in AM from patients with COPD, and pyrrolidine dithiocarbamate (PDTC) and N-acetyl-L-cysteine (NAC) significantly inhibited the activation of NF-kappaB induced by TNF-alpha (P<0.05). The presents study suggested that the expression and activity of MMP-9 from AM can be induced by TNF-alpha, and TNF-alpha/NF-kappaB signal pathway may play an important role in the induction.
authors.affiliation: Department of Respiratory Medicine, Zhejiang Provincial People's Hospital, Hangzhou 310014, China.
authors.forename: Yaqing
authors.initials: Y
authors.lastname: Li
authors.forename: Zhenxiang
authors.initials: Z
authors.lastname: Zhang
authors.forename: Yongjian
authors.initials: Y
authors.lastname: Xu
authors.forename: Shengdao
authors.initials: S
authors.lastname: Xiong
authors.forename: Wang
authors.initials: W
authors.lastname: Ni
authors.forename: Shixin
authors.initials: S
authors.lastname: Chen
mesh_terms: D006801:Humans; D016676:Macrophages, Alveolar / Q000187:drug effects / Q000201:enzymology*; D020780:Matrix Metalloproteinase 9 / Q000378:metabolism*; D016328:NF-kappa B / Q000378:metabolism; D029424:Pulmonary Disease, Chronic Obstructive / Q000201:enzymology*; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology*
chemical_list: D016328:NF-kappa B; D014409:Tumor Necrosis Factor-alpha; C579270:MMP9 protein, human; D020780:Matrix Metalloproteinase 9