Abstract:
:Matrix metalloproteinases (MMPs) degrade extracellular matrix proteins, which may be responsible for enlargement of alveoli in chronic obstructive pulmonary disease (COPD) and remodeling of pulmonary tissue associated with chronic asthma. Here, we provide novel evidence that MMP-12 is expressed and secreted by normal human bronchial epithelial cell cultures (NHBECs) and reveal the regulation of MMP-12 gene expression by tumor necrosis factor-alpha (TNF-alpha), epidermal growth factor (EGF), and interferon gamma (IFN-gamma). Reverse transcription-polymerase chain reaction analyses demonstrated MMP-12 mRNA presence in unstimulated differentiated NHBEC cultures. Cultures stimulated independently with EGF or IFN-gamma failed to alter MMP-12 mRNA abundance, while TNF-alpha, TNF-alpha+EGF, or TNF-alpha+IFN-gamma elicited relatively early (6 h) peak increases in MMP-12 mRNA levels. Western blot analyses specifically indicated the presence of MMP-12 in differentiated NHBEC-conditioned media. These findings indicate that the bronchial epithelium may be an important source of elastolytic activity in COPD and tissue remodeling in chronic asthma.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Lavigne MC,Thakker P,Gunn J,Wong A,Miyashiro JS,Wasserman AM,Wei SQ,Pelker JW,Kobayashi M,Eppihimer MJdoi
10.1016/j.bbrc.2004.09.080subject
Has Abstractpub_date
2004-11-12 00:00:00pages
534-46issue
2eissn
0006-291Xissn
1090-2104pii
S0006-291X(04)02118-7journal_volume
324pub_type
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