Human bronchial epithelial cells express and secrete MMP-12.

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.

authors

Lavigne MC,Thakker P,Gunn J,Wong A,Miyashiro JS,Wasserman AM,Wei SQ,Pelker JW,Kobayashi M,Eppihimer MJ

doi

10.1016/j.bbrc.2004.09.080

subject

Has Abstract

pub_date

2004-11-12 00:00:00

pages

534-46

issue

2

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(04)02118-7

journal_volume

324

pub_type

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