Abstract:
:Eosinophilic bronchitis is an essential component of bronchial asthma, and eosinophils play an important role. We studied the effect of eosinophils on cell surface plasmin generation by bronchial epithelial cells, because plasmin is thought to be involved in bronchial tissue repair/remodeling by means of fibrinolysis and the activation of proteases such as matrix metalloproteases. Plasmin was generated from exogenous plasminogen on the cell surface of cultured bronchial epithelial cells, NCI-H292. Transforming growth factor beta (TGF-beta) treatment resulted in reduced cell surface plasmin generation and a large increase in plasminogen activator inhibitor-type 1 (PAI-1) antigen production in NCI-H292 cells, whereas no conspicuous effects were observed with IL-1 beta and TNF alpha treatment (regulators in pulmonary epithelial cells). On the other hand, this cell surface plasmin generation was reduced by co-incubation with Eol-1, an eosinophil cell line. The addition of TGF-beta antisense and anti-TGF-beta antibodies attenuated this adverse effect of Eol-1 cell co-incubation. These data suggest that eosinophils play an inhibitory role on cell surface plasmin generation by bronchial epithelial cells by means of the up-regulation of PAI-1 expression induced by TGF-beta. Therefore, the accumulation of eosinophils in bronchial walls is thought to be involved in bronchial tissue repair/remodeling in asthma through this protease network.
journal_name
Lungjournal_title
Lungauthors
Hara K,Hasegawa T,Ooi H,Koya T,Tanabe Y,Tsukada H,Igarashi K,Suzuki E,Arakawa M,Gejyo Fdoi
10.1007/s004080000042keywords:
subject
Has Abstractpub_date
2001-01-01 00:00:00pages
9-20issue
1eissn
0341-2040issn
1432-1750journal_volume
179pub_type
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