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Am J Physiol Lung Cell Mol Physiol 282: L115-L123, 2002;
1040-0605/02 $5.00
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Vol. 282, Issue 1, L115-L123, January 2002

TGF-beta isoform release and activation during in vitro bronchial epithelial wound repair

William J. Howat, Stephen T. Holgate, and Peter M. Lackie

Division of Respiratory, Cell and Molecular Biology, School of Medicine, University of Southampton, Southampton General Hospital, Southampton, SO16 6YD, United Kingdom

Restitution of an epithelial layer after environmental or biological damage is important to maintain the normal function of the respiratory tract. We have investigated the role of transforming growth factor (TGF)-beta isoforms in the repair of layers of 16HBE 14o- bronchial epithelial-derived cells after damage by multiple scoring. ELISA showed that both latent TGF-beta 1 and TGF-beta 2 were converted to their active forms 2 h after wounding. Time-lapse microscopy showed that the addition of TGF-beta 1, but not TGF-beta 2, progressively increased the rate of migration of damaged monolayers at concentrations down to 250 pg/ml. This increase was blocked by addition of a neutralizing TGF-beta 1 antibody. Phase-contrast microscopy and inhibition of proliferation with mitomycin C showed that proliferation was not required for migration. These results demonstrate that conversion of latent to active TGF-beta 1 and TGF-beta 2 during in vitro epithelial wound repair occurs quickly and that TGF-beta 1 speeds epithelial repair. A faster repair may be advantageous in preventing access of environmental agents to the internal milieu of the lung although the production of active TGF-beta molecules may augment subepithelial fibrosis.

transforming growth factor-beta ; 16HBE 14o- bronchial epithelial cell; cell migration; wound healing; primary bronchial epithelial cells


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