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Journal of Cell Science, Vol 109, Issue 9 2207-2219, Copyright © 1996 by Company of Biologists
JOURNAL ARTICLES |
S Boland, E Boisvieux-Ulrich, O Houcine, A Baeza-Squiban, M Pouchelet, D Schoevaert and F Marano
Laboratoire de Cytophysiologie et de Toxicologie Cellulaire, Universite Paris 7 Denis Diderot, France.
In the present study we have investigated the effects of transforming growth factor beta (TGF beta 1) on rabbit tracheal epithelial cells in primary culture, with respect to cell proliferation and differentiation. Epithelial tracheal cells derived from an explant plated on an extracellular matrix, formed an outgrowth resulting from cell division and cell migration. TGF beta 1 treatment produced a negative effect on cell proliferation, but in contrast, promoted a marked enhancement of cell migration and increase in outgrowth surface. TGF beta 1 induced marked cell shape changes, including cell spreading and lack of stratification, associated with reduced cell-cell contacts and increased cell-substratum anchorage, as seen by electron microscopic observations. Immunocytological studies demonstrated major TGF beta 1-induced actin cytoskeleton reorganization, corresponding to the development of a basal stress fiber network and decrease of the annular cell border, without affecting the tight junctions. The migratory phenotype was approached by microcinematography which clearly showed that TGF beta 1 triggered a stimulatory effect on migration of epithelial cells, determined using an image analyzing system. Present findings suggest a beneficial role for TGF beta 1 during wound healing in providing the acquisition of a migratory phenotype, with a higher capacity to migrate either on collagen or on different extracellular matrix components including laminin and fibronectin. Conversely, present data are not consistent with a squamous response to TGF beta 1, since metaplastic differentiation did not occur, as characterized by cytokeratin expression and cross-linked envelopes formation.
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