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Journal of Cell Science, Vol 106, Issue 3 869-878, Copyright © 1993 by Company of Biologists
JOURNAL ARTICLES |
MA Matthay, JP Thiery, F Lafont, F Stampfer and B Boyer
Laboratoire de Physiopathologie du Developpement, CNRS URA 1337, Paris, France.
The effects of growth factors on epithelial cell motility and dispersion have been examined on an immortalized human mammary epithelial cell line, the 184A1 nontumorigenic cell line. Among all the molecules tested, epidermal growth factor (EGF) and transforming growth factor-alpha (TGF-alpha) were demonstrated to stimulate an increase in mammary epithelial cell motility and wound closure that was associated with a morphological transformation of the cells and was accompanied by modifications in cell-cell and cell-substrate adhesion systems. The EGF-induced increase in cell motility and monolayer wound closure occurred over a 24 hour period and was not dependent on an increase in cell number. The effect of EGF was abolished by inhibiting alpha 2 integrins with specific antibodies, indicating that part of the mechanism for the increase in cell motility and accelerated wound closure depends on alpha 2 integrin functional expression. After 72 hours of exposure to EGF, the EGF-induced alterations in cell morphology, motility and cell adhesion systems underwent a spontaneous reversion that was correlated with a 10-fold reduction in the number of EGF receptors. The ability to regulate the scattering response induced by growth factors might be an important feature distinguishing normal epithelial cells from their tumoral counterparts.
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