|
||
Institut de Génétique et de Biologie Moléculaire et Cellulaire, Centre National de la Recherche Scientifique/Institut National de
la Santé et de la Recherche Médicale/Université Louis Pasteur, BP 163, 67404 Illkirch Cedex, C.U. de Strasbourg, France; and * Service d'Anatomie Pathologique Générale, Hôpitaux Universitaires, Hôpital de Hautepierre, 67098 Strasbourg Cedex, France
Skin wound healing depends on cell migration and extracellular matrix remodeling. Both processes, which are necessary for reepithelization and restoration of the underlying connective tissue, are
believed to involve the action of extracellular proteinases. We screened cDNA libraries and we found that
six matrix metalloproteinase genes were highly expressed during rat skin wound healing. They were
namely those of stromelysin 1, stromelysin 3, collagenase 3, gelatinase A (GelA), gelatinase B, and membrane type-1 matrix metalloproteinase (MT1-MMP).
The expression kinetics of these MMP genes, the tissue
distribution of their transcripts, the results of cotransfection experiments in COS-1 cells, and zymographic analyses performed using microdissected rat wound tissues support the possibility that during cutaneous
wound healing pro-GelA and pro-gelatinase B are activated by MT1-MMP and stromelysin 1, respectively. Since MT1-MMP has been demonstrated to be a membrane-associated protein (Sato, H., T. Takino, Y. Okada, J. Cao, A. Shinagawa, E. Yamamoto, and M. Seiki. 1994. Nature (Lond.). 370: 61-65), our finding
that GelA and MT1-MMP transcripts were expressed
in stromal cells exhibiting a similar tissue distribution
suggests that MT1-MMP activates pro-GelA at the
stromal cell surface. This possibility is further supported by our observation that the processing of proGelA to its mature form correlated to the detection of
MT1-MMP in cell membranes of rat fibroblasts expressing the MT1-MMP and GelA genes. These observations, together with the detection of high levels of the
mature GelA form in the granulation tissue but not in
the regenerating epidermis, suggest that MT1-MMP
and GelA contribute to the restoration of connective
tissue during rat skin wound healing.
This article has been cited by other articles:
|
|