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Epitomics: The Rabbit Monoclonal Company
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J. Cell Biol., Volume 140, Number 6, March 23, 1998 1535-1541

In Vivo Evidence That the Stromelysin-3 Metalloproteinase Contributes in a Paracrine Manner to Epithelial Cell Malignancy

Régis Masson,* Olivier Lefebvre,* Agnès Noël,Dagger Mostapha El Fahime,* Marie-Pierre Chenard,par Corinne Wendling,* Florence Kebers,Dagger Marianne LeMeur,* Andrée Dierich,* Jean-Michel Foidart,Dagger Paul Basset,* and Marie-Christine Rio*

* 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; Dagger  Laboratoire de Biologie des Tumeurs et du Développement, University of Liège, 4000 Sart-Tilman, Liège, Belgium; and par  Service d'Anatomie Pathologique Générale, Hôpital de Hautepierre, Hôpitaux Universitaires de Strasbourg, 67098 Strasbourg Cedex, France

Stromelysin-3 (ST3; Basset, P., J.P. Bellocq, C. Wolf, I. Stoll, P. Hutin, J.M. Limacher, O.L. Podhajcer, M.P. Chenard, M.C. Rio, P. Chambon. 1990. Nature. 348:699-704) is a matrix metalloproteinase (MMP) expressed in mesenchymal cells located close to epithelial cells, during physiological and pathological tissue remodeling processes. In human carcinomas, high ST3 levels are associated with a poor clinical outcome, suggesting that ST3 plays a role during malignant processes. In this study we report the ST3 gene inactivation by homologous recombination. Although ST3 null mice (ST3-/-) were fertile and did not exhibit obvious alterations in appearance and behavior, the lack of ST3 altered malignant processes. Thus, the suppression of ST3 results in a decreased 7,12-dimethylbenzanthracene-induced tumorigenesis in ST3-/- mice. Moreover, ST3-/- fibroblasts have lost the capacity to promote implantation of MCF7 human malignant epithelial cells in nude mice (P < 0.008). Finally, we show that this ST3 paracrine function requires extracellular matrix (ECM)-associated growth factors. Altogether, these findings give evidence that ST3 promotes, in a paracrine manner, homing of malignant epithelial cells, a key process for both primary tumors and metastases. Therefore, ST3 represents an appropriate target for specific MMP inhibitor(s) in future therapeutical approaches directed against the stromal compartment of human carcinomas.


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