title: Fibronectin fragments induce MMP activity in mouse mammary epithelial cells: evidence for a role in mammary tissue remodeling.
abstract: Mammary gland form and function are regulated by interactions between epithelium and extracellular matrix. Major glycoprotein components of extracellular matrix have been identified that give survival, proliferation and differentiation signals to mammary epithelial cells. We provide evidence that proteolytic fragments of the extracellular matrix glycoprotein, fibronectin, suppress growth and can promote apoptosis of mouse mammary epithelial cells. During mammary gland involution, total fibronectin and fibronectin fragment levels are increased. The peak levels of fibronectin protein and fragments are observed 4-6 days post-weaning, coincident with the peak in epithelial cell death. Using a model for hormone withdrawal-induced death of mammary epithelium, elevated levels of fibronectin proteolytic fragments were associated with apoptosis in TM-6 cells, a tumorigenic mouse mammary epithelial cell line. Treatment of TM-6 cells with exogenous fibronectin fragments (FN120) reduced cell number, and induced apoptosis and matrix degrading protease activity. Inhibition of matrix protease activity rescued TM-6 cell viability, indicating that FN120-induced cell loss is mediated through matrix protease activity. In a three-dimensional model for mammary gland development, FN120 reduced alveolar-like and promoted ductal-like development by a matrix protease-dependent mechanism. These data suggest that during post-lactational involution, fibronectin fragments may contribute to epithelial cell loss and dissolution of mammary alveoli by inducing matrix degrading proteinases.
authors.affiliation: Center for Cancer Causation and Prevention, AMC Cancer Research Center, Denver, CO 80214, USA. schedinp@amc.org schedinp@amc.org
authors.forename: P
authors.initials: P
authors.lastname: Schedin
authors.forename: R
authors.initials: R
authors.lastname: Strange
authors.forename: T
authors.initials: T
authors.lastname: Mitrenga
authors.forename: P
authors.initials: P
authors.lastname: Wolfe
authors.forename: M
authors.initials: M
authors.lastname: Kaeck
mesh_terms: D000818:Animals; D017209:Apoptosis / Q000502:physiology; D002452:Cell Count; D002464:Cell Migration Inhibition; D017077:Culture Media, Conditioned; D004847:Epithelial Cells / Q000201:enzymology* / Q000378:metabolism / Q000502:physiology; D005109:Extracellular Matrix / Q000201:enzymology / Q000378:metabolism; D005260:Female; D005353:Fibronectins / Q000378:metabolism / Q000502:physiology*; D006131:Growth Inhibitors / Q000378:metabolism / Q000502:physiology; D007774:Lactation / Q000502:physiology; D008321:Mammary Glands, Animal / Q000166:cytology / Q000201:enzymology* / Q000378:metabolism / Q000502:physiology*; D008666:Metalloendopeptidases / Q000037:antagonists & inhibitors / Q000096:biosynthesis* / Q000502:physiology; D051379:Mice; D008807:Mice, Inbred BALB C; D010446:Peptide Fragments / Q000378:metabolism / Q000502:physiology*; D011388:Prolactin / Q000502:physiology; D014407:Tumor Cells, Cultured
chemical_list: D017077:Culture Media, Conditioned; D005353:Fibronectins; D006131:Growth Inhibitors; D010446:Peptide Fragments; D011388:Prolactin; D008666:Metalloendopeptidases