title: Invasive phenotype of MCF10A cells overexpressing c-Ha-ras and c-erbB-2 oncogenes.
abstract: Infection with erbB-2 (E) of Ha-ras (H) oncogene-transfected cells has been previously shown to cooperatively induce anchorage-independent growth of the MCF10A human mammary epithelial cell line in vitro, but not to induce nude mouse tumorigenicity. Here we show that oncogene-transformed MCF10A are able to halt in the lungs of nude mice, a sign of organ colonization potential. We have therefore studied the transformants for in vitro migratory and invasive properties known to correlate with the metastatic potential of human mammary carcinoma cells in nude mice. MCF10A transfected with Ha-ras, infected with a recombinant retroviral vector containing the human c-erB-2 proto-oncogene (MCF10A-HE cells), show a higher invasive index than either the single transfectant (MCF10A-H) or MCF10A-erB-2(MCF10A-E) cells in the Boyden chamber chemotaxis and chemoinvasion assays. The MCF10A-HE cells also adopted an invasive stellate growth pattern when plated or embedded in Matrigel, in contrast to the spherical colonies formed by the single transformants MCF10A-H, MCF10A-E, and the parental cells. Dot-blot analysis of gelatinase A and TIMP-2 mRNA levels revealed increasing gelatinase A mRNA levels (HE > E > H > MCF10A) and reduced TIMP-2 expression in both single and double transformants. Furthermore, MCF10A-HE cells show more MMP-2 activity than parental MCF10A cells or the single transformants. CD44 analysis revealed differential isoform banding for the MCF10A-HE cells compared to parental cells, MCF10A-H and MCF10A-E, accompanied by increased binding of hyaluronan by the double transformants. Our results indicate that erB-2 and Ha-ras co-expression can induce a more aggressive phenotype in vitro, representative of the malignancy of mammary carcinomas.
authors.affiliation: Istituto Nazionale per la Ricerca sul Cancro, Genoa, Italy.
authors.forename: D
authors.initials: D
authors.lastname: Giunciuglio
authors.forename: M
authors.initials: M
authors.lastname: Culty
authors.forename: G
authors.initials: G
authors.lastname: Fassina
authors.forename: L
authors.initials: L
authors.lastname: Masiello
authors.forename: A
authors.initials: A
authors.lastname: Melchiori
authors.forename: G
authors.initials: G
authors.lastname: Paglialunga
authors.forename: G
authors.initials: G
authors.lastname: Arand
authors.forename: F
authors.initials: F
authors.lastname: Ciardiello
authors.forename: F
authors.initials: F
authors.lastname: Basolo
authors.forename: E W
authors.initials: EW
authors.lastname: Thompson
mesh_terms: D000818:Animals; D001943:Breast Neoplasms / Q000378:metabolism* / Q000473:pathology; D002461:Cell Line, Transformed; D005260:Female; D018093:Gelatinases / Q000096:biosynthesis; D018014:Gene Transfer Techniques; D006801:Humans; D018960:Hyaluronan Receptors / Q000096:biosynthesis; D008175:Lung Neoplasms / Q000378:metabolism* / Q000473:pathology; D020778:Matrix Metalloproteinase 2; D008666:Metalloendopeptidases / Q000096:biosynthesis; D051379:Mice; D008819:Mice, Nude; D009361:Neoplasm Invasiveness; D009368:Neoplasm Transplantation; D015689:Oncogene Protein p21(ras) / Q000096:biosynthesis* / Q000235:genetics; D014176:Protein Biosynthesis; D000090063:Proto-Oncogene Mas; D018719:Erb-b2 Receptor Tyrosine Kinases / Q000096:biosynthesis* / Q000235:genetics; D019716:Tissue Inhibitor of Metalloproteinase-2
chemical_list: D018093:Gelatinases; D018960:Hyaluronan Receptors; D020778:Matrix Metalloproteinase 2; D008666:Metalloendopeptidases; D015689:Oncogene Protein p21(ras); D000090063:Proto-Oncogene Mas; D018719:Erb-b2 Receptor Tyrosine Kinases; D019716:Tissue Inhibitor of Metalloproteinase-2; C000715470:MAS1 protein, human