title: Subpopulations of MCF7 cells separated by Percoll gradient centrifugation: a model to analyze the heterogeneity of human breast cancer.
abstract: Exponentially growing MCF7 human breast cancer cells were separated in Percoll gradients into six different fractions of increasing density (A to F). These fractions could be subcultured and were found to contain different cellular subpopulations as defined by the following criteria: ability to generate other cellular subpopulations; growth rate; DNA synthesis; and expression of estrogen receptors, ras oncogene-encoded protein p21, and carcinoembryonic antigen. One of the minor fractions (E), which contained about 5% of the total cell number, appeared to contain the stem cells, on the basis of the following criteria: (i) its ability to reproduce the other cellular subpopulations, (ii) its high rate of growth and DNA synthesis, and (iii) the inability of the other subpopulations to generate it. The most differentiated subpopulation appeared to be the densest one (F), since it was the slowest growing and appeared to be the end point of the other subpopulations.
authors.affiliation: Instituto de Investigaciones Bioquimicas Fundacion Campomar, Buenos Aires, Argentina.
authors.forename: M
authors.initials: M
authors.lastname: Resnicoff
authors.forename: E E
authors.initials: EE
authors.lastname: Medrano
authors.forename: O L
authors.initials: OL
authors.lastname: Podhajcer
authors.forename: A I
authors.initials: AI
authors.lastname: Bravo
authors.forename: L
authors.initials: L
authors.lastname: Bover
authors.forename: J
authors.initials: J
authors.lastname: Mordoh
mesh_terms: D001943:Breast Neoplasms / Q000473:pathology*; D002272:Carcinoembryonic Antigen / Q000032:analysis; D002469:Cell Separation / Q000379:methods*; D002499:Centrifugation, Density Gradient; D003260:Contact Inhibition; D004261:DNA Replication; D005260:Female; D006801:Humans; D008954:Models, Biological; D009363:Neoplasm Proteins / Q000032:analysis; D009376:Neoplasms, Hormone-Dependent / Q000473:pathology*; D011205:Povidone; D011960:Receptors, Estrogen / Q000032:analysis; D012822:Silicon Dioxide; D014407:Tumor Cells, Cultured / Q000032:analysis / Q000145:classification* / Q000473:pathology
chemical_list: D002272:Carcinoembryonic Antigen; D009363:Neoplasm Proteins; D011960:Receptors, Estrogen; C016039:Percoll; D012822:Silicon Dioxide; D011205:Povidone