title: A cyclic peptide derived from alpha-fetoprotein inhibits the proliferative effects of the epidermal growth factor and estradiol in MCF7 cells.
abstract: A cyclic peptide derived from the active domain of alpha-fetoprotein (AFP) significantly inhibited the proliferation of MCF7 cells stimulated with the epidermal growth factor (EGF) or estradiol (E2). The action of these three agents on cell growth was independent of the presence of calf serum in the culture medium. Our results demonstrated that the cyclic peptide interfered markedly with the regulation of MAPK by activated c-erbB2. The cyclic peptide showed no effect on the E2-stimulated release of matrix metalloproteinases 2 and 9 nor on the shedding of heparin-binding EGF into the culture medium. We propose that the AFP-derived cyclic peptide represents a valuable novel antiproliferative agent for treating breast cancer.
authors.affiliation: Laboratorio de Hormonas y Receptores, INTA-Universidad de Chile, Santiago, Chile.
authors.forename: Cristian
authors.initials: C
authors.lastname: Torres
authors.forename: Elmer
authors.initials: E
authors.lastname: Antileo
authors.forename: Maráa José
authors.initials: MJ
authors.lastname: Epuñán
authors.forename: Ana María
authors.initials: AM
authors.lastname: Pino
authors.forename: Luis Emilio
authors.initials: LE
authors.lastname: Valladares
authors.forename: Walter Daniel
authors.initials: WD
authors.lastname: Sierralta
mesh_terms: D015153:Blotting, Western; D001943:Breast Neoplasms / Q000378:metabolism* / Q000473:pathology; D049109:Cell Proliferation; D004815:Epidermal Growth Factor / Q000494:pharmacology*; D004958:Estradiol / Q000494:pharmacology*; D004967:Estrogens / Q000494:pharmacology; D005260:Female; D005455:Fluorescent Antibody Technique; D006801:Humans; D020782:Matrix Metalloproteinases / Q000378:metabolism; D020928:Mitogen-Activated Protein Kinases / Q000378:metabolism; D010456:Peptides, Cyclic / Q000378:metabolism*; D018719:Erb-b2 Receptor Tyrosine Kinases / Q000378:metabolism; D014407:Tumor Cells, Cultured; D000509:alpha-Fetoproteins / Q000378:metabolism*
chemical_list: D004815:Epidermal Growth Factor; D004958:Estradiol; D004967:Estrogens; D020782:Matrix Metalloproteinases; D020928:Mitogen-Activated Protein Kinases; D010456:Peptides, Cyclic; D018719:Erb-b2 Receptor Tyrosine Kinases; D000509:alpha-Fetoproteins