title: Vincristine regulates the phosphorylation of the antiapoptotic protein HSP27 in breast cancer cells.
abstract: Vincristine is an antitumor drug that inhibits microtubule polymerization, causes G2/M arrest and induces apoptosis. 2D-PAGE and MALDI-TOF-MS analysis of vincristine effects on MCF7 cells, revealed a vincristine upregulated form and a vincristine downregulated form of the antiapoptotic protein HSP27. These findings linked to the lack of vincristine effect over HSP27 mRNA, suggest a protein post-translational modification. Further assays indicated the presence of a phosphorylated peptide, containing serine 82, only in the vincristine upregulated form. Serine 82 phosphorylation was confirmed using specific antibodies. Thus, phosphorylation of HSP27 may play a role in the cellular response to vincristine.
authors.affiliation: Departamento de Bioquimica y Biología Molecular, Instituto Universitario de Oncología del Principado de Asturias (I.U.O.P.A), Universidad de Oviedo, 33071 Oviedo, Spain.
authors.forename: Pedro
authors.initials: P
authors.lastname: Casado
authors.forename: Pedro
authors.initials: P
authors.lastname: Zuazua-Villar
authors.forename: Eva
authors.initials: E
authors.lastname: del Valle
authors.forename: Carlos
authors.initials: C
authors.lastname: Martínez-Campa
authors.forename: Pedro S
authors.initials: PS
authors.lastname: Lazo
authors.forename: Sofía
authors.initials: S
authors.lastname: Ramos
mesh_terms: D000595:Amino Acid Sequence; D000972:Antineoplastic Agents, Phytogenic / Q000494:pharmacology*; D001483:Base Sequence; D001943:Breast Neoplasms / Q000378:metabolism* / Q000473:pathology; D045744:Cell Line, Tumor; D017931:DNA Primers; D055551:HSP27 Heat-Shock Proteins; D006360:Heat-Shock Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D018832:Molecular Chaperones; D008969:Molecular Sequence Data; D009363:Neoplasm Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D010766:Phosphorylation; D011499:Protein Processing, Post-Translational; D020543:Proteome; D012694:Serine / Q000378:metabolism; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D014750:Vincristine / Q000494:pharmacology*
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D017931:DNA Primers; D055551:HSP27 Heat-Shock Proteins; C057725:HSPB1 protein, human; D006360:Heat-Shock Proteins; D018832:Molecular Chaperones; D009363:Neoplasm Proteins; D020543:Proteome; D012694:Serine; D014750:Vincristine