title: The metal-coordinated Casiopeína IIIEa induces the petite-like phenotype in Saccharomyces cerevisiae.
abstract: The Casiopeínas® are mixed chelate copper (II) complexes and promising antineoplastics agents against cancer cells and tumors in vitro and in vivo. However, the action mode of these compounds is poorly characterized. In this work the effect of the antineoplastic Casiopeína IIIEa on the metabolism and ultrastructure of the yeast Saccharomyces cerevisiae was investigated. Exposure of cells growing in rich or in low-iron medium to 5 μM of the compound decreased duplication time and reduced oxygen consumption. Those cells formed smaller colonies when growing in a non-fermentable carbon source and low-iron medium, and under the light microscope, multiple folds were observed along the plasma membrane accompanied with a reduction in the diameter of the yeast. These observations were confirmed under the electron microscope, which also revealed a slight reduction of the mitochondrial size. A correlation was found with smaller colonies exhibiting lower rates of oxygen consumption, and yeast labelled with fluorescent MitoTracker(TM) consistently exhibited reduced mitochondrial activity. It appears that Casiopeína IIIEa gives rise to smaller yeast and petite-like colonies by reducing the mitochondrial respiratory activity without significantly affecting the mitochondrial structure.
authors.affiliation: Departamento de Neurobiología Celular y Molecular, Instituto de Neurobiología, UNAM-Campus Juriquilla, Boulevard Juriquilla 3001, Juriquilla, Querétaro, México. lopezang@ninds.nih.gov
authors.forename: Angélica
authors.initials: A
authors.lastname: López-Rodríguez
authors.forename: Alfonso
authors.initials: A
authors.lastname: Cárabez-Trejo
authors.forename: Fernando
authors.initials: F
authors.lastname: Rosas-Sánchez
authors.forename: Carmen
authors.initials: C
authors.lastname: Mejía
authors.forename: Lena
authors.initials: L
authors.lastname: Ruiz-Azuara
authors.forename: Ricardo
authors.initials: R
authors.lastname: Miledi
authors.forename: Ataúlfo
authors.initials: A
authors.lastname: Martínez-Torres
mesh_terms: D000818:Animals; D008670:Metals / Q000737:chemistry*; D008930:Mitochondria, Liver / Q000378:metabolism; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000737:chemistry* / Q000494:pharmacology*; D010101:Oxygen Consumption; D010641:Phenotype; D051381:Rats; D012441:Saccharomyces cerevisiae / Q000166:cytology* / Q000187:drug effects* / Q000502:physiology
chemical_list: D008670:Metals; D009942:Organometallic Compounds