title: Multidrug-resistance (MDR) phenotype of human osteosarcoma cells evaluated by quantitative morphological and electron microscopy analyses.
abstract: Multidrug-resistant (MDR) variants of a human osteosarcoma cell line (U-2 OS) have been recently obtained by continuous exposure to doxorubicin (DX). The growth and phenotypic characteristics of these cell lines have been demonstrated to be related to the level of expression of P-glycoprotein. In this work, the morphological changes associated with MDR have been evaluated by quantitative image analysis and transmission electron microscopy. Resistant cells present morphological changes with respect to sensitive cells at both cytoplasmic and nuclear level. Some of these changes appear to be related to the degree of resistance but not to the direct presence of DX, since deprived cells maintain some modified characters, while others are partly lost. These findings suggest that DX exposure affects cell metabolism causing progressive changes of the cell morphotype.
authors.affiliation: Istituto di Citomorfologia Normale e Patologica, CNR, Chieti-Bologna, Italy.
authors.forename: N
authors.initials: N
authors.lastname: Zini
authors.forename: K
authors.initials: K
authors.lastname: Scotlandi
authors.forename: N
authors.initials: N
authors.lastname: Baldini
authors.forename: G
authors.initials: G
authors.lastname: Nini
authors.forename: P
authors.initials: P
authors.lastname: Sabatelli
authors.forename: N
authors.initials: N
authors.lastname: Maraldi
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000096:biosynthesis*; D001859:Bone Neoplasms / Q000235:genetics* / Q000473:pathology / Q000648:ultrastructure*; D002455:Cell Division / Q000187:drug effects; D002460:Cell Line; D002462:Cell Membrane / Q000648:ultrastructure; D002467:Cell Nucleus / Q000648:ultrastructure; D002843:Chromatin / Q000648:ultrastructure; D004317:Doxorubicin / Q000633:toxicity; D018432:Drug Resistance, Multiple; D005456:Fluorescent Dyes; D006570:Heterochromatin / Q000648:ultrastructure; D006801:Humans; D008854:Microscopy, Electron; D008856:Microscopy, Fluorescence; D012516:Osteosarcoma / Q000235:genetics* / Q000473:pathology*; D010641:Phenotype; D014407:Tumor Cells, Cultured
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D002843:Chromatin; D005456:Fluorescent Dyes; D006570:Heterochromatin; D004317:Doxorubicin