title: Interactions Between Antibody-Coated Iron Micro-Particles and Leukemic Cells as seen by Electron Microscopy.
abstract: An electron microscopy study was performed to visualize the interactions between monoclonal antibodies (MoAbs) coated to ferromagnetic microparticles and leukemic cells. The properties of this specific reagent used for the efficient purging of residual leukemic cells from autografts before autologuous bone marrow transplantation (ABMT) have been previously reported. Incubation of a CD10+ NALM6- cell suspension with CD10 or CD8 MoAb conjugated particles was performed following a time-course schedule ranging from 0 to 90 min. at 4°C and 37°C. Transmission electron microscopy demonstrated that, although the CD10 MoAb-particles complex linked to the cell surface only at 4°C, they readily penetrated into cells at 37°C. In contrast, after incubation with CD8 MoAb-particles, no iron particles were seen at the cell surface, or within the cells no matter what the temperature and duration of the incubation were. This observation offers the unique opportunity to deliver a pharmaceutical agent crosslinked to the same magnetic carrier inside a cell, using an interesting site-specific drug delivery concept.
authors.affiliation: a Dept. Hématologie, Service de Médicine Interne et Laboratoire d'Investigation Clinique H. Tagnon, Brussels, Belgium.
authors.forename: C J
authors.initials: CJ
authors.lastname: Bieva
authors.affiliation: b Laboratoire de Cytologie et de Cancérologie Expérimentale, Faculté de Médecine, Université Libre de Bruxelles, Brussels, Belgium.
authors.forename: R
authors.initials: R
authors.lastname: Mosselmans
authors.affiliation: a Dept. Hématologie, Service de Médicine Interne et Laboratoire d'Investigation Clinique H. Tagnon, Brussels, Belgium.
authors.forename: F V
authors.initials: FV
authors.lastname: Brugghen
authors.affiliation: d Dept. of Pediatrics, Division of Hematology/Oncology, University of Florida, Gainesville, USA.
authors.forename: A
authors.initials: A
authors.lastname: Kedar
authors.affiliation: e Interdisciplinary Center for Biotechnology Research, University of Florida, Gainesville, USA.
authors.forename: G
authors.initials: G
authors.lastname: Erdos
authors.affiliation: c Service de Médecine Nucléaire, Dept. de Radio-Oncologie, Centre des Tumeurs de l'Université Libre de Bruxelles, Inst. J. Bordet, Brussels, Belgium.
authors.forename: J
authors.initials: J
authors.lastname: Fruhling
authors.affiliation: a Dept. Hématologie, Service de Médicine Interne et Laboratoire d'Investigation Clinique H. Tagnon, Brussels, Belgium.
authors.forename: P
authors.initials: P
authors.lastname: Stryckmans
authors.affiliation: b Laboratoire de Cytologie et de Cancérologie Expérimentale, Faculté de Médecine, Université Libre de Bruxelles, Brussels, Belgium.
authors.forename: P
authors.initials: P
authors.lastname: Galand
keywords: Antibody-coated particles; electron microscopy; iron particles; leukemic cells