Monoclonal antibodies conjugated with superparamagnetic iron oxide particles allow magnetic resonance imaging detection of lymphocytes in the mouse brain

Alessandro Luchetti, Davide Milani, Francesca Ruffini, Rossella Galli, Andrea Falini, Angelo Quattrini, Giuseppe Scotti, Giancarlo Comi, Gianvito Martino, Roberto Furlan, Letterio S. Politi

Research output: Contribution to journalArticle

Abstract

We investigated the potential of antibody-vectorialized superparamagnetic iron oxide (SPIO) particles as cellular specific magnetic resonance contrast agents to image lymphocyte populations within the central nervous system (CNS), with the final goal of obtaining a reliable tool for noninvasively detecting and tracking specific cellular populations in vivo. We used superparamagnetic particles bound to a monoclonal antibody. The particle is the contrast agent, by means of its T 2* relaxation properties; the antibody is the targeting vector, responsible for homing the particle to target a surface antigen. To investigate the efficiency of particle vectorialization by these antibodies, we compared two types of antibody-vectorialized CD3-specific particles in vivo. We successfully employed vectorialized SPIO particles to image B220 + cells in a murine model of B-cell lymphoma. Likewise, we were able to identify CD3 + infiltrates in a murine model of multiple sclerosis. The specificity of the technique was confirmed by immunohistochemistry and electron microscopy of corresponding sections. Our findings suggest that indirect binding of the antibody to a streptavidinated particle allows for enhanced particle vectorialization compared to covalent binding of the antibody to the particle.

Original languageEnglish
Pages (from-to)114-125
Number of pages12
JournalMolecular Imaging
Volume11
Issue number2
DOIs
Publication statusPublished - Mar 2012

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Biotechnology
  • Molecular Medicine
  • Biomedical Engineering
  • Condensed Matter Physics

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