1
|
Abakumova T, Abakumov M, Shein S, Chelushkin P, Bychkov D, Mukhin V, Yusubalieva G, Grinenko N, Kabanov A, Nukolova N, Chekhonin V. Connexin 43-targeted T1 contrast agent for MRI diagnosis of glioma. Contrast Media Mol Imaging 2015; 11:15-23. [PMID: 26265140 DOI: 10.1002/cmmi.1653] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2014] [Revised: 04/13/2015] [Accepted: 05/20/2015] [Indexed: 12/22/2022]
Abstract
Glioblastoma multiforme is the most aggressive form of brain tumor. Early and accurate diagnosis of glioma and its borders is an important step for its successful treatment. One of the promising targets for selective visualization of glioma and its margins is connexin 43 (Cx43), which is highly expressed in reactive astrocytes and migrating glioma cells. The purpose of this study was to synthesize a Gd-based contrast agent conjugated with specific antibodies to Cx43 for efficient visualization of glioma C6 in vivo. We have prepared stable nontoxic conjugates of monoclonal antibody to Cx43 and polylysine-DTPA ligands complexed with Gd(III), which are characterized by higher T1 relaxivity (6.5 mM(-1) s(-1) at 7 T) than the commercial agent Magnevist® (3.4 mM(-1) s(-1)). Cellular uptake of Cx43-specific T1 contrast agent in glioma C6 cells was more than four times higher than the nonspecific IgG-contrast agent, as detected by flow cytometry and confocal analysis. MRI experiments showed that the obtained agents could markedly enhance visualization of glioma C6 in vivo after their intravenous administration. Significant accumulation of Cx43-targeted contrast agents in glioma and the peritumoral zone led not only to enhanced contrast but also to improved detection of the tumor periphery. Fluorescence imaging confirmed notable accumulation of Cx43-specific conjugates in the peritumoral zone compared with nonspecific IgG conjugates at 24 h after intravenous injection. All these features of Cx43-targeted contrast agents might be useful for more precise diagnosis of glioma and its borders by MRI.
Collapse
Affiliation(s)
- Tatiana Abakumova
- Department of Fundamental and Applied Neurobiology, Serbsky National Research Center for Social and Forensic Psychiatry, Moscow, Russia
| | - Maxim Abakumov
- Department of Medical Nanobiotechnology, Pirogov Russian National Research Medical University, Moscow, Russia
| | - Sergey Shein
- Department of Fundamental and Applied Neurobiology, Serbsky National Research Center for Social and Forensic Psychiatry, Moscow, Russia
| | - Pavel Chelushkin
- Laboratory of Synthesis of Peptides and Polymer Microspheres, Institute of Macromolecular Compounds, Russian Academy of Sciences, St Petersburg, Russia
| | - Dmitry Bychkov
- Department of Geology, Lomonosov Moscow State University, Moscow, Russia
| | - Vladimir Mukhin
- Department of Medical Nanobiotechnology, Pirogov Russian National Research Medical University, Moscow, Russia
| | - Gaukhar Yusubalieva
- Department of Fundamental and Applied Neurobiology, Serbsky National Research Center for Social and Forensic Psychiatry, Moscow, Russia
| | - Nadezhda Grinenko
- Department of Fundamental and Applied Neurobiology, Serbsky National Research Center for Social and Forensic Psychiatry, Moscow, Russia
| | - Alexander Kabanov
- Department of Chemistry, Laboratory Chemical Design of Bionanomaterials, Lomonosov Moscow State University, Moscow, Russia.,Center for Nanotechnology in Drug Delivery and Division of Molecular Therapeutics, UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Natalia Nukolova
- Department of Fundamental and Applied Neurobiology, Serbsky National Research Center for Social and Forensic Psychiatry, Moscow, Russia.,Department of Chemistry, Laboratory Chemical Design of Bionanomaterials, Lomonosov Moscow State University, Moscow, Russia
| | - Vladimir Chekhonin
- Department of Fundamental and Applied Neurobiology, Serbsky National Research Center for Social and Forensic Psychiatry, Moscow, Russia.,Department of Medical Nanobiotechnology, Pirogov Russian National Research Medical University, Moscow, Russia
| |
Collapse
|