Metal−Organic Polyhedron with Four Fe(III) Centers Producing Enhanced T1 Magnetic Resonance Imaging Contrast in TumorsClick to copy article linkArticle link copied!
- Gregory E. SokolowGregory E. SokolowDepartment of Chemistry, University at Buffalo the State University of New York, Buffalo, New York 14260, United StatesMore by Gregory E. Sokolow
- Matthew R. CrawleyMatthew R. CrawleyDepartment of Chemistry, University at Buffalo the State University of New York, Buffalo, New York 14260, United StatesMore by Matthew R. Crawley
- Daniel R. MorphetDaniel R. MorphetDepartment of Chemistry, University at Buffalo the State University of New York, Buffalo, New York 14260, United StatesMore by Daniel R. Morphet
- Didar AsikDidar AsikDepartment of Chemistry, University at Buffalo the State University of New York, Buffalo, New York 14260, United StatesMore by Didar Asik
- Joseph A. SpernyakJoseph A. SpernyakDepartment of Cell Stress Biology, Roswell Park Comprehensive Cancer Center, Buffalo, New York 14263, United StatesMore by Joseph A. Spernyak
- A. J. Robert McGrayA. J. Robert McGrayDepartment of Immunology, Roswell Park Comprehensive Cancer Center, Buffalo, New York 14263, United StatesMore by A. J. Robert McGray
- Timothy R. Cook*Timothy R. Cook*Email: [email protected]Department of Chemistry, University at Buffalo the State University of New York, Buffalo, New York 14260, United StatesMore by Timothy R. Cook
- Janet R. Morrow*Janet R. Morrow*Email: [email protected]Department of Chemistry, University at Buffalo the State University of New York, Buffalo, New York 14260, United StatesMore by Janet R. Morrow
Abstract

A metal−organic polyhedron (MOP) with four paramagnetic Fe(III) centers was studied as a magnetic resonance imaging (MRI) probe. The MOP was characterized in solution by using electron paramagnetic resonance (EPR), UV–visible (UV–vis) spectroscopies, Fourier-transform ion cyclotron resonance (FT-ICR) mass spectrometry, and in the solid state with single-crystal X-ray diffraction. Water proton T1 relaxation properties were examined in solution and showed significant enhancement in the presence of human serum albumin (HSA). The r1 relaxivities in the absence and presence of HSA were 8.7 mM–1 s–1 and 21 mM–1 s–1, respectively, per molecule (2.2 mM–1 s–1 and 5.3 mM–1 s–1 per Fe) at 4.7 T, 37 °C. In vivo studies of the iron MOP show strong contrast enhancement of the blood pool even at a low dose of 0.025 mmol/kg with prolonged residence in vasculature and clearance through the intestinal tract of mice. The MOP binds strongly to serum albumin and shows comparable accumulation in a murine tumor model as compared to a covalently linked Gd-HSA contrast agent.
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