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Preparation and In Vitro Characterization of Dendrimer-based Contrast Agents for Magnetic Resonance Imaging
Published on: December 4, 2016
A Gd3Al tetranuclear complex as a potential bimodal MRI/optical imaging agent
Wei-Sheng Li1, Jian Luo, Feng Jiang
1State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China.
Dalton Transactions (Cambridge, England : 2003)
|June 29, 2012
Summary
A novel gadolinium(III)-aluminum(III) complex (Gd(3)Al) shows superior magnetic resonance imaging (MRI) contrast enhancement and bright green luminescence. This bimodal agent is cell-permeable, localizing to the cytoplasm for potential advanced imaging applications.
Area of Science:
- Materials Science
- Biomedical Imaging
- Nanotechnology
Background:
- Gadolinium-based contrast agents are crucial for Magnetic Resonance Imaging (MRI).
- Developing agents with enhanced relaxivity and multimodal imaging capabilities is an active research area.
- Optical imaging offers complementary information to MRI, but requires agents with suitable luminescent properties.
Purpose of the Study:
- To synthesize and characterize a novel self-assembled gadolinium(III)-aluminum(III) complex (Gd(3)Al).
- To evaluate the potential of the Gd(3)Al complex as a bimodal MRI and optical imaging agent.
- To compare the performance of Gd(3)Al with a clinically used MRI contrast agent, Gd-DTPA.
Main Methods:
- Synthesis and characterization of the Gd(3)Al complex.
- Relaxivity measurements at 400 MHz and 25 °C.
- In vitro T(1)-weighted MRI on a 0.5 T magnetic field.
- Spectroscopic analysis to determine luminescence properties (emission spectrum at 510 nm).
- Live-cell fluorescence imaging to assess cellular uptake and localization.
Main Results:
- The Gd(3)Al complex demonstrated significantly higher relaxivity (7.18 mM(-1) s(-1)) compared to Gd-DTPA (3.9 mM(-1) s(-1)).
- In vitro MRI showed enhanced signal contrast with Gd(3)Al compared to Gd-DTPA.
- The Gd(3)Al complex exhibited bright-green luminescence with an emission maximum at 510 nm.
- Live-cell imaging confirmed cell permeability and cytoplasmic localization of the Gd(3)Al complex.
Conclusions:
- The Gd(3)Al complex possesses superior relaxometric properties for MRI.
- The compound exhibits promising luminescent characteristics for optical imaging.
- Gd(3)Al is cell-permeable and localizes within the cytoplasm.
- The Gd(3)Al complex is a potential candidate for bimodal MRI/optical imaging applications.
