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Preparation and In Vitro Characterization of Dendrimer-based Contrast Agents for Magnetic Resonance Imaging
Published on: December 4, 2016
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Methemoglobin-Encapsulating Liposome: A Low-Risk Intravascular Contrast Agent for Magnetic Resonance Imaging.
Kazuaki Taguchi1, Akira Sumiyoshi2, Yuto Suzuki1
1Division of Pharmacodynamics, Keio University Faculty of Pharmacy, 1-5-30 Shibakoen, Minato-ku, Tokyo 105-8512, Japan.
ACS Applied Bio Materials
|April 7, 2025
Summary
Researchers developed methemoglobin-encapsulated liposomes (Met-HbVs) as novel MRI contrast agents. Met-HbVs show promise for vascular imaging and angiography, offering a safer alternative to gadolinium-based agents, particularly for patients with kidney issues.
Area of Science:
- Biomaterials Science
- Medical Imaging
- Nanotechnology
Background:
- Magnetic Resonance Imaging (MRI) contrast agents are crucial for visualizing biological tissues.
- Current agents like gadolinium-based contrast agents pose risks, especially for patients with renal impairment.
- Hemoglobin's magnetic properties vary with iron and oxygenation states, influencing MRI contrast.
Purpose of the Study:
- To synthesize and evaluate methemoglobin-encapsulated liposomes (Met-HbVs) as novel MRI contrast agents.
- To investigate the relaxivity properties and vascular imaging capabilities of Met-HbVs.
- To assess the safety profile of Met-HbVs in a preclinical model.
Main Methods:
- Synthesis of methemoglobin-encapsulated liposomes (Met-HbVs) with a size of approximately 200 nm.
- In vitro measurement of longitudinal (r1) and transverse (r2) relaxivity.
- Evaluation of Met-HbV performance in T1-weighted MRI and angiography in mice.
- Assessment of biological responses following Met-HbV administration in mice with chronic renal failure.
Main Results:
- Met-HbVs demonstrated a 2.44-fold increase in longitudinal relaxivity (r1) compared to hemoglobin-encapsulated liposomes.
- Transverse relaxivity (r2) of Met-HbVs was comparable to hemoglobin-encapsulated liposomes.
- Met-HbV administration enhanced signal intensity in T1-weighted images and angiography, particularly in venous structures.
- No significant adverse biological effects were observed in mice with chronic renal failure after Met-HbV administration.
Conclusions:
- Methemoglobin-encapsulated liposomes (Met-HbVs) exhibit potential as effective vascular MRI contrast agents.
- Met-HbVs offer improved safety compared to gadolinium-based agents for patients with renal failure.
- This study presents the first evidence of methemoglobin's utility as a biomaterial for MRI contrast agents.
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