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Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging
Published on: July 21, 2011
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Enzyme-responsive macrocyclic metal complexes for biomedical imaging
Quoc-Viet Le1, Jaiwoo Lee2, Seungbeom Ko2
1Faculty of Pharmacy Ton Duc Thang University Ho Chi Minh City Vietnam.
Bioengineering & Translational Medicine
|September 11, 2023
Summary
This study introduces a novel enzyme-responsive gadolinium (Gd) delivery system for enhanced cancer imaging. The system improves MRI contrast agent safety and tumor specificity, showing promise for theranostic applications.
Area of Science:
- Biomedical Engineering
- Nanotechnology
- Radiochemistry
Background:
- Metal chelator contrast agents are crucial for cancer diagnosis via MRI.
- Current agents require high doses due to rapid clearance and non-specific accumulation, posing safety concerns.
Purpose of the Study:
- To develop an enzyme-responsive metal delivery system for targeted gadolinium (Gd) uptake in tumors.
- To enhance the safety and specificity of MRI contrast agents.
Main Methods:
- A gadolinium-loaded enzyme-responsive macrocyclam (Gd@ErMC) was engineered with a PEGylated, enzyme-cleavable peptide.
- In vivo studies in tumor-bearing mice utilized MRI and positron emission tomography (PET) for distribution analysis.
- Histological and serological analyses were performed to assess safety.
Main Results:
- Gd@ErMC demonstrated an extended half-life and high tumor specificity.
- The PEGylated shell protected against non-specific binding, while enzyme cleavage at the tumor site selectively released Gd.
- Safety assessments confirmed the agent's low toxicity.
Conclusions:
- The novel enzyme-responsive contrast agent delivery system enhances tumor targeting and safety.
- This system shows potential as a theranostic agent for MR-guided radiotherapy.
