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Synthesis of Cationized Magnetoferritin for Ultra-fast Magnetization of Cells
Published on: December 13, 2016
Iron-based ferritin nanocore as a contrast agent.
Barindra Sana1, Eric Johnson, Kenneth Sheah
1Division of Bioengineering, School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore 637457.
Biointerphases
|December 22, 2010
Summary
Engineered ferritin protein cages loaded with iron nanoparticles show promise as magnetic resonance imaging contrast agents. These iron-loaded ferritin nanoparticles effectively enhance MRI signals, particularly for T2 imaging.
Area of Science:
- Biomaterials Science
- Nanotechnology
- Biophysics
Background:
- Protein cages, like ferritin, are naturally occurring structures that can encapsulate molecules.
- Ferritin's ability to store iron intracellularly makes it a candidate for biomimetic nanoparticle synthesis.
- Engineered ferritin variants offer tunable properties for specific applications.
Purpose of the Study:
- To investigate iron-loaded engineered ferritin (AfFtn-AA) as a potential magnetic resonance (MR) imaging contrast agent.
- To characterize the self-assembly and magnetic properties of these iron-loaded nanoparticles.
- To evaluate their performance in MR imaging.
Main Methods:
- Dynamic light scattering and size exclusion chromatography for self-assembly analysis.
- Transmission electron microscopy for nanoparticle size distribution.
- Vibrating sample magnetometry for magnetic properties.
- 3.0 T whole-body MRI scanning to assess contrast enhancement.
Main Results:
- AfFtn-AA demonstrated homogeneous size distribution upon self-assembly.
- Iron-loaded AfFtn-AA exhibited significant T1 brightening and T2 signal loss in MR images.
- Extremely high R2 relaxivity values (5300 mM⁻¹s⁻¹) were measured, confirming strong T2 contrast effects.
Conclusions:
- Engineered ferritin nanoparticles loaded with iron are effective MR imaging contrast agents.
- Their performance, particularly as T2 contrast agents, is concentration-dependent.
- AfFtn-AA holds significant potential for advanced diagnostic imaging applications.
