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Published on: April 28, 2015
Biodegradable polysilsesquioxane nanoparticles as efficient contrast agents for magnetic resonance imaging
Juan L Vivero-Escoto1, William J Rieter, Honam Lau
1Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599, USA.
Small (Weinheim an Der Bergstrasse, Germany)
|April 25, 2013
Summary
Biodegradable polysilsesquioxane (PSQ) nanoparticles carrying high payloads of gadolinium (Gd-DTPA) were synthesized for magnetic resonance imaging (MRI). These novel nanoparticles demonstrate efficient degradation and excellent performance as MRI contrast agents.
Area of Science:
- Nanomaterials Science
- Biomedical Engineering
- Radiology
Background:
- Polysilsesquioxane (PSQ) nanoparticles offer a versatile platform for creating advanced nanomaterials.
- Developing efficient contrast agents for magnetic resonance imaging (MRI) is crucial for medical diagnostics.
Purpose of the Study:
- To design and synthesize biodegradable PSQ nanoparticles with high concentrations of paramagnetic Gd(III) centers.
- To evaluate these nanoparticles as contrast agents for MRI applications.
Main Methods:
- Synthesis of novel Gd(III) diethylenetriamine pentaacetate (Gd-DTPA) derivatives with disulfide linkages.
- Formation of biodegradable Gd-PSQ particles via base-catalyzed condensation in reverse microemulsions.
- Surface modification of PSQ-2 particles with polyethylene glycol (PEG) and anisamide (AA) ligand.
Main Results:
- Synthesized Gd-PSQ particles (PSQ-1 and PSQ-2) achieved high Gd-DTPA payloads (53.8 wt% and 49.3 wt%).
- Particles showed facile degradation in the presence of reducing agents like cysteine and glutathione.
- Demonstrated high MR relaxivities (r1 values from 5.9 to 17.8 mMs(-1) per Gd) and effective T1-weighted contrast enhancement in vitro.
Conclusions:
- Biodegradable Gd-PSQ nanoparticles represent a promising new class of MRI contrast agents.
- Surface modification enhanced biocompatibility and cell uptake, improving contrast agent efficiency.
- These nanoparticles show potential for sensitive in vitro cancer cell imaging.
