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Viral Nanoparticles for In vivo Tumor Imaging
Published on: November 16, 2012
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Engineered protein nanoparticles for in vivo tumor detection
Keum-Young Ahn1, Ho Kyung Ko2, Bo-Ram Lee1
1Department of Chemical and Biological Engineering, Korea University, Anam-Dong 5-1, Seongbuk-Gu, Seoul 136-713, Republic of Korea.
Biomaterials
|May 10, 2014
Summary
Engineered protein nanoparticles, Escherichia coli DNA-binding protein (eDPS) and Thermoplasma acidophilum proteasome (tPTS), show promise for in vivo optical tumor detection by targeting integrin-expressing cells and enhancing tumor imaging. The tPTS nanoparticles demonstrated superior tumor imaging due to their longer in vivo circulation.
Area of Science:
- Biotechnology
- Nanomedicine
- Optical Imaging
Background:
- Protein nanoparticles offer versatile platforms for biomedical applications.
- Targeting specific cell surface receptors, like integrins, is crucial for effective tumor-specific delivery.
- Near-infrared (NIR) fluorescence imaging enables sensitive detection of biological processes in vivo.
Purpose of the Study:
- To engineer and evaluate two distinct protein nanoparticles for in vivo optical tumor detection.
- To assess the impact of nanoparticle shape and surface structure on tumor targeting and imaging efficacy.
- To investigate the role of RGD peptide functionalization in enhancing tumor cell uptake and retention.
Main Methods:
- Genetic insertion of arginine-glycine-aspartic acid (RGD) peptide onto Escherichia coli DNA-binding protein (eDPS) and Thermoplasma acidophilum proteasome (tPTS) nanoparticles.
- Chemical conjugation of NIR fluorescence dye to surface lysine residues of the engineered nanoparticles.
- In vitro assessment of cell viability and damage.
- In vivo evaluation of nanoparticle biodistribution, tumor accumulation, and fluorescence imaging in tumor-bearing mice.
Main Results:
- Engineered eDPS and tPTS nanoparticles successfully targeted integrin-expressing tumor cells without causing adverse effects.
- Both nanoparticle types accumulated in tumors with minimal renal clearance.
- RGD functionalization led to prolonged retention in tumors and enhanced fluorescence intensity.
- tPTS nanoparticles exhibited more intense tumor fluorescence compared to eDPS, attributed to their longer in vivo half-life.
Conclusions:
- Protein nanoparticles, functionalized with RGD peptides and NIR dyes, are effective for in vivo optical tumor detection.
- Nanoparticle characteristics, such as origin and structure, influence their in vivo performance.
- This study demonstrates the potential of diverse protein nanoparticles for advanced tumor imaging applications.
