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Updated: May 18, 2026
Monitoring of Nanodrug Accumulation in Murine Breast Cancer Metastases
Published on: August 23, 2024
Imaging metastasis using an integrin-targeting chain-shaped nanoparticle
Pubudu M Peiris1, Randall Toy, Elizabeth Doolittle
1Department of Biomedical Engineering, Case Western Reserve University, Cleveland, Ohio, USA.
Abstract:
While the enhanced permeability and retention effect may promote the preferential accumulation of nanoparticles into well-vascularized primary tumors, it is ineffective in the case of metastases hidden within a large population of normal cells. Due to their small size, high dispersion to organs, and low vascularization, metastatic tumors are less accessible to targeted nanoparticles. To tackle these challenges, we designed a nanoparticle for vascular targeting based on an α(v)β(3) integrin-targeted nanochain particle composed of four iron oxide nanospheres chemically linked in a linear assembly. The chain-shaped nanoparticles enabled enhanced "sensing" of the tumor-associated remodeling of the vascular bed, offering increased likelihood of specific recognition of metastatic tumors. Compared to spherical nanoparticles, the chain-shaped nanoparticles resulted in superior targeting of α(v)β(3) integrin due to geometrically enhanced multivalent docking. We performed multimodal in vivo imaging (fluorescence molecular tomography and magnetic resonance imaging) in a non-invasive and quantitative manner, which showed that the nanoparticles targeted metastases in the liver and lungs with high specificity in a highly aggressive breast tumor model in mice.
Insights
Chain-shaped nanoparticles overcome limitations of traditional nanoparticles for targeting hidden metastases. These novel nanochains demonstrate superior accumulation in metastatic tumors, improving cancer detection and treatment strategies.
Area of Science:
- Biomedical Engineering
- Nanotechnology
- Oncology
Background:
- The enhanced permeability and retention (EPR) effect aids nanoparticle accumulation in primary tumors but is limited for detecting metastases.
- Metastatic tumors are challenging to target due to small size, organ dispersion, and poor vascularization, hindering nanoparticle accessibility.
Purpose of the Study:
- To design and evaluate a novel nanoparticle for effective vascular targeting of metastatic tumors.
- To investigate the potential of chain-shaped nanoparticles for enhanced recognition of tumor vasculature.
Main Methods:
- Development of an alpha(v)beta(3) integrin-targeted nanochain particle using four linearly assembled iron oxide nanospheres.
- Utilized multimodal in vivo imaging, including fluorescence molecular tomography and magnetic resonance imaging, for non-invasive and quantitative assessment.
- Compared the targeting efficiency of chain-shaped nanoparticles against spherical nanoparticles in a mouse model.
Main Results:
- Chain-shaped nanoparticles exhibited geometrically enhanced multivalent docking, leading to superior targeting of alpha(v)beta(3) integrin compared to spherical nanoparticles.
- Demonstrated high specificity and accumulation of nanochains in liver and lung metastases.
- The nanochain design enabled enhanced sensing of tumor-associated vascular remodeling.
Conclusions:
- Novel chain-shaped nanoparticles offer a promising strategy for overcoming the limitations of traditional nanoparticles in targeting metastatic disease.
- The developed nanochain particles show potential for improved diagnostic and therapeutic applications in oncology, particularly for hard-to-reach metastases.
