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Targeting tumor angiogenic vasculature using polymer-RGD conjugates
Amitava Mitra1, Justin Mulholland, Anjan Nan
1Department of Pharmaceutical Sciences, University of Maryland, Baltimore, MD 21201, USA.
Summary
New imaging agents target tumor blood vessels. A technetium-99m labeled N-(2-hydroxypropyl) methacrylamide (HPMA) copolymer with Arg-Gly-Asp motifs specifically targets tumor angiogenesis, showing enhanced tumor localization and retention in mice.
Area of Science:
- Biomedical imaging
- Nanotechnology
- Oncology
Background:
- Neovascular angiogenesis is crucial for tumor growth and a key target for cancer therapies.
- Targeted delivery systems are needed to improve the efficacy of diagnostic and therapeutic agents for solid tumors.
Purpose of the Study:
- To synthesize, characterize, and evaluate a novel technetium-99m labeled HPMA copolymer-RGD4C conjugate for targeting tumor neovascularization.
- To assess the in vitro and in vivo performance of the HPMA copolymer-RGD4C conjugate in targeting alphaVbeta3 integrins expressed on angiogenic endothelial cells.
Main Methods:
- Synthesis and characterization of HPMA copolymer-RGD4C conjugate and control HPMA copolymer-RGE4C conjugate.
- In vitro endothelial cell adhesion assays to evaluate alphaVbeta3 integrin-mediated cell binding.
- In vivo scintigraphic imaging and biodistribution studies in prostate tumor-bearing SCID mice after intravenous injection.
Main Results:
- HPMA copolymer-RGD4C conjugates effectively inhibited alphaVbeta3-mediated endothelial cell adhesion in vitro.
- In vivo imaging demonstrated significantly greater tumor localization of HPMA copolymer-RGD4C conjugate compared to controls.
- The conjugate showed sustained tumor retention for up to 72 hours with efficient clearance from background organs.
Conclusions:
- HPMA copolymer-RGD4C conjugates enable specific targeting of tumor angiogenesis.
- This construct serves as a promising platform for targeted delivery of diagnostic and therapeutic agents to solid tumors.