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• W1969855752 abstract "Targeted metallic nanoparticles have shown promise as contrast agents for molecular imaging. To obtain molecular specificity, the nanoparticle surface must be appropriately functionalized with probe molecules that will bind to biomarkers of interest. The aim of this study was to develop and characterize a flexible approach to generate molecular imaging agents based on gold nanoparticles conjugated to a diverse range of probe molecules. We present two complementary oligonucleotide-based approaches to develop gold nanoparticle contrast agents which can be functionalized with a variety of biomolecules ranging from small molecules, to peptides, to antibodies. The size, biocompatibility, and protein concentration per nanoparticle are characterized for the two oligonucleotide-based approaches; the results are compared to contrast agents prepared using adsorption of proteins on gold nanoparticles by electrostatic interaction. Contrast agents prepared from oligonucleotide-functionalized nanoparticles are significantly smaller in size and more stable than contrast agents prepared by adsorption of proteins on gold nanoparticles. We demonstrate the flexibility of the oligonucleotide-based approach by preparing contrast agents conjugated to folate, EGF peptide, and anti-EGFR antibodies. Reflectance images of cancer cell lines labeled with functionalized contrast agents show significantly increased image contrast which is specific for the target biomarker. To demonstrate the modularity of this new bioconjugation approach, we use it to conjugate both fluorophore and anti-EGFR antibodies to metal nanoparticles, yielding a contrast agent which can be probed with multiple imaging modalities. This novel bioconjugation approach can be used to prepare contrast agents targeted with biomolecules that span a diverse range of sizes; at the same time, the bioconjugation method can be adapted to develop multimodal contrast agents for molecular imaging without changing the coating design or material." @default.
• W1969855752 created "2016-06-24" @default.
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• W1969855752 date "2007-10-09" @default.
• W1969855752 modified "2023-10-08" @default.
• W1969855752 title "Oligonucleotide-Coated Metallic Nanoparticles as a Flexible Platform for Molecular Imaging Agents" @default.
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• W1969855752 doi "https://doi.org/10.1021/bc0701242" @default.
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