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Tumor targeted mesoporous silica-coated gold nanorods facilitate detection of pancreatic tumors using Multispectral optoacoustic tomography

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Abstract

Multispectral optoacoustic tomography (MSOT) is an emerging imaging technology that offers several advantages over traditional modalities, particularly in its ability to resolve optical contrast at depth on the microscopic scale. While potential applications include the early detection of tumors below clinical thresholds set by current technology, the lack of tumor-specific contrast agents limits the use of MSOT imaging. Therefore, we constructed highly stable nano-contrast agents by coating gold nanorods (GNRs) with either polyacrylic acid (PAA) or aminefunctionalized mesoporous silica (MS). Syndecan-1, which has been shown to target insulin-like growth factor 1 receptor (IGF1-R) (upregulated in pancreatic tumors), was conjugated on the surface of PAA-coated GNRs (PAA-GNRs) or MS-coated GNRs (MS-GNRs) to create tumor-targeted nanoparticles. In vitro, tumor targeting of nanoparticles was assessed with flow cytometry. In S2VP10L cells (positive for IGF1-R), the syndecan-1 MS-GNRs (Syndecan-MS-GNRs) demonstrated an increase in OA signal, 10x, compared to syndecan-1 PAAGNRs (Syndecan-PAA-GNRs). Minimal binding was observed in MiaPaca-2 cells (negative for IGF1-R). In vivo, tumor specific targeting of Syndecan-MS-GNRs was evaluated using a murine orthotopic pancreatic cancer model. The Syndecan- MS-GNRs demonstrated significantly greater accumulation within pancreatic tumors than in off-target organs such as the liver. Mice implanted with the IGF1-R negative MiaPaca-2 cells did not demonstrate specific tumor targeting. In summary, we report that targeted nano-contrast agents (Syndecan-MS-GNRs) can successfully detect orthotopic pancreatic tumors with minimum off-target binding in vivo using MSOT.

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Authors and Affiliations

  1. Department of Medicine, University of Louisville, Louisville, KY, 40202, USA

    Anil Khanal, Christopher Ullum, Nichola C. Garbett, Joseph A. Burlison, Molly W. McNally, Phillip Chuong & Lacey R. McNally

  2. Department of Surgery, University of Louisville, Louisville, KY, 40292, USA

    Charles W. Kimbrough

  3. Speed School of Engineering, University of Louisville, Louisville, KY, 40292, USA

    Ayman S. El-Baz & Jacek B. Jasinski

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  1. Anil Khanal
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Correspondence to Lacey R. McNally.

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Khanal, A., Ullum, C., Kimbrough, C.W. et al. Tumor targeted mesoporous silica-coated gold nanorods facilitate detection of pancreatic tumors using Multispectral optoacoustic tomography. Nano Res. 8, 3864–3877 (2015). https://doi.org/10.1007/s12274-015-0886-8

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