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Pharmaceutics 2018, 10(3), 77;

Loading IR820 Using Multifunctional Dendrimers with Enhanced Stability and Specificity

1,2,* and 1,2
Institute for Clean Energy and Advanced Materials, Faculty of Materials and Energy, Southwest University, Chongqing 400715, China
Chongqing Engineering Research Center for Micro-Nano Biomedical Materials and Devices, Chongqing 400715, China
Author to whom correspondence should be addressed.
Received: 13 June 2018 / Revised: 23 June 2018 / Accepted: 24 June 2018 / Published: 28 June 2018
(This article belongs to the Special Issue Dendrimers in Nanomedical Applications: Update and Future Directions)
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Cyanine dyes are promising candidates in biomedical applications. Although various delivery systems have been developed to enhance their properties, their dendrimer-based delivery systems are seldom investigated. Herein, amine-terminated generation 5 poly(amidoamine) (G5.NH2) dendrimers and new indocyanine green (IR820) dyes were chosen as models to study the loading ability of dendrimers for cyanine dynes. G5.NH2 dendrimers were pre-modified with arginine-glycine-aspartic (RGD) peptides, poly(ethylene glycol) chains, and acetyl groups to be endowed with cancer cell specificity and biocompatibility. The formed Ac-PR dendrimers were used to load IR820, followed by thorough characterization. The loaded number of IR820 was estimated to be 6.7 per dendrimer. The stability of IR820 was improved through dendrimer loading, which was proved by their UV-vis spectra under different kinds of storage conditions. In addition, the formed Ac-PR dendrimers can retain the loaded IR820 effectively. Their cytocompatibility was desirable under the studied conditions. Their cellular uptake behaviors were demonstrated to be enhanced by RGD modification, showing concentration-, co-incubation time-, and αvβ3 integrin receptor-dependent properties, displaying a cytoplasm-location. The findings from this work demonstrated the versatile loading and delivery capacity of dendrimers for near-infrared (NIR) dyes, providing fundamental data for the development of dendrimer/NIR dye systems for biomedical applications, especially for cancer theranostic applications. View Full-Text
Keywords: poly(amidoamine) dendrimers; new indocyanine green (IR820); stability; targeted delivery; cancer cells poly(amidoamine) dendrimers; new indocyanine green (IR820); stability; targeted delivery; cancer cells

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Liu, H.; Wang, J. Loading IR820 Using Multifunctional Dendrimers with Enhanced Stability and Specificity. Pharmaceutics 2018, 10, 77.

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