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Injectable Polymer-Nanoparticle Hydrogels for Local Immune Cell Recruitment

Fenton, Owen S and Tibbitt, Mark W and Appel, Eric A and Jhunjhunwala, Siddharth and Webber, Matthew J and Langer, Robert (2019) Injectable Polymer-Nanoparticle Hydrogels for Local Immune Cell Recruitment. In: BIOMACROMOLECULES, 20 (12). pp. 4430-4436.

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Official URL: https://dx.doi.org/10.1021/acs.biomac.9b01129


The ability to engineer immune function has transformed modern medicine, highlighted by the success of vaccinations and recent efforts in cancer immunotherapy. Further directions in programming the immune system focus on the design of immunomodulatory biomaterials that can recruit, engage with, and program immune cells locally in vivo. Here, we synthesized shear-thinning and self-healing polymer-nanoparticle (PNP) hydrogels as a tunable and injectable biomaterial platform for local dendritic cell (DC) recruitment. PNP gels were formed from two populations of poly(ethylene glycol)-block-polylactide (PEG-b-PLA) NPs with the same diameter but different PEG brush length (2 or 5 kDa). PEG-b-PLA NPs with the longer PEG brush exhibited improved gel formation following self-assembly and faster recovery after shear-thinning. In all cases, model protein therapeutics were released via Fickian diffusion in vitro, and minor differences in the release rate between the gel formulations were observed. PNP hydrogels were loaded with the DC cytokine CCL21 and injected subcutaneously in a murine model. CCL21-loaded PNP hydrogels recruited DCs preferentially to the site of injection in vivo relative to non-CCL21-loaded hydrogels. Thus, PNP hydrogels comprise a simple and tunable platform biomaterial for in vivo immunomodulation following minimally invasive subcutaneous injection.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to AMER CHEMICAL SOC, 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Department/Centre: Division of Interdisciplinary Sciences > Centre for Biosystems Science and Engineering
Date Deposited: 08 Jan 2020 11:16
Last Modified: 08 Jan 2020 11:16
URI: http://eprints.iisc.ac.in/id/eprint/64304

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