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Macromol Biosci. 2018 Nov 8:e1800301. doi: 10.1002/mabi.201800301. [Epub ahead of print]

Efficient Delivery of Tyrosinase Related Protein-2 (TRP2) Peptides to Lymph Nodes using Serum-Derived Exosomes.

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Department of Bioscience and Biotechnology, Konkuk University, Seoul, 05029, Republic of Korea.


Exosomes (EXO) are considered to be versatile carriers for biomolecules; however, the delivery of therapeutic peptides using EXOs poses several challenges. In this study, the efficiency of serum-derived EXOs in delivering tyrosinase-related protein-2 (TRP2) peptides to lymph nodes is determined. TRP2 peptides are successfully incorporated into EXOs, which show a uniform and narrow size distribution of around 45 nm. The TRP2-incorporated exosomes (EXO-TRP2) are efficiently internalized into macrophages and dendritic cells, and are seen to display a punctate distribution. EXOs loaded with TRP2 together with MPLA, (EXO-MPLA-TRP2) result in a strong release of proinflammatory cytokines (TNF-α and IL-6) from both RAW264.7 and DC2.4 cells. Finally, subcutaneous injection of fluorescently labeled EXO-TRP2 followed by ex vivo imaging using in vivo imaging system (IVIS) show a strong fluorescent signal in the lymph nodes after only 1 h, which is maintained until at least 4 h after injection. Taken together, the findings suggest that serum-derived EXOs can serve as promising carriers to deliver therapeutic peptides to lymph nodes for immunotherapy.


cytokine; dendritic cell; exosome; lymph node; tyrosinase-related protein-2 peptide


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