Journal
JOURNAL OF CONTROLLED RELEASE
Volume 255, Issue -, Pages 81-93Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jconrel.2017.04.011
Keywords
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Funding
- National Natural Science Foundation of China [51622307, 21574127, 51233004, 51390484]
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In situ-forming thermosensitive hydrogels based on poly(ethylene glycol)-poly(gamma-ethyl-L-glutamate) diblock copolymers (mPEG-b-PELG) were prepared for the co-delivery of interleukin-15 (IL-15) and cisplatin (CDDP). The polypeptide-based hydrogels as local drug delivery carriers could reduce the systemic toxicity, degrade thoroughly within 3 weeks after subcutaneous injection into rats and display an acceptable biocompatibility. When incubated with mouse melanoma B16 cells, only the CDDP-treated groups had significant effects on the S phase cell-cycle arrest in melanoma cells. After a single peritumoral injection of the hydrogel containing IL-15/CDDP in C57BL/6 mice inoculated with B16F0-RFP melanoma cells, the dual drug-loaded hydrogels displayed synergistic anticancer efficacy, which was resulted from a combination of CDDP-mediated S arrest and IL-15/CDDP-induced recovery of CD8(+) T cell and NK cell populations to reduce immunosuppression and enhance antitumor immunity. Hence, the as-prepared thermosensitive polypeptide hydrogels for localized and sustained co-delivery of IL-15 and CDDP may have potential for efficient treatment of melanoma.
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