Journal
JOURNAL OF CONTROLLED RELEASE
Volume 269, Issue -, Pages 347-354Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jconrel.2017.11.035
Keywords
Micro-injections; Hollow microneedles; Intradermal vaccination; Liposomes; Therapeutic cancer vaccine
Funding
- Translational Drug Discovery and Development (TDDD) profiling area of University Leiden, The Netherlands
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Recent studies have shown that intradermal vaccination has great potential for T cell-mediated cancer immunotherapy. However, classical intradermal immunization with a hypodermic needle and syringe has several drawbacks. Therefore, in the present study a digitally controlled hollow microneedle injection system (DC-hMN-iSystem) with an ultra-low dead volume was developed to perform micro-injections (0.25-10 mu L) into skin in an automated manner. A synthetic long peptide derived from human papilloma virus formulated in cationic liposomes, which was used as a therapeutic cancer vaccine, was administered intradermally by using the DC-hMN-iSystem. Fused silica hollow microneedles with an inner diameter of 50 mu m and a bevel length of 66 +/- 26 mu m were successfully fabricated via hydrofluoric acid etching. Upon piercing these microneedles into the skin using a protrusion length of 400 mu m, microneedles were inserted at a depth of 350 +/- 55 mu m. Micro-injections of 1-10 mu L had an accuracy between 97 and 113% with a relative standard deviation (RSD) of 9%, and lower volumes (0.25 and 0.5 mu L) had an accuracy of 86-103% with a RSD of 29% in ex vivo human skin. Intradermal administration of the therapeutic cancer vaccine via micro-injections induced strong functional cytotoxic and T-(h)elper responses in mice, while requiring much lower volumes as compared to classical intradermal immunization. In conclusion, by using the newly developed DC-hMN-iSystem, very low vaccine volumes can be precisely injected into skin in an automated manner. Thereby, this system shows potential for minimally-invasive and potentially pain-free therapeutic cancer vaccination.
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