Abstract
Purpose
Simple and noninvasive vaccine administration alternatives to injections are desired. A solid-in-oil (S/O) nanodispersion system was able to overcome skin barriers and induce an immune response; however, antibody levels remained low. We applied an immune potentiator, CpG oligodeoxynucleotide (ODN), to enhance the immune response by controlling the T helper 1 (Th1)/T helper 2 (Th2) balance.
Methods
S/O nanodispersions containing ovalbumin (OVA) and CpG ODN (CpG-A or CpG-B) were characterized by size distribution analysis and a protein release test. The skin permeation of fluorescence-labeled OVA was observed by fluorescence microscopy. Antigen-specific IgG, IgG1, and IgG2a responses were measured by enzyme-linked immunosorbent assay.
Results
Co-encapsulation of CpG ODNs in S/O nanodispersions enhanced induction of OVA-specific IgG. S/O nanodispersion containing OVA and CpG-A had a smaller mean particle size and permeated the skin more efficiently. In contrast, CpG-B showed the highest protein release and induction of OVA-specific IgG. IgG subclass analysis revealed that OVA induced a Th2-dominant immune response, while the S/O nanodispersion containing CpG-A skewed the immune response toward a Th1-bias.
Conclusions
In combination with CpG ODN, the S/O nanodispersion system efficiently induced an antigen-specific antibody response. The Th1/Th2 immune balance could be controlled by the selection of CpG ODN type.
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Abbreviations
- BCA:
-
Bicinchoninic acid
- BSA:
-
Bovine serum albumin
- DC:
-
Dendritic cell
- ELISA:
-
Enzyme-linked immunosorbent assay
- IFN:
-
Interferon
- IPM:
-
Isopropyl myristate
- L-195:
-
Sucrose laurate surfactant
- LC:
-
Langerhans cell
- OD:
-
Optical density
- ODN:
-
Oligodeoxynucleotide
- OVA:
-
Ovalbumin
- PBS:
-
Phosphate-buffered saline
- SC:
-
Stratum corneum
- S/O:
-
Solid-in-oil
- Th:
-
T helper
- Th1:
-
T helper type 1
- Th2:
-
T helper type 2
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Acknowledgments and Disclosures
This work was financed by a Grant-in-Aid for Scientific Research (S) 24226019 from the Ministry of Education, Culture, Sports, Science, and Technology of Japan (to M. G.). We thank Professor Yoshiki Katayama for animal experiments.
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Kitaoka, M., Naritomi, A., Hirakawa, Y. et al. Transdermal Immunization using Solid-in-oil Nanodispersion with CpG Oligodeoxynucleotide Adjuvants. Pharm Res 32, 1486–1492 (2015). https://doi.org/10.1007/s11095-014-1554-5
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DOI: https://doi.org/10.1007/s11095-014-1554-5