Abstract
Aim:
CCL19 and its receptor CCR7 are essential molecules for facilitating the trafficking of mature dendritic cells (DCs) and helping to establish a microenvironment in lymphoid tissues to initiate primary immune responses, whereas CCL17 is required in the CCR7-CCL19-dependent migration of DCs. In this study we examined whether co-administration of CCL17 and CCL19 could enhance the immunogenicity of an anti-caries DNA vaccine, pCIA-P, in rodents.
Methods:
Plasmids encoding CCL17 (pCCL17/VAX) and CCL19 (pCCL19/VAX) were constructed. BALB/c mice were intranasally administered pCCL17/VAX, pCCL19/VAX, or pCCL17/VAX plus pCCL19/VAX, the migration of DCs to the spleen and draining lymph nodes (DLNs) was assessed with flow cytometry. The mice were co-administered pCIA-P; and the anti-PAc antibodies in the serum and saliva were detected with ELISA. Wistar rats were orally challenged with Streptococcus mutans and then administered pCIA-P in combination with pCCL17/VAX, pCCL19/VAX, or pCCL17/VAX plus pCCL19/VAX. The amount of S mutans sustained on rat molar surfaces was assessed using a colony forming assay. Caries activity was scored with the Keyes method.
Results:
Co-administration of the CCL17 and CCL19 genes in mice caused a greater increase in the number of mature DCs in the spleen and DLNs compared with administration of CCL17 or CCL19 genes alone. CCL17 and CCL19 double-adjuvant plus pCIA-P induced significantly higher levels of anti-PAc salivary IgA and anti-PAc serum IgG antibody in mice, and strengthened the ability of pCIA-P in inhibiting the colonization of S mutans on rat tooth surfaces. The caries activity of the combined adjuvant group was significantly lower than that of the pCCL17/VAX or the pCCL19/VAX group.
Conclusion:
A nasal adjuvant consisting of a combination of CCL17 and CCL19 attracts more mature DCs to secondary lymphoid tissues, inducing enhanced antibody responses against the anti-caries DNA vaccine pCIA-P and reducing S mutans infection in rodents.
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Acknowledgements
This study was financially supported by grants from the National Natural Science Foundation of China (No 81570968 and 81271129).
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Yan, Yh., Yu, F., Zeng, C. et al. CCL17 combined with CCL19 as a nasal adjuvant enhances the immunogenicity of an anti-caries DNA vaccine in rodents. Acta Pharmacol Sin 37, 1229–1236 (2016). https://doi.org/10.1038/aps.2016.73
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DOI: https://doi.org/10.1038/aps.2016.73
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