CCL19 (ELC) improves TH1-polarized immune responses and protective immunity in a murine Her2/neu DNA vaccination model

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Item Type:	Article
Title:	CCL19 (ELC) improves TH1-polarized immune responses and protective immunity in a murine Her2/neu DNA vaccination model
Creators Name:	Nguyen-Hoai, T., Baldenhofer, G., Ahmed, M.S., Pham-Duc, M., Gries, M., Lipp, M., Doerken, B., Pezzutto, A. and Westermann, J.
Abstract:	BACKGROUND: DNA vaccination is an attractive approach for tumor vaccination since plasmid DNA can be used as a "general vaccine" across MHC barriers. Coexpression of immunomodulatory molecules can help to amplify the immunogenicity of DNA vaccines. CCL19 (ELC) is a CC chemokine with immunoregulatory properties, binding to the chemokine receptor CCR7 which is expressed on dendritic cells (DC) and T cells. In vivo, CCL19 is a key regulator for the interactions between DC and T cells in regional lymph nodes. METHODS: Plasmid DNA (pDNA) encoding Her2/neu and CCL19 was used as an intramuscular vaccine. Vaccination was performed in BALB/c mice which were subsequently challenged with syngeneic Her2/neu + tumor cells. Groups of mice were immunized with pDNA(Her2/neu) plus pDNA(CCL19), pDNA(Her2/neu) plus pDNA(CCL19) plus pDNA(GM-CSF), pDNA(Her2/neu) plus pDNA(GM-CSF), pDNA(Her2/neu), pDNA(CCL19), pDNA(GM-CSF) or mock vector. Tumor protection by the vaccine and immune responses were monitored. RESULTS: Coadministration of pDNA(Her2/neu) and pDNA(CCL19) led to substantial improvement of tumor protection by the vaccine and induced a TH1-polarized, Her2/neu-specific immune response. 47 days after the tumor challenge, 58% of the mice coinjected with pDNA (Her2/neu) and pDNA(CCL19) remained tumor-free as compared with 22% after vaccination with pDNA(Her2/neu) alone. Additional administration of pDNA(GM-CSF) led to further improvement of tumor protection and an amplification of Her2/neu-specific immune responses. CONCLUSIONS: CCL19 is able to induce a TH-1 polarization of the anti Her2/neu immune response which can be further amplified by GM-CSF. Clinical use of a pDNA(Her2/neu-CCL19 ± GM-CSF) vaccine might be promising in Her2/neu + breast cancer in the clinical situation of minimal residual disease.
Keywords:	CCL19, ELC, Chemokines, Her2/neu, DNA Vaccination, Animals, Mice
Source:	Journal of Gene Medicine
ISSN:	1099-498X
Publisher:	John Wiley & Sons
Volume:	14
Number:	2
Page Range:	128-137
Date:	February 2012
Official Publication:	https://doi.org/10.1002/jgm.1651
PubMed:	View item in PubMed

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