Transcriptional profile in afferent lymph cells following vaccination with liposomes incorporating CpG

Melanie R Neeland, Martin J Elhay, David R Powell, Fernando J Rossello, Els N T Meeusen, Michael John de Veer

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Vaccine formulations incorporating innate immune stimulants are highly immunogenic, however the biological signals that originate in the peripheral tissues at the site of injection and are transmitted to the local lymph node to induce immunity remain unclear. By directly cannulating the ovine afferent lymphatic vessels, we have previously shown that it takes 72 hours for mature antigen-loaded dendritic cells and monocytes to appear within afferent lymph following injection of a liposomal formulation containing the TLR ligand CpG. In this present study, we characterise the global transcriptional signatures at this time point in ovine afferent lymph cells as they migrate from the injection site into the lymphatics following vaccination with a liposome antigen formulation incorporating CpG. We show that at 72h post vaccination, liposomes alone induce no changes in gene expression and inflammatory profiles within afferent lymph; however the incorporation of CpG drives interferon, antiviral and cytotoxic gene programs. This study also measures the expression of key genes within individual cell types in afferent lymph. Antiviral gene signatures are most prominent in lymphocytes, which may play a significant and unexpected role in sustaining the immune response to vaccination at the site of injection. These findings provide a comprehensive analysis of the in vivo immunological pathways that connect the injection site with the local draining lymph node following vaccination. This article is protected by copyright. All rights reserved.
Original languageEnglish
Pages (from-to)518-529
Number of pages12
JournalImmunology
Volume144
Issue number3
DOIs
Publication statusPublished - 2015

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