19:10 - 21:00
Room: Ishikawa Ongakudō Interchange Hall
Poster Session
Virus-like particle (VLP) mediated Tfh differentiation and antibody responses
YOUN SOO CHOI1, 2, 4, Yun-Hui Jeon1, Yoo-Rha Kang1, Vladimir Temchura3, Klaus Uberla3, Shane Crotty4
1Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, Korea, Republic of (South), 2Department of Medicine, Seoul National University College of Medicine, Seoul, Korea, Republic of (South), 3Institute of Virology, University of Erlangen, Erlangen, Germany, 44Division of Vaccine Discovery, La Jolla Institute for Allergy and Immunology, La Jolla, United States

High affinity antibodies (Abs) for target antigens (Ags) on pathogens are critical components of vaccines. Long-lived plasma cells and memory B cells, effector B cells that are responsible for production of high affinity Abs, develop predominantly from germinal centers. Follicular helper T (Tfh) cells provide help B cells to form germinal centers. Therefore, for development of efficacious vaccines, it is critical to understand how to regulate Tfh cell differentiation and functions and which Ags to choose among proteins that are present on pathogens as a target for high affinity Abs. We produced virus-like particles (VLPs) that express hemagglutinin (HA) of influenza A virus (IAV) A/PR/8/1934 (H1N1) and OTII peptide (OVA323-339) to analyze B and T cell responses in Ag-specific manners. To elicit Ab responses to the stalk region of A/PR/8/1934, where genetic information has been relatively conserved among heterologous H1N1 IAV, VLPs were engineered to express HA (headless HA, HD’less HA), whose globular head region was removed. Upon immunization of VLPs adjuvanted with Addavax, Abs were strongly induced against A/PR/8/1934 HA with concomitant induction of Tfh differentiation of OTII cells. Moreover, in contrast to NR4542, a mouse monoclonal Ab developed against globular head region of A/PR/8/1934, which exhibits mono-specificity for A/PR/8/1934 HA, Abs produced by VLP immunization were capable to bind to HA of heterologous H1N1 IAV, in addition to one of A/PR/8/1934. Collectively, our data suggest VLP immunization system could serve for a valuable system to develop efficacious vaccines.


Reference:
Tu-P12-8
Session:
Poster Session 12 “Helper T cell differentiation”
Presenter/s:
YOUN SOO CHOI
Presentation type:
Poster Presentation
Room:
Ishikawa Ongakudō Interchange Hall
Date:
Tuesday, 31 October 2017
Time:
19:10 - 21:00
Session times:
19:10 - 21:00