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Virologica Sinica, 32 (4) : 317, 2017
Research Article
Recombinant rabies virus expressing IL-15 enhances immunogenicity through promoting the activation of dendritic cells in mice
1. State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, China
2. Key Laboratory of Preventive Veterinary Medicine of Hubei Province, Huazhong Agricultural University, Wuhan 430070, China
3. Department of Pathology, University of Georgia, Athens, GA 30602, USA
 Correspondence: lingzhao@mail.hzau.edu.cn;mikchail@163.com
Rabies remains a public health threat that kills approximately 59,000 people worldwide each year, most of which are from the developing countries of Africa and Asia where dog rabies are endemic. Therefore,developing an affordable and efficacious vaccine is crucial for rabies control in these countries.Interleukin (IL)-15,an immunoregulatory cytokine,is a pluripotent molecule with therapeutic potential,which targets many cell types and links the innate and adaptive immune system.In this study,IL-15 gene was cloned and inserted into the genome of a recombinant rabies virus (RABV) strain LBNSE (designated as LBNSE-IL15),and the effect of over-expression of IL-15 on the immunogenicity of RABV was investigated.It was found that mice vaccinated with LBNSEIL15 could induce significantly higher level of virus-neutralizing antibody (VNA) than those immunized with LBNSE,resulting in the higher protection after challenge.Further investigation was performed to find out the possible role of IL-15 plays in the process of antibody induction,and it was found that LBNSE-IL15 could enhance the maturation of dendritic cells (DCs) in immunized mice.Furthermore,the mice immunized with LBNSE-IL15 could promote the TFH cells differentiation and the generation of germinal center B cells and plasma cells.Together,these data indicated that IL-15 could be a potential adjuvant in enhancing the immunogenicity of RABV,contributing to the development of more-efficacious rabies vaccines.
Received: 19 Jun 2017  Accepted: 9 Aug 2017  Published online: 29 Aug 2017
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