Oral PLGA-based DNA vaccines using interferons as adjuvants remarkably promote the immune protection of grass carp(Ctenopharyngodon idella)against GCRV infection  

作　　者：Chaolin Jiang Xingchen Huo Lingjie Tang Meidi Hu Chunrong Yang Daji Luo Jianguo Su 

机构地区：[1]Hubei Hongshan Laboratory,College of Fisheries,Huazhong Agricultural University,Wuhan,430070,China [2]Laboratory for Marine Biology and Biotechnology,Pilot National Laboratory for Marine Science and Technology,Qingdao,266237,China [3]Engineering Research Center of Green Development for Conventional Aquatic Biological Industry in the Yangtze River Economic Belt,Ministry of Education,Wuhan,430070,China [4]College of Veterinary Medicine,Huazhong Agricultural University,Wuhan,430070,China [5]Institute of Hydrobiology,Chinese Academy of Sciences,Wuhan,430072,China

出　　处：《Water Biology and Security》2023年第2期91-101,共11页水生生物与安全（英文）

基　　金：supported by the National Key R&D Program of China(2022YFF1000302);Major Project of Hubei Hongshan Laboratory(2022hszd011).

摘　　要：Grass carp hemorrhagic disease caused by grass carp reovirus(GCRV)results in significant economic losses to the global grass carp aquaculture industry.Oral vaccination is an ideal choice for disease precaution in aquaculture.However,oral vaccine can be degraded in the gut.Therefore,the selection of loading materials is essential.In this study,the S6 and S7 fragments(encoding the outer capsid protein VP4 and fibronectin VP56 of GCRV)and grass carp interferons(IFNs),including IFN1,IFN3,and IFNγ2 were used to create DNA vaccines and adjuvants based on pcDNA3.1,respectively.The oral DNA vaccine was encapsulated in poly(lactic-co-glycolic acid)(PLGA)and polyvinyl alcohol(PVA)with IFNs.The PLGA-PVA(PP)nano-microspheres were prepared by double emulsionsolvent evaporation technique.Using transmission electron microscopy and dynamic light scattering assays,it was determined the vaccines had a spherical structure with uniform particle size(643.5±35.3 nm).The nanomicrospheres possessed excellent encapsulation efficiency(81.6±2.6%)and loading rate(0.54±0.02%),and simultaneously exhibited negligible hemolytic activity and cell toxicity.The protection rate and tissue viral loads post-GCRV challenge in grass carp were assessed.The oral PP nano-microsphere with pVP4 t pIFN1(PP41)vaccine increased protection rate by 44%compared with the control group and was correlated with relatively low viral loads in the spleen,head kidney,and hindgut.Further,three crucial serum biochemical indexes,total superoxide dismutase(TSOD),complement C3(C3),and lysozyme(LZM),were also dramatically increased.Furthermore,mRNA expressions of representative immune-related genes(IgM,IFN1,IFNγ2,MHC-I,and CD8α)in the head kidney and spleen were significantly enhanced.In addition,mRNA expression of IgT was significantly boosted in the hindgut.The results indicate that DNA vaccine capsulated with PP is effective against GCRV infection.The present study provides insights into a prospective strategy for oral vaccine development in aquaculture.

关 键 词：Grass carp(Ctenopharyngodon idella) Grass carp reovirus(GCRV) PLGA DNA vaccine INTERFERON ADJUVANT 

分 类 号：S94[农业科学—水产养殖]