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Meng F, Li Q, Han R, Xu G, Gao X, Luo F, Shen G, Liu X, Zhang Z, Zhao P, Zhang G. A study on the infection status and transmission of avian leukosis virus subgroup J in Hy-line brown roosters. Arch Virol 2022; 167:1521-1527. [PMID: 35606465 DOI: 10.1007/s00705-022-05452-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Accepted: 03/19/2022] [Indexed: 11/28/2022]
Abstract
Avian leukosis virus subgroup J (ALV-J) is the most prevalent subgroup in chickens and exhibits increased pathogenicity and stronger horizontal and vertical transmission ability among different breeds. Although vertical transmission of ALV-J from infected hens through artificial insemination has been inferred from the detection of the p27 antigen in swabs and serum, there has been no further research on the transmission pattern of ALVs in roosters. In the present study, the positive rate of ALV increased significantly in an indigenous flock after detecting the p27 antigen via enzyme-linked immunosorbent assay (ELISA) and virus isolation in DF-1 cells. Viral sequence comparisons and an indirect fluorescent antibody assay showed that these isolates belonged to the ALV-J subgroup but formed a new branch in a phylogenetic tree when compared to domestic and foreign referential strains. The gp85 gene of the ALV-J isolated from hens and albumen was 94.1-99.7% identical to that in roosters, revealing that these isolates were quite likely transmitted to the hens and their offspring through the semen of ALV-infected roosters by artificial insemination from the Hy-line brown roosters. In addition, we defined four ALV-J infection states in plasma and semen of roosters (P+S+, P-S+, P+S-, and P-S-), which suggests that, in order to eradicate ALV in roosters, it is necessary to perform virus isolation using both semen and plasma. Additionally, ALV detection in semen by ELISA produced false-positive and false-negative results when compared to virus isolation in DF-1 cells. Collectively, our results suggested that an incomplete process of eradication of ALV from ALV-positive roosters led to the sporadic presence of ALV-J in laying hens.
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Affiliation(s)
- Fanfeng Meng
- College of Veterinary Medicine, China Agricultural University, Beijing, China
| | - Qiuchen Li
- College of Veterinary Medicine, China Agricultural University, Beijing, China
| | - Rui Han
- TECON Biopharmaceutical Co., Ltd., Xinjiang, China
| | - Guanlong Xu
- China Institute of Veterinary Drug Control, Beijing, China
| | - Xintao Gao
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Beijing, China
| | - Fubing Luo
- Beijing Center for Animal Disease Control and Prevention, Beijing, China
| | - Guangnian Shen
- Beijing Center for Animal Disease Control and Prevention, Beijing, China
| | - Xiaodong Liu
- Beijing Center for Animal Disease Control and Prevention, Beijing, China
| | - Zhifang Zhang
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Beijing, China
| | - Peng Zhao
- College of Veterinary Medicine, Shandong Agricultural University, Taian, Shandong, China.
| | - Guozhong Zhang
- College of Veterinary Medicine, China Agricultural University, Beijing, China.
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2
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Li J, Chen J, Dong X, Liang C, Guo Y, Chen X, Huang M, Liao M, Cao W. Residues 140-142, 199-200, 222-223, and 262 in the Surface Glycoprotein of Subgroup A Avian Leukosis Virus Are the Key Sites Determining Tva Receptor Binding Affinity and Infectivity. Front Microbiol 2022; 13:868377. [PMID: 35572683 PMCID: PMC9095613 DOI: 10.3389/fmicb.2022.868377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Accepted: 04/05/2022] [Indexed: 11/30/2022] Open
Abstract
Subgroup A avian leukosis virus (ALV-A) invades cells through gp85-encoded surface glycoprotein (SU) via specifically recognizing the cellular receptor Tva. To identify the key residues of ALV-A SU that determine the Tva binding affinity and infectivity in DF-1 cells, a strategy of substituting corresponding residues of SU between ALV-A RSA and ALV-E ev-1 (using Tvb as the receptor) was adopted. A series of chimeric soluble gp85 proteins were expressed for co-immunoprecipitation (co-IP) analysis and blocking analysis of viral entry, and various recombinant viruses based on replication-competent avian retrovirus vectors containing Bryan polymerase (RCASBP) were constructed for transfection into DF-1 cells and measurement of the percentage of GFP-positive cells. The results revealed that the substitution of residues V138, W140, Y141, L142, S145, and L154 of host range region 1 (hr1), residues V199, G200, Q202, R222, and R223 of host range region 2 (hr2), and residue G262 of variable region 3 (vr3) reduced the viral infectivity and Tva binding affinity, which was similar to the effects of the −139S, −151N, −155PWVNPF, −201NFD, Δ214–215, and −266S mutations. Our study indicated that hr1 and hr2 contain the principal receptor interaction determinants, with new identified-vr3 also playing a key role in the receptor binding affinity of ALV-A.
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Affiliation(s)
- Jinqun Li
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Jian Chen
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Xinyi Dong
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Canxin Liang
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Yanyan Guo
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Xiang Chen
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Mengyu Huang
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Ming Liao
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China.,Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, Guangzhou, China.,National and Regional Joint Engineering Laboratory for Medicament of Zoonosis Prevention and Control, South China Agricultural University, Guangzhou, China.,Key Laboratory of Veterinary Vaccine Innovation of the Ministry of Agriculture, Guangzhou, China.,Key Laboratory of Zoonosis of Ministry of Agriculture and Rural Affairs, Guangzhou, China
| | - Weisheng Cao
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China.,Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, Guangzhou, China.,National and Regional Joint Engineering Laboratory for Medicament of Zoonosis Prevention and Control, South China Agricultural University, Guangzhou, China.,Key Laboratory of Veterinary Vaccine Innovation of the Ministry of Agriculture, Guangzhou, China.,Key Laboratory of Zoonosis of Ministry of Agriculture and Rural Affairs, Guangzhou, China
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3
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Chen J, Li J, Li L, Liu P, Xiang Y, Cao W. Single Amino Acids G196 and R198 in hr1 of Subgroup K Avian Leukosis Virus Glycoprotein Are Critical for Tva Receptor Binding. Front Microbiol 2020; 11:596586. [PMID: 33391214 PMCID: PMC7772352 DOI: 10.3389/fmicb.2020.596586] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2020] [Accepted: 11/13/2020] [Indexed: 11/13/2022] Open
Abstract
Avian leukosis viruses (ALVs), a type of retrovirus responsible for various tumor diseases in chickens, are divided into 11 subgroups: ALV-A to ALV-K. After the envelope glycoproteins of ALV interact with the cellular receptor to initiate viral invasion, alterations in a few amino acids of the viral glycoproteins or cell receptors may trigger changes in their conformation and binding affinity. To identify the functional determinants of the ALV-K envelope protein that binds to Tva (a recently identified cellular receptor of ALV-K), using the strategy of continuous, segment-by-segment substitution of the gp85-encoded surface glycoprotein (SU) of ALV-K GDFX0602 with ALV-E ev-1 (using Tvb as the receptor), a series of chimeric soluble gp85 proteins were expressed for co-immunoprecipitation (co-IP) analysis and a series of recombinant viruses with replication-competent avian retrovirus vectors containing Bryan polymerase (RCASBP) as their skeleton were created for transfecting to DF-1 cells and titer determination. The co-IP analysis, fluorescence-activated cell sorting, and virus titer measurements revealed that the substitution of residues 194–198, 206–216 of hr1, residues 251–256 between hr1 and hr2, and residues 269–280 of hr2 were identified to reduce the binding of gp85 to Tva. The substitution of residues 194–221 in hr1 nullified the infectiveness of these viruses, similar to the effect of single amino acid mutations in K251E and L252I located between hr1 and hr2; continuous amino acid mutations in hr2 could not produce the same effect despite reducing their infectiveness. Finally, single amino acid mutations G196A and R198H nearly abolished the binding of gp85 to Tva and nullified the infectiveness of these viruses to DF-1. This study paves the way for exploring the molecular mechanisms of the binding of Tva to ALV-K SU.
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Affiliation(s)
- Jian Chen
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Jinqun Li
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Lizhen Li
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Peng Liu
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Yong Xiang
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Weisheng Cao
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China.,Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, China.,Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, Guangzhou, China.,Key Laboratory of Veterinary Vaccine Innovation of the Ministry of Agriculture, Guangzhou, China.,National and Regional Joint Engineering Laboratory for Medicament of Zoonosis Prevention and Control, Guangzhou, China
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4
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Prior Toxoplasma Gondii Infection Ameliorates Liver Fibrosis Induced by Schistosoma Japonicum through Inhibiting Th2 Response and Improving Balance of Intestinal Flora in Mice. Int J Mol Sci 2020; 21:ijms21082711. [PMID: 32295161 PMCID: PMC7216211 DOI: 10.3390/ijms21082711] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Revised: 04/01/2020] [Accepted: 04/09/2020] [Indexed: 02/06/2023] Open
Abstract
Schistosomiasis is an immunopathogenic disease in which a T helper (Th) cell type 2-like response plays vital roles. Hepatic fibrosis is its main pathologic manifestations, which is the leading cause of hepatic cirrhosis. Co-infections of Schistosoma japonicum (Sj) with other pathogens are frequently encountered but are easily ignored in clinical studies, and effective therapeutic interventions are lacking. In this study, we explored the effect of Toxoplasma gondii (Tg) prior infection on Th1/Th2 response, community shifts in gut microbiome (GM), and the pathogenesis of schistosomiasis in murine hosts. Mice were prior infected with Tg before Sj infection. The effects of co-infection on Th1/Th2 response and hepatic fibrosis were analyzed. Furthermore, we investigated this issue by sequencing 16S rRNA from fecal specimens to define the GM profiles during co-infection. Tg prior infection markedly reduced the granuloma size and collagen deposit in livers against Sj infection. Prior infection promoted a shift toward Th1 immune response instead of Th2. Furthermore, Tg infection promoted the expansion of preponderant flora and Clostridiaceae was identified as a feature marker in the GM of the co-infection group. Redundancy analysis (RDA)/canonical correspondence analysis (CCA) results showed that liver fibrosis, Th1/Th2 cytokines were significantly correlated (P < 0.05) with the GM compositions. Tg infection inhibits hepatic fibrosis by downregulating Th2 immune response against Sj infection, and further promotes the GM shifts through "gut-liver axis" in the murine hosts. Our study may provide insights into potential anti-fibrosis strategies in co-infection individuals.
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Chang F, Xing L, Xing Z, Yu M, Bao Y, Wang S, Farooque M, Li X, Liu P, Pan Q, Qi X, Gao L, Li K, Liu C, Zhang Y, Cui H, Wang X, Gao Y. Development and evaluation of a gp85 protein-based subgroup-specific indirect enzyme-linked immunosorbent assay for the detection of anti-subgroup J avian leukosis virus antibodies. Appl Microbiol Biotechnol 2020; 104:1785-1793. [PMID: 31900555 DOI: 10.1007/s00253-019-10320-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2019] [Revised: 12/08/2019] [Accepted: 12/15/2019] [Indexed: 12/11/2022]
Abstract
Avian leukosis virus subgroup J (ALV-J) is an important pathogen for various neoplasms and causes significant economic losses in the poultry industry. Serological detection of specific antibodies against ALV-J infection is important for successful clinical diagnosis. Here, a 293F stable cell line was established to stably express gp85 protein. In this cell line, gp85 protein was expressed at approximately 30 mg/L. A subgroup-specific indirect enzyme-linked immunosorbent assay (iELISA) was developed using ALV-J gp85 protein as coated antigen to detect antibodies against ALV-J. The sensitivity of the iELISA (1:51200 diluted in serum) was 16 times more than that of indirect immunofluorescence assay (IFA; 1:3200 diluted in serum). Moreover, there was no crossreactivity with antibodies against other common avian viruses and other avian leukosis virus subgroups, such as subgroups A and B. The practicality of the iELISA was further evaluated by experimental infection and clinical samples. The results from experimental infection indicated that anti-ALV-J antibodies were readily detected by iELISA as early as 4 weeks after ALV-J infection, and positive antibodies were detected until 20 weeks, with an antibody-positive rate of 11.1% to 33.3%. Moreover, analysis of clinical samples showed that 9.49% of samples were positive for anti-ALV-J antibodies, and the concordance rate of iELISA and IFA was 99.24%. Overall, these results suggested that the subgroup-specific iELISA developed in this study had good sensitivity, specificity, and feasibility. This iELISA will be very useful for epidemiological surveillance, diagnosis, and eradication of ALV-J in poultry farms.
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Affiliation(s)
- Fangfang Chang
- Avian Immunosuppressive Diseases Division, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, The Chinese Academy of Agricultural Sciences, No. 678 Haping Road, Xiangfang District, Harbin, 150069, Heilongjiang Province, People's Republic of China
| | - Lixiao Xing
- Avian Immunosuppressive Diseases Division, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, The Chinese Academy of Agricultural Sciences, No. 678 Haping Road, Xiangfang District, Harbin, 150069, Heilongjiang Province, People's Republic of China
| | - Zhifeng Xing
- Heilongjiang Provincial Center for Disease Control and Prevention, Harbin, 150030, People's Republic of China
| | - Mengmeng Yu
- Avian Immunosuppressive Diseases Division, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, The Chinese Academy of Agricultural Sciences, No. 678 Haping Road, Xiangfang District, Harbin, 150069, Heilongjiang Province, People's Republic of China
| | - Yuanling Bao
- Avian Immunosuppressive Diseases Division, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, The Chinese Academy of Agricultural Sciences, No. 678 Haping Road, Xiangfang District, Harbin, 150069, Heilongjiang Province, People's Republic of China
| | - Suyan Wang
- Avian Immunosuppressive Diseases Division, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, The Chinese Academy of Agricultural Sciences, No. 678 Haping Road, Xiangfang District, Harbin, 150069, Heilongjiang Province, People's Republic of China
| | - Muhammad Farooque
- Avian Immunosuppressive Diseases Division, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, The Chinese Academy of Agricultural Sciences, No. 678 Haping Road, Xiangfang District, Harbin, 150069, Heilongjiang Province, People's Republic of China
| | - Xinyi Li
- Avian Immunosuppressive Diseases Division, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, The Chinese Academy of Agricultural Sciences, No. 678 Haping Road, Xiangfang District, Harbin, 150069, Heilongjiang Province, People's Republic of China
| | - Peng Liu
- Avian Immunosuppressive Diseases Division, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, The Chinese Academy of Agricultural Sciences, No. 678 Haping Road, Xiangfang District, Harbin, 150069, Heilongjiang Province, People's Republic of China
| | - Qing Pan
- Avian Immunosuppressive Diseases Division, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, The Chinese Academy of Agricultural Sciences, No. 678 Haping Road, Xiangfang District, Harbin, 150069, Heilongjiang Province, People's Republic of China
| | - Xiaole Qi
- Avian Immunosuppressive Diseases Division, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, The Chinese Academy of Agricultural Sciences, No. 678 Haping Road, Xiangfang District, Harbin, 150069, Heilongjiang Province, People's Republic of China
| | - Li Gao
- Avian Immunosuppressive Diseases Division, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, The Chinese Academy of Agricultural Sciences, No. 678 Haping Road, Xiangfang District, Harbin, 150069, Heilongjiang Province, People's Republic of China
| | - Kai Li
- Avian Immunosuppressive Diseases Division, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, The Chinese Academy of Agricultural Sciences, No. 678 Haping Road, Xiangfang District, Harbin, 150069, Heilongjiang Province, People's Republic of China
| | - Changjun Liu
- Avian Immunosuppressive Diseases Division, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, The Chinese Academy of Agricultural Sciences, No. 678 Haping Road, Xiangfang District, Harbin, 150069, Heilongjiang Province, People's Republic of China
| | - Yanping Zhang
- Avian Immunosuppressive Diseases Division, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, The Chinese Academy of Agricultural Sciences, No. 678 Haping Road, Xiangfang District, Harbin, 150069, Heilongjiang Province, People's Republic of China
| | - Hongyu Cui
- Avian Immunosuppressive Diseases Division, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, The Chinese Academy of Agricultural Sciences, No. 678 Haping Road, Xiangfang District, Harbin, 150069, Heilongjiang Province, People's Republic of China
| | - Xiaomei Wang
- Avian Immunosuppressive Diseases Division, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, The Chinese Academy of Agricultural Sciences, No. 678 Haping Road, Xiangfang District, Harbin, 150069, Heilongjiang Province, People's Republic of China. .,Jiangsu Co-innovation Center for the Prevention and Control of Important Animal Infectious Disease and Zoonose, Yangzhou University, Yangzhou, 225009, China.
| | - Yulong Gao
- Avian Immunosuppressive Diseases Division, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, The Chinese Academy of Agricultural Sciences, No. 678 Haping Road, Xiangfang District, Harbin, 150069, Heilongjiang Province, People's Republic of China.
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Gao X, Li Q, Fang L, Song H, Cui Z, Meng F, Zhang Z. The follicle promotes the evolution of variants of avian leukosis virus subgroup J in vertical transmission. Biochem Biophys Res Commun 2019; 521:1089-1094. [PMID: 31733830 DOI: 10.1016/j.bbrc.2019.11.042] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2019] [Accepted: 11/05/2019] [Indexed: 11/17/2022]
Abstract
Avian leukosis virus (ALV) is one of the main causative agent of tumor development, which brings enormous economic losses to the poultry industry worldwide. ALV can be transmitted horizontally and vertically, and the latter often give rise to more adverse pathogenicity. However, the propagation and evolution of ALV underlying vertical transmission remain not-well understood. Herein, an animal model for the evolution of variants of ALV subgroup J (ALV-J) in the vertical transmission was built and different organs from infected hens and plasma from their ALV-positive progenies were collected, and then three segments in the hypervariable regions of ALV (gp85-A, gp85-B, LTR-C) were amplified and sequenced using conventional Sanger sequencing and MiSeq high-throughput sequencing, respectively. The results showed that the genomic diversity of ALV-J occurred in different organs from ALV-J infected hen, and that the dominant variants in different organs of parental hens, especially in follicle, changed significantly compared with original inoculum strain. Notably, the dominant variants in progenies exhibited higher homologies with variants in parental hens' follicle (88.9%-98.9%) than other organs (85.6%-91.1%), and most consistent mutations in the variants were observed between the progenies and parental hen's follicle. Furthermore, HyPhy analysis indicated that the global selection pressure value (ω) in the follicle is significantly higher than those in other organs. In summary, an animal model for vertical transmission was built and our findings revealed the evolution of variants of ALV in the process of vertical transmission, moreover, the variants were most likely to be taken to the next generation via follicle, which may be related to the higher selection pressure follicle underwent.
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Affiliation(s)
- Xintao Gao
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Beijing, 100081, China; Institute of Animal Sciences, Chinese Academy of Agricultural Sciences (CAAS), Beijing, 100193, China
| | - Qiuchen Li
- College of Veterinary Medicine, China Agricultural University, Beijing, 100094, China
| | - Lichun Fang
- Institute of Animal Sciences, Chinese Academy of Agricultural Sciences (CAAS), Beijing, 100193, China
| | - Haozhi Song
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Beijing, 100081, China
| | - Zhizhong Cui
- College of Veterinary Medicine, Shandong Agricultural University, Tai'an, Shandong, 271018, China
| | - Fanfeng Meng
- College of Veterinary Medicine, China Agricultural University, Beijing, 100094, China.
| | - Zhifang Zhang
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Beijing, 100081, China.
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Wang S, Geng N, Zhou D, Qu Y, Shi M, Xu Y, Liu K, Liu Y, Liu J. Oral Immunization of Chickens With Recombinant Lactobacillus plantarum Vaccine Against Early ALV-J Infection. Front Immunol 2019; 10:2299. [PMID: 31632395 PMCID: PMC6783503 DOI: 10.3389/fimmu.2019.02299] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2018] [Accepted: 09/11/2019] [Indexed: 12/15/2022] Open
Abstract
In this study, a novel oral vaccine of recombinant Lactobacillus plantarum (L. plantarum) containing the gp85 protein was explored, and the effects of this vaccine on the prevention of subgroup J Avian Leukosis Virus (ALV-J) infection were assessed. In the current study, the gp85 protein of ALV-J was expressed on the surface of L. plantarum with the surface-display motif, pgsA, by constructing a shuttle vector pMG36e:pgsA:gp85. Surface localization of the fusion protein was verified by western blotting and flow cytometry. Subsequently, Specific Pathogen Free Hy-Line Brown layer chickens were orally vaccinated with the recombinant L. plantarum and presented with high levels of serum immunoglobulin G (IgG) and secretory immunoglobulin A (sIgA) titers in bile and duodenal-mucosal fluid. After challenged with ALV-J of a 3 × 103 50% tissue culture infective dose (TCID50), serum samples of the chickens were collected and viremia was analyzed. Results showed that, compared to the L. plantarum and PBS control group, the recombinant L. plantarum group showed a significant rise in antibody levels after inoculation, and provide improved protection against ALV-J according to viremia detection. These results indicate that oral immunization with the recombinant L. plantarum provided an effective means for eliciting protective immune response against early ALV-J infection.
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Affiliation(s)
- Shenghua Wang
- College of Veterinary Medicine, Shandong Agricultural University, Tai'an, China.,Shandong Provincial Engineering Technology Research Center of Animal Disease Control and Prevention, Shandong Agricultural University, Tai'an, China
| | - Na Geng
- Research Center for Animal Disease Control Engineering, Shandong Agricultural University, Tai'an, China
| | - Dong Zhou
- College of Veterinary Medicine, Northwest Agriculture and Forestry University, Yangling, China
| | - Yi Qu
- Nanjing Entry-Exit Inspection and Quarantine Bureau, Nanjing, China
| | - Mengke Shi
- Research Center for Animal Disease Control Engineering, Shandong Agricultural University, Tai'an, China
| | - Yuliang Xu
- College of Veterinary Medicine, Shandong Agricultural University, Tai'an, China
| | - Kangping Liu
- College of Veterinary Medicine, Shandong Agricultural University, Tai'an, China
| | - Yongxia Liu
- Research Center for Animal Disease Control Engineering, Shandong Agricultural University, Tai'an, China
| | - Jianzhu Liu
- College of Veterinary Medicine, Shandong Agricultural University, Tai'an, China
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Qian K, Tian X, Shao H, Ye J, Yao Y, Nair V, Qin A. Identification of novel B-cell epitope in gp85 of subgroup J avian leukosis virus and its application in diagnosis of disease. BMC Vet Res 2018; 14:295. [PMID: 30257680 PMCID: PMC6158924 DOI: 10.1186/s12917-018-1622-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Accepted: 09/21/2018] [Indexed: 11/23/2022] Open
Abstract
Background The gp85 is the main envelope protein of avian leukosis subgroup J (ALV-J) involved in virus neutralization. Here, we mapped the epitope in ALV-J gp85 by ELISA using synthetic peptides and developed epitope based diagnostic methods for ALV-J infection. Results The results revealed that monoclonal antibody (mAb) JE9 recognized 83WDPQEL88 motif, which was highly conserved in gp85 among different ALV-J strains by homology analysis. Moreover, after evaluation with two hundred and forty sera samples obtained from different chicken farms, the epitope-based peptide ELISA had much higher sensitivity than commercial ELISA kit for antibody detection of ALV-J. Conclusions A novel B-cell epitope recognized by the mAb JE9 was identified. The developed peptide-ELISA based on this novel B-cell epitope could be useful in laboratory viral diagnosis, routine surveillance in chicken farms, and also in understanding the pathogenesis of ALV-J.
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Affiliation(s)
- Kun Qian
- Ministry of Education Key Lab for Avian Preventive Medicine, College of Veterinary Medicine, Yangzhou University, No.12 East Wenhui Road, Yangzhou, Jiangsu, 225009, People's Republic of China.,The International Joint Laboratory for Cooperation in Agriculture and Agricultural Product Safety, Ministry of Education, Yangzhou University, 225009, Yangzhou, People's Republic of China.,Jiangsu Key Lab of Zoonosis, No.12 East Wenhui Road, Yangzhou, Jiangsu, 225009, People's Republic of China
| | - Xue Tian
- Ministry of Education Key Lab for Avian Preventive Medicine, College of Veterinary Medicine, Yangzhou University, No.12 East Wenhui Road, Yangzhou, Jiangsu, 225009, People's Republic of China
| | - Hongxia Shao
- Ministry of Education Key Lab for Avian Preventive Medicine, College of Veterinary Medicine, Yangzhou University, No.12 East Wenhui Road, Yangzhou, Jiangsu, 225009, People's Republic of China.,The International Joint Laboratory for Cooperation in Agriculture and Agricultural Product Safety, Ministry of Education, Yangzhou University, 225009, Yangzhou, People's Republic of China.,Jiangsu Key Lab of Zoonosis, No.12 East Wenhui Road, Yangzhou, Jiangsu, 225009, People's Republic of China
| | - Jianqiang Ye
- Ministry of Education Key Lab for Avian Preventive Medicine, College of Veterinary Medicine, Yangzhou University, No.12 East Wenhui Road, Yangzhou, Jiangsu, 225009, People's Republic of China.,The International Joint Laboratory for Cooperation in Agriculture and Agricultural Product Safety, Ministry of Education, Yangzhou University, 225009, Yangzhou, People's Republic of China.,Jiangsu Key Lab of Zoonosis, No.12 East Wenhui Road, Yangzhou, Jiangsu, 225009, People's Republic of China
| | - Yongxiu Yao
- Avian Oncogenic Virus Group, The Pirbright Institute, Ash Road, Pirbright, Surrey, GU24 0NF, UK.,The UK-China Centre of Excellence for Research on Avian Diseases, 169 Huanghe 2nd Road, Binzhou, Shandong, People's Republic of China
| | - Venugopal Nair
- Avian Oncogenic Virus Group, The Pirbright Institute, Ash Road, Pirbright, Surrey, GU24 0NF, UK.,The UK-China Centre of Excellence for Research on Avian Diseases, 169 Huanghe 2nd Road, Binzhou, Shandong, People's Republic of China
| | - Aijian Qin
- Ministry of Education Key Lab for Avian Preventive Medicine, College of Veterinary Medicine, Yangzhou University, No.12 East Wenhui Road, Yangzhou, Jiangsu, 225009, People's Republic of China. .,The International Joint Laboratory for Cooperation in Agriculture and Agricultural Product Safety, Ministry of Education, Yangzhou University, 225009, Yangzhou, People's Republic of China. .,Jiangsu Key Lab of Zoonosis, No.12 East Wenhui Road, Yangzhou, Jiangsu, 225009, People's Republic of China.
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