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Silva Júnior JVJ, da Silva ANMR, da Silva Santos JJ, Gil LHVG. Reverse Genetics of Dengue Virus. Methods Mol Biol 2024; 2733:231-248. [PMID: 38064036 DOI: 10.1007/978-1-0716-3533-9_14] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2023]
Abstract
Dengue virus (DENV) is one of the most important and widespread arthropod-borne viruses, causing millions of infections over the years. Considering its epidemiological importance, efforts have been directed towards understanding various aspects of DENV biology, which have been facilitated by the development of different molecular strategies for engineering viral genomes, such as reverse genetics approaches. Reverse genetic systems are a powerful tool for investigating virus-host interaction, for vaccine development, and for high-throughput screening of antiviral compounds. However, stable manipulation of DENV genomes is a major molecular challenge, especially when using conventional cloning systems. To circumvent this issue, we describe a simple and efficient yeast-based reverse genetics system to recover infectious DENV clones.
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Affiliation(s)
- José Valter Joaquim Silva Júnior
- Virology Sector, Department of Preventive Veterinary Medicine, Federal University of Santa Maria, Santa Maria, RS, Brazil
- Virology Sector, Laboratory of Immunopathology Keizo Asami, Federal University of Pernambuco, Recife, PE, Brazil
| | | | | | - Laura Helena Vega Gonzales Gil
- Laboratory of Virology and Experimental Therapy, Aggeu Magalhães Institute, Oswaldo Cruz Foundation, Recife, PE, Brazil.
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Cherkashchenko L, Gros N, Trausch A, Neyret A, Hénaut M, Dubois G, Villeneuve M, Chable-Bessia C, Lyonnais S, Merits A, Muriaux D. Validation of flavivirus infectious clones carrying fluorescent markers for antiviral drug screening and replication studies. Front Microbiol 2023; 14:1201640. [PMID: 37779700 PMCID: PMC10541152 DOI: 10.3389/fmicb.2023.1201640] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2023] [Accepted: 08/17/2023] [Indexed: 10/03/2023] Open
Abstract
Flaviviruses have emerged as major arthropod-transmitted pathogens and represent an increasing public health problem worldwide. High-throughput screening can be facilitated using viruses that easily express detectable marker proteins. Therefore, developing molecular tools, such as reporter-carrying versions of flaviviruses, for studying viral replication and screening antiviral compounds represents a top priority. However, the engineering of flaviviruses carrying either fluorescent or luminescent reporters remains challenging due to the genetic instability caused by marker insertion; therefore, new approaches to overcome these limitations are needed. Here, we describe reverse genetic methods that include the design and validation of infectious clones of Zika, Kunjin, and Dengue viruses harboring different reporter genes for infection, rescue, imaging, and morphology using super-resolution microscopy. It was observed that different flavivirus constructs with identical designs displayed strikingly different genetic stabilities, and corresponding virions resembled wild-type virus particles in shape and size. A successful strategy was assessed to increase the stability of rescued reporter virus and permit antiviral drug screening based on quantitative automated fluorescence microscopy and replication studies.
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Affiliation(s)
- Liubov Cherkashchenko
- CEMIPAI UAR3725 CNRS, University of Montpellier, Montpellier, France
- Institute of Technology, University of Tartu, Tartu, Estonia
| | - Nathalie Gros
- CEMIPAI UAR3725 CNRS, University of Montpellier, Montpellier, France
| | - Alice Trausch
- CEMIPAI UAR3725 CNRS, University of Montpellier, Montpellier, France
| | - Aymeric Neyret
- CEMIPAI UAR3725 CNRS, University of Montpellier, Montpellier, France
| | - Mathilde Hénaut
- CEMIPAI UAR3725 CNRS, University of Montpellier, Montpellier, France
| | - Gregor Dubois
- CEMIPAI UAR3725 CNRS, University of Montpellier, Montpellier, France
| | | | | | | | - Andres Merits
- Institute of Technology, University of Tartu, Tartu, Estonia
| | - Delphine Muriaux
- CEMIPAI UAR3725 CNRS, University of Montpellier, Montpellier, France
- IRIM UMR9004 CNRS, University of Montpellier, Montpellier, France
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Hu M, Li WF, Wu T, Yang Y, Chen G, Chen T, Liu Y, Mei Y, Wu D, Wei Y, Luo T, Zhang HJ, Li YP. Identification of an Arylnaphthalene Lignan Derivative as an Inhibitor against Dengue Virus Serotypes 1 to 4 (DENV-1 to -4) Using a Newly Developed DENV-3 Infectious Clone and Replicon. Microbiol Spectr 2023; 11:e0042323. [PMID: 37378517 PMCID: PMC10434217 DOI: 10.1128/spectrum.00423-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Accepted: 06/03/2023] [Indexed: 06/29/2023] Open
Abstract
Dengue virus (DENV) is the most widespread arbovirus, causing symptoms ranging from dengue fever to severe dengue, including hemorrhagic fever and shock syndrome. Four serotypes of DENV (DENV-1 to -4) can infect humans; however, no anti-DENV drug is available. To facilitate the study of antivirals and viral pathogenesis, here we developed an infectious clone and a subgenomic replicon of DENV-3 strains for anti-DENV drug discovery by screening a synthetic compound library. The viral cDNA was amplified from a serum sample from a DENV-3-infected individual during the 2019 epidemic; however, fragments containing the prM-E-partial NS1 region could not be cloned until a DENV-3 consensus sequence with 19 synonymous substitutions was introduced to reduce putative Escherichia coli promoter activity. Transfection of the resulting cDNA clone, plasmid DV3syn, released an infectious virus titer of 2.2 × 102 focus-forming units (FFU)/mL. Through serial passages, four adaptive mutations (4M) were identified, and addition of 4M generated recombinant DV3syn_4M, which produced viral titers ranging from 1.5 × 104 to 6.7 × 104 FFU/mL and remained genetically stable in transformant bacteria. Additionally, we constructed a DENV-3 subgenomic replicon and screened an arylnaphthalene lignan library, from which C169-P1 was identified as exhibiting inhibitory effects on viral replicon. A time-of-drug addition assay revealed that C169-P1 also impeded the internalization process of cell entry. Furthermore, we demonstrated that C169-P1 inhibited the infectivity of DV3syn_4M, as well as DENV-1, DENV-2, and DENV-4, in a dose-dependent manner. This study provides an infectious clone and a replicon for the study of DENV-3 and a candidate compound for future development against DENV-1 to -4 infections. IMPORTANCE Dengue virus (DENV) is the most prevalent mosquito-transmitted virus, and there is no an anti-dengue drug. Reverse genetic systems representative of different serotype viruses are invaluable tools for the study of viral pathogenesis and antiviral drugs. Here, we developed an efficient infectious clone of a clinical DENV-3 genotype III isolate. We successfully overcame the instability of flavivirus genome-length cDNA in transformant bacteria, an unsolved issue for construction of cDNA clones of flaviviruses, and adapted this clone to efficiently produce infectious viruses following plasmid transfection of cell culture. Moreover, we constructed a DENV-3 subgenomic replicon and screened a compound library. An arylnaphthalene lignan, C169-P1, was identified as an inhibitor of virus replication and cell entry. Finally, we demonstrated that C169-P1 exhibited a broad-spectrum antiviral effect against the infections with DENV-1 to -4. The reverse genetic systems and the compound candidate described here facilitate the study of DENV and related RNA viruses.
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Affiliation(s)
- Mingyue Hu
- Institute of Human Virology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
- Department of Pathogen Biology and Biosecurity, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
- Key Laboratory of Tropical Disease Control of Ministry of Education, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
- College of Animal Science and Veterinary Medicine, Guangxi University, Nanning, China
| | - Wan-Fei Li
- School of Chinese Medicine, Hong Kong Baptist University, Kowloon, Hong Kong, China
| | - Tiantian Wu
- Institute of Human Virology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
- Department of Pathogen Biology and Biosecurity, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
- Key Laboratory of Tropical Disease Control of Ministry of Education, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
- Department of Infectious Diseases, The Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou, China
| | - Yang Yang
- Institute of Human Virology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
- Department of Pathogen Biology and Biosecurity, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
- Key Laboratory of Tropical Disease Control of Ministry of Education, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
| | - Guoquan Chen
- College of Animal Science and Veterinary Medicine, Guangxi University, Nanning, China
| | - Tongling Chen
- Institute of Human Virology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
- Department of Pathogen Biology and Biosecurity, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
- Key Laboratory of Tropical Disease Control of Ministry of Education, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
| | - Yongchen Liu
- Institute of Human Virology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
- Department of Pathogen Biology and Biosecurity, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
- Key Laboratory of Tropical Disease Control of Ministry of Education, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
| | - Yaqing Mei
- Institute of Human Virology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
- Department of Pathogen Biology and Biosecurity, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
- Key Laboratory of Tropical Disease Control of Ministry of Education, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
| | - De Wu
- Institute of Pathogenic Microbiology, Center for Disease Control and Prevention of Guangdong, Guangzhou, China
| | - Youchuan Wei
- College of Animal Science and Veterinary Medicine, Guangxi University, Nanning, China
| | - Tingrong Luo
- College of Animal Science and Veterinary Medicine, Guangxi University, Nanning, China
| | - Hong-Jie Zhang
- School of Chinese Medicine, Hong Kong Baptist University, Kowloon, Hong Kong, China
| | - Yi-Ping Li
- Institute of Human Virology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
- Department of Pathogen Biology and Biosecurity, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
- Key Laboratory of Tropical Disease Control of Ministry of Education, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
- Department of Infectious Diseases, The Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou, China
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Oliveira RA, de Oliveira-Filho EF, Fernandes AI, Brito CA, Marques ET, Tenório MC, Gil LH. Previous dengue or Zika virus exposure can drive to infection enhancement or neutralisation of other flaviviruses. Mem Inst Oswaldo Cruz 2019; 114:e190098. [PMID: 31411310 PMCID: PMC6690646 DOI: 10.1590/0074-02760190098] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2019] [Accepted: 07/12/2019] [Indexed: 12/01/2022] Open
Abstract
BACKGROUND Dengue virus (DENV) has circulated in Brazil for over 30 years. During this
time, one serotype has cyclically replaced the other, until recently, when
all four distinct serotypes began to circulate together. Persistent
circulation of DENV for long time periods makes sequential infections
throughout a person’s life possible. After primary DENV infection, life-long
immunity is developed for the infecting serotype. Since DENV and Zika virus
(ZIKV) are antigenically similar, the possibility of cross-reactions has
attracted attention and has been demonstrated in vitro. OBJECTIVE The aim of this study was to investigate whether immune-sera from DENV and
ZIKV infected patients would cross-react in vitro with
other Flaviviridae family members. METHODS Cross-reaction of the studied samples with yellow fever virus (YFV), West
Nile virus (WNV), Rocio virus (ROCV), Saint Louis virus (SLEV) and Ilheus
virus (ILHV) has been investigated by plaque reduction neutralisation test
(PRNT) and the antibody-dependent enhancement (ADE) by flow-cytometry. FINDINGS Antibodies against ZIKV and DENV virus cross-reacted with other flaviviruses
either neutralising or enhancing the infection. Thus, viral entrance into
FcRFcɣRII-expressing cells were influenced by the cross-reactive antibodies.
ZIKV or DENV immune sera enhanced cellular infection by WNV, ILHV, ROCV and
SLEV. Finally, DENV immune sera presented higher neutralising activity for
YFV and SLEV. While ZIKV immune sera neutralised WNV, ILHV and ROCV with
high frequencies of positivity. MAIN CONCLUSIONS The co-circulation of those viruses in the same area represents a risk for
the development of severe infections if they spread throughout the country.
Successive flavivirus infections may have an impact on disease pathogenesis,
as well as on the development of safe vaccine strategies.
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Affiliation(s)
- Renato As Oliveira
- Fundação Oswaldo Cruz, Instituto Aggeu Magalhães, Departamento de Virologia, Recife, PE, Brasil.,Universidade Federal da Paraíba, Departamento de Fisiologia e Patologia, João Pessoa, PB, Brasil
| | - Edmilson F de Oliveira-Filho
- Fundação Oswaldo Cruz, Instituto Aggeu Magalhães, Departamento de Virologia, Recife, PE, Brasil.,Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Ana Iv Fernandes
- Universidade Federal da Paraíba, Hospital Universitário Lauro Wanderley, Serviço de Doenças Infecciosas e Parasitárias, João Pessoa, PB, Brasil.,Universidade Federal da Paraíba, Escola Técnica de Saúde, Grupo de Estudos e Pesquisas em Imunologia Humana, João Pessoa, PB, Brasil
| | - Carlos Aa Brito
- Universidade Federal de Pernambuco, Departamento de Medicina Clínica, Recife, PE, Brasil
| | - Ernesto Ta Marques
- Fundação Oswaldo Cruz, Instituto Aggeu Magalhães, Departamento de Virologia, Recife, PE, Brasil.,University of Pittsburgh, Center for Vaccine Research, Department of Infectious Diseases and Microbiology, Pittsburgh, PA, USA
| | - Marli C Tenório
- Fundação Oswaldo Cruz, Instituto Aggeu Magalhães, Departamento de Virologia, Recife, PE, Brasil
| | - Laura Hgv Gil
- Fundação Oswaldo Cruz, Instituto Aggeu Magalhães, Departamento de Virologia, Recife, PE, Brasil
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Qi X, Han Y, Jiang P, Yue X, Ren HN, Sun GG, Long SR, Yu C, Cheng XC, Cui J, Wang ZQ. Oral vaccination with Trichinella spiralis DNase II DNA vaccine delivered by attenuated Salmonella induces a protective immunity in BALB/c mice. Vet Res 2018; 49:119. [PMID: 30518422 PMCID: PMC6280372 DOI: 10.1186/s13567-018-0614-y] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2018] [Accepted: 11/07/2018] [Indexed: 02/02/2023] Open
Abstract
Trichinellosis is one of the most serious foodborne parasitic zoonosis with worldwide distribution, and it is necessary to develop a vaccine to interrupt transmission from animals to humans. Trichinella spiralis adult-specific DNase II-1 (TsDNase II) were identified by immunoproteomics in surface or excretory/secretory proteins of adult worms (AW) and intestinal infective larvae (IIL). The aim of this study was to investigate the systemic, mucosal responses and immune protection elicited by oral vaccination with TsDNase II DNA vaccine delivered by attenuated Salmonella typhimurium strain⊿cyaSL1344. Oral vaccination with TsDNase II DNA vaccine triggered an obvious mucosal sIgA response and a systemic IgG response in mice, and IgG1 was predominant. Th1 (IFN-γ) and Th2 (IL-4, 10) cytokines were distinctly increased in the spleen and mesenteric lymph node (MLN) cells of vaccinated mice. An indirect immunofluorescent test revealed that native TsDNase II is present at the cuticle of this nematode after the 2nd molting, further confirming that TsDNase II is adult-specific and expressed at AW and pre-adult stages. Oral immunization of mice with TsDNase II exhibited a 53.85% reduction in AW and a 59.26% reduction in ML after larval challenge. The in vitro NBL production of adult females from TsDNase II-vaccinated mice was also reduced in comparison with pcDNA3.1 or the PBS control group (P < 0.01). Our results show that oral immunization of mice with TsDNase II produced an intestinal and systematic concurrent Th1/Th2 immune response, and a significant immune protection against challenge.
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Affiliation(s)
- Xin Qi
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China
| | - Yue Han
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China
| | - Peng Jiang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China
| | - Xin Yue
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China
| | - Hua Nan Ren
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China
| | - Ge Ge Sun
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China
| | - Shao Rong Long
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China
| | - Chuan Yu
- Key Lab of Animal Disease and Public Health, College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, 471003, China
| | - Xiang Chao Cheng
- Key Lab of Animal Disease and Public Health, College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, 471003, China
| | - Jing Cui
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China.
| | - Zhong Quan Wang
- Department of Parasitology, Medical College, Zhengzhou University, Zhengzhou, 450052, China.
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Characterization of cis-Acting RNA Elements of Zika Virus by Using a Self-Splicing Ribozyme-Dependent Infectious Clone. J Virol 2017; 91:JVI.00484-17. [PMID: 28814522 DOI: 10.1128/jvi.00484-17] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2017] [Accepted: 07/27/2017] [Indexed: 12/13/2022] Open
Abstract
Zika virus (ZIKV) has caused significant outbreaks and epidemics in the Americas recently, raising global concern due to its ability to cause microcephaly and other neurological complications. A stable and efficient infectious clone of ZIKV is urgently needed. However, the instability and toxicity of flavivirus cDNA clones in Escherichia coli hosts has hindered the development of ZIKV infectious clones. Here, using a novel self-splicing ribozyme-based strategy, we generated a stable infectious cDNA clone of a contemporary ZIKV strain imported from Venezuela to China in 2016. The constructed clone contained a modified version of the group II self-splicing intron P.li.LSUI2 near the junction between the E and NS1 genes, which were removed from the RNA transcripts by an easy-to-establish in vitro splicing reaction. Transfection of the spliced RNAs into BHK-21 cells led to the production of infectious progeny virus that resembled the parental virus. Finally, potential cis-acting RNA elements in ZIKV genomic RNA were identified based on this novel reverse genetics system, and the critical role of 5'-SLA promoter and 5'-3' cyclization sequences were characterized by a combination of different assays. Our results provide another stable and reliable reverse genetics system for ZIKV that will help study ZIKV infection and pathogenesis, and the novel self-splicing intron-based strategy could be further expanded for the construction of infectious clones from other emerging and reemerging flaviviruses.IMPORTANCE The ongoing Zika virus (ZIKV) outbreaks have drawn global concern due to the unexpected causal link to fetus microcephaly and other severe neurological complications. The infectious cDNA clones of ZIKV are critical for the research community to study the virus, understand the disease, and inform vaccine design and antiviral screening. A panel of existing technologies have been utilized to develop ZIKV infectious clones. Here, we successfully generated a stable infectious clone of a 2016 ZIKV strain using a novel self-splicing ribozyme-based technology that abolished the potential toxicity of ZIKV cDNA clones to the E. coli host. Moreover, two crucial cis-acting replication elements (5'-SLA and 5'-CS) of ZIKV were first identified using this novel reverse genetics system. This novel self-splicing ribozyme-based reverse genetics platform will be widely utilized in future ZIKV studies and provide insight for the development of infectious clones of other emerging viruses.
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Use of homologous recombination in yeast to create chimeric bovine viral diarrhea virus cDNA clones. Braz J Microbiol 2016; 47:993-999. [PMID: 27522929 PMCID: PMC5052387 DOI: 10.1016/j.bjm.2016.07.022] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2015] [Accepted: 04/25/2016] [Indexed: 01/11/2023] Open
Abstract
The open reading frame of a Brazilian bovine viral diarrhea virus (BVDV) strain, IBSP4ncp, was recombined with the untranslated regions of the reference NADL strain by homologous recombination in Saccharomyces cerevisiae, resulting in chimeric full-length cDNA clones of BVDV (chi-NADL/IBSP4ncp#2 and chi-NADL/IBSP4ncp#3). The recombinant clones were successfully recovered, resulting in viable viruses, having the kinetics of replication, focus size, and morphology similar to those of the parental virus, IBSP4ncp. In addition, the chimeric viruses remained stable for at least 10 passages in cell culture, maintaining their replication efficiency unaltered. Nucleotide sequencing revealed a few point mutations; nevertheless, the phenotype of the rescued viruses was nearly identical to that of the parental virus in all experiments. Thus, genetic stability of the chimeric clones and their phenotypic similarity to the parental virus confirm the ability of the yeast-based homologous recombination to maintain characteristics of the parental virus from which the recombinant viruses were derived. The data also support possible use of the yeast system for the manipulation of the BVDV genome.
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Liu P, Cui J, Liu RD, Wang M, Jiang P, Liu LN, Long SR, Li LG, Zhang SB, Zhang XZ, Wang ZQ. Protective immunity against Trichinella spiralis infection induced by TsNd vaccine in mice. Parasit Vectors 2015; 8:185. [PMID: 25889976 PMCID: PMC4382852 DOI: 10.1186/s13071-015-0791-8] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2015] [Accepted: 03/10/2015] [Indexed: 01/13/2023] Open
Abstract
Background We have previously reported that Trichinella spiralis Nudix hydrolase (TsNd) bound to intestinal epithelial cells (IECs), and vaccination of mice with recombinant TsNd protein (rTsNd) produced a partial protective immunity. The aim of this study was to investigate the immune protection induced by TsNd DNA vaccine. Methods The full-length cDNA sequence of TsNd gene was cloned into pcDNA3.1 and used to immunize BALB/c mice by intramuscular injection. Transcription and expression of TsNd were detected by RT-PCR and IFT. The levels of specific IgA, IgG, IgG1 and IgG2a, and cytokines were assayed by ELISA at weeks 0, 6 and 8 post-immunization. The immune protection of TsNd DNA vaccine against challenge infection was investigated. Results Immunization of mice with TsNd DNA elicited a systemic Th1/Th2 immune response and a local mucosal IgA response. The in vitro transcription and expression of TsNd gene was observed at all developmental stages of T. spiralis (ML, IIL, AW and NBL). Anti-rTsNd IgG levels were increased after immunization and levels of IgG1 were obviously higher than that of IgG2a. Intestinal specific IgA levels of immunized mice were significantly higher than those of vector and PBS control mice. Cytokine profiling also showed a significant increase in Th1 (IFN-γ, IL-2) and Th2 (IL-4, 10) responses in splenocytes of immunized mice on stimulation with rTsNd. Vaccination of mice with pcDNA3.1-TsNd displayed a 40.44% reduction in adult worms and a 53.9% reduction in larval burden. Conclusions TsNd DNA induced a mixed Th1/Th2 immune response and partial protection against T. spiralis infection in mice.
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Affiliation(s)
- Pei Liu
- Department of Parasitology, Medical College, Zhengzhou University, 40 Daxue Road, Zhengzhou, 450052, P. R. China.
| | - Jing Cui
- Department of Parasitology, Medical College, Zhengzhou University, 40 Daxue Road, Zhengzhou, 450052, P. R. China.
| | - Ruo Dan Liu
- Department of Parasitology, Medical College, Zhengzhou University, 40 Daxue Road, Zhengzhou, 450052, P. R. China.
| | - Min Wang
- Department of Infection Control, The Second People's Hospital of Zhengzhou City, Zhengzhou, 450000, P. R. China.
| | - Peng Jiang
- Department of Parasitology, Medical College, Zhengzhou University, 40 Daxue Road, Zhengzhou, 450052, P. R. China.
| | - Li Na Liu
- Department of Parasitology, Medical College, Zhengzhou University, 40 Daxue Road, Zhengzhou, 450052, P. R. China.
| | - Shao Rong Long
- Department of Parasitology, Medical College, Zhengzhou University, 40 Daxue Road, Zhengzhou, 450052, P. R. China.
| | - Ling Ge Li
- Department of Parasitology, Medical College, Zhengzhou University, 40 Daxue Road, Zhengzhou, 450052, P. R. China.
| | - Shuai Bing Zhang
- Department of Parasitology, Medical College, Zhengzhou University, 40 Daxue Road, Zhengzhou, 450052, P. R. China.
| | - Xin Zhuo Zhang
- Department of Parasitology, Medical College, Zhengzhou University, 40 Daxue Road, Zhengzhou, 450052, P. R. China.
| | - Zhong Quan Wang
- Department of Parasitology, Medical College, Zhengzhou University, 40 Daxue Road, Zhengzhou, 450052, P. R. China.
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9
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Kellner AWA. New information on molecular features of the dengue virus type 3, panorama of the amphibian research in Brazil, and a new extinct Cretaceous angiosperm. AN ACAD BRAS CIENC 2015; 86:1547-8. [PMID: 25590698 DOI: 10.1590/0001-37652014864] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Affiliation(s)
- Alexander W A Kellner
- Laboratório de Sistemática e Tafonomia de Vertebrados Fósseis, Departamento de Geologia e Paleontologia do Museu Nacional/UFRJ, Quinta da Boa Vista, Rio de Janeiro, RJ, Brasil
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