Construction of Toxoplasma gondii SRS29C nucleic acid vaccine and comparative immunoprotective study of an SRS29C and SAG1 combination

IF 1.4 4区 医学 Q4 BIOCHEMISTRY & MOLECULAR BIOLOGY
An Yan, Jing Tian, Jianjun Ye, Chuanliang Gao, Liying Ye, Dongchao Zhang, Qiqi Song
{"title":"Construction of Toxoplasma gondii SRS29C nucleic acid vaccine and comparative immunoprotective study of an SRS29C and SAG1 combination","authors":"An Yan,&nbsp;Jing Tian,&nbsp;Jianjun Ye,&nbsp;Chuanliang Gao,&nbsp;Liying Ye,&nbsp;Dongchao Zhang,&nbsp;Qiqi Song","doi":"10.1016/j.molbiopara.2024.111630","DOIUrl":null,"url":null,"abstract":"<div><p><em>Toxoplasma gondii</em> is an intracellular protozoan parasite that infects all nucleated cells except the red blood cells. Currently, nucleic acid vaccines are being widely investigated in <em>Toxoplasma gondii</em> control, and several nucleic acid vaccine candidate antigens have shown good protection in various studies. The aim of this study was to construct a nucleic acid vaccine with <em>Toxoplasma gondii</em> SRS29C as the target gene. We explored the nucleic acid vaccine with <em>Toxoplasma</em> surface protein SRS29C and the combined gene of SRS29C and SAG1 and evaluated its immunoprotective effect against <em>Toxoplasma gondii.</em> To amplify the gene fragment and clone it to the expression vector, the recombinant plasmid pEGFP-SRS29C was constructed by PCR. Eukaryotic cells were transfected with the plasmid, and the expression of the target protein was assessed using the Western blot method. The level of serum IgG was determined via ELISA, and the splenic lymphocyte proliferation ability was detected using the CCK-8 method. The percentages of CD4<sup>+</sup> and CD8<sup>+</sup> T cells were measured by flow cytometry. Mice were immunised three times with single-gene nucleic acid vaccine and combination vaccine. Splenic lymphocytokine expression was determined using ELISA kits. The mice's survival time was monitored and recorded during an in vivo insect assault experiment, and the vaccine's protective power was assessed. The outcomes showed that PCR-amplification of an SRS29C gene fragment was successful. The 4,733-bp vector fragment and the 1,119-bp target segment were both recognised by double digestion. Additionally, after transfection of the recombinant plasmid pEGFP-SRS29C, Western blot examination of the extracted protein revealed the presence of a target protein strip at 66 kDa. The test results demonstrated that the IgG content in the serum of the pEGFP-SRS29C group and the co-immunization group was significantly higher than that of the PBS group and the empty vector group. The IgG potency induced by the co-immunization group was higher than that of the pEGFP-SRS29C group and the pEGFP-SAG1 group, the number of splenic lymphocyte proliferation number was higher than that of the PBS group and the empty vector group. The CD4<sup>+</sup>/CD8<sup>+</sup> T ratio was higher than that of the PBS group and the empty vector group. The expression of IFN-γ and TNF-α in the splenocytes of the pEGFP-SRS29C group and the combined immunisation group was significantly higher following antigen stimulation. In the worm attack experiments, mice in the PBS and empty vector groups perished within 9 days of the worm attack, whereas mice in the pEGFP-SRS29C group survived for 18 days, mice in the pEGFP-SAG1 group survived for 21 days, and mice in the co-immunization group survived for 24 days. This demonstrates that the constructed <em>Toxoplasma gondii</em> nucleic acid vaccine pEGFP-SRS29C and the combined gene vaccine can induce mice to develop certain humoral and cellular immune responses, and enhance their ability to resist <em>Toxoplasma gondii</em> infection.</p></div>","PeriodicalId":18721,"journal":{"name":"Molecular and biochemical parasitology","volume":null,"pages":null},"PeriodicalIF":1.4000,"publicationDate":"2024-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Molecular and biochemical parasitology","FirstCategoryId":"3","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0166685124000239","RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"BIOCHEMISTRY & MOLECULAR BIOLOGY","Score":null,"Total":0}
引用次数: 0

Abstract

Toxoplasma gondii is an intracellular protozoan parasite that infects all nucleated cells except the red blood cells. Currently, nucleic acid vaccines are being widely investigated in Toxoplasma gondii control, and several nucleic acid vaccine candidate antigens have shown good protection in various studies. The aim of this study was to construct a nucleic acid vaccine with Toxoplasma gondii SRS29C as the target gene. We explored the nucleic acid vaccine with Toxoplasma surface protein SRS29C and the combined gene of SRS29C and SAG1 and evaluated its immunoprotective effect against Toxoplasma gondii. To amplify the gene fragment and clone it to the expression vector, the recombinant plasmid pEGFP-SRS29C was constructed by PCR. Eukaryotic cells were transfected with the plasmid, and the expression of the target protein was assessed using the Western blot method. The level of serum IgG was determined via ELISA, and the splenic lymphocyte proliferation ability was detected using the CCK-8 method. The percentages of CD4+ and CD8+ T cells were measured by flow cytometry. Mice were immunised three times with single-gene nucleic acid vaccine and combination vaccine. Splenic lymphocytokine expression was determined using ELISA kits. The mice's survival time was monitored and recorded during an in vivo insect assault experiment, and the vaccine's protective power was assessed. The outcomes showed that PCR-amplification of an SRS29C gene fragment was successful. The 4,733-bp vector fragment and the 1,119-bp target segment were both recognised by double digestion. Additionally, after transfection of the recombinant plasmid pEGFP-SRS29C, Western blot examination of the extracted protein revealed the presence of a target protein strip at 66 kDa. The test results demonstrated that the IgG content in the serum of the pEGFP-SRS29C group and the co-immunization group was significantly higher than that of the PBS group and the empty vector group. The IgG potency induced by the co-immunization group was higher than that of the pEGFP-SRS29C group and the pEGFP-SAG1 group, the number of splenic lymphocyte proliferation number was higher than that of the PBS group and the empty vector group. The CD4+/CD8+ T ratio was higher than that of the PBS group and the empty vector group. The expression of IFN-γ and TNF-α in the splenocytes of the pEGFP-SRS29C group and the combined immunisation group was significantly higher following antigen stimulation. In the worm attack experiments, mice in the PBS and empty vector groups perished within 9 days of the worm attack, whereas mice in the pEGFP-SRS29C group survived for 18 days, mice in the pEGFP-SAG1 group survived for 21 days, and mice in the co-immunization group survived for 24 days. This demonstrates that the constructed Toxoplasma gondii nucleic acid vaccine pEGFP-SRS29C and the combined gene vaccine can induce mice to develop certain humoral and cellular immune responses, and enhance their ability to resist Toxoplasma gondii infection.

弓形虫 SRS29C 核酸疫苗的构建以及 SRS29C 和 SAG1 组合的免疫保护比较研究
弓形虫是一种细胞内原生寄生虫,可感染除红细胞以外的所有有核细胞。目前,核酸疫苗在弓形虫防治方面正得到广泛研究,一些核酸疫苗候选抗原在各种研究中显示出良好的保护作用。本研究旨在构建以弓形虫 SRS29C 为靶基因的核酸疫苗。我们探索了带有弓形虫表面蛋白 SRS29C 和 SRS29C 与 SAG1 组合基因的核酸疫苗,并评估了其对弓形虫的免疫保护效果。为了扩增基因片段并将其克隆到表达载体上,利用 PCR 技术构建了重组质粒 pEGFP-SRS29C。用质粒转染真核细胞,并用 Western 印迹法评估目标蛋白的表达。血清 IgG 水平通过 ELISA 法测定,脾脏淋巴细胞增殖能力通过 CCK-8 法检测。CD4+ 和 CD8+ T 细胞的百分比通过流式细胞术测定。用单基因核酸疫苗和联合疫苗免疫小鼠三次。使用 ELISA 试剂盒测定脾脏淋巴细胞介素的表达。在体内昆虫攻击实验中监测和记录了小鼠的存活时间,并评估了疫苗的保护力。结果表明,SRS29C 基因片段的 PCR 扩增是成功的。4733-bp的载体片段和1119-bp的目标片段都通过双重消化得到了识别。此外,在转染重组质粒 pEGFP-SRS29C 后,对提取的蛋白质进行 Western 印迹检测,发现存在 66 kDa 的目标蛋白条带。检测结果表明,pEGFP-SRS29C 组和联合免疫组血清中的 IgG 含量明显高于 PBS 组和空载体组。共免疫组诱导的 IgG 效价高于 pEGFP-SRS29C 组和 pEGFP-SAG1 组,脾脏淋巴细胞增殖数高于 PBS 组和空载体组。CD4+/CD8+ T 比率高于 PBS 组和空载体组。抗原刺激后,pEGFP-SRS29C 组和联合免疫组脾脏细胞中 IFN-γ 和 TNF-α 的表达量明显增加。在蠕虫攻击实验中,PBS组和空载体组小鼠在蠕虫攻击后9天内死亡,而pEGFP-SRS29C组小鼠存活18天,pEGFP-SAG1组小鼠存活21天,联合免疫组小鼠存活24天。这表明构建的弓形虫核酸疫苗pEGFP-SRS29C和联合基因疫苗能诱导小鼠产生一定的体液免疫和细胞免疫反应,增强小鼠抵抗弓形虫感染的能力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
CiteScore
2.90
自引率
0.00%
发文量
51
审稿时长
63 days
期刊介绍: The journal provides a medium for rapid publication of investigations of the molecular biology and biochemistry of parasitic protozoa and helminths and their interactions with both the definitive and intermediate host. The main subject areas covered are: • the structure, biosynthesis, degradation, properties and function of DNA, RNA, proteins, lipids, carbohydrates and small molecular-weight substances • intermediary metabolism and bioenergetics • drug target characterization and the mode of action of antiparasitic drugs • molecular and biochemical aspects of membrane structure and function • host-parasite relationships that focus on the parasite, particularly as related to specific parasite molecules. • analysis of genes and genome structure, function and expression • analysis of variation in parasite populations relevant to genetic exchange, pathogenesis, drug and vaccine target characterization, and drug resistance. • parasite protein trafficking, organelle biogenesis, and cellular structure especially with reference to the roles of specific molecules • parasite programmed cell death, development, and cell division at the molecular level.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信