Article(id=1241451302648082915, tenantId=1146029695717560320, journalId=1192105938417971205, issueId=1241451293068284204, articleNumber=null, orderNo=null, doi=10.13343/j.cnki.wsxb.20240041, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=1705161600000, receivedDateStr=2024-01-14, revisedDate=null, revisedDateStr=null, acceptedDate=1713715200000, acceptedDateStr=2024-04-22, onlineDate=1773914655601, onlineDateStr=2026-03-19, pubDate=1713974400000, pubDateStr=2024-04-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1773914655601, onlineIssueDateStr=2026-03-19, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1773914655601, creator=13701087609, updateTime=1773914655601, updator=13701087609, issue=Issue{id=1241451293068284204, tenantId=1146029695717560320, journalId=1192105938417971205, year='2024', volume='64', issue='8', pageStart='2591', pageEnd='3085', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1773914653317, creator=13701087609, updateTime=1773919071204, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1241469823079731774, tenantId=1146029695717560320, journalId=1192105938417971205, issueId=1241451293068284204, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1241469823079731775, tenantId=1146029695717560320, journalId=1192105938417971205, issueId=1241451293068284204, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=2799, endPage=2812, ext={EN=ArticleExt(id=1241451303084290546, articleId=1241451302648082915, tenantId=1146029695717560320, journalId=1192105938417971205, language=EN, title=Expression and immunogenicity of S protein with two proline residue mutations of porcine deltacoronavirus, columnId=1241045257748533520, journalTitle=Acta Microbiologica Sinica, columnName=Research Articles, runingTitle=null, highlight=null, articleAbstract=
[Objective] Porcine deltacoronavirus (PDCoV) is a major porcine enteric coronavirus, causing huge economic losses to the pig breeding industry worldwide. However, there is no commercial vaccine available for this virus. The spike (S) protein is a key factor inducing host immune response. In this study, the two sites 855 and 856 in the loop between the heptapeptide repeat-1 (HR1) and the central helix of PDCoV S protein were mutated to proline (E855P and V856P). Then, the recombinant S protein and mutated S protein (S2P) were expressed and purified by the ExpiCHO-S eukaryotic expression system, and their immunogenicity and immunoprotecive performance were evaluated for developing a PDCoV subunit vaccine with good immune effect. [Methods] The serum level of the specific antibody IgG in immunized mice was measured by indirect enzyme-linked immunosorbent assay. The serum neutralization test was carried out to determine the titer of neutralizing antibodies in the immunized mice. The proliferation of T lymphocytes in immunized mice was detected by flow cytometry. The secretion levels of interferon (IFN)-γ, IFN-α, interleukin (IL)-2, and IL-4 were determined. RT-qPCR was employed to measure the PDCoV load in the intestinal tissue of mice after challenge. Tissue sections were prepared to observe the intestinal lesions of mice. The distribution of PDCoV antigen in the intestinal tissue of mice was detected by immunohistochemistry. [Results] High levels of anti-PDCoV specific IgG antibodies were produced in mice after intramuscular injection of S and S2P subunit vaccines, and the serum of mice 42 days after immunization had a neutralizing effect on PDCoV. The 50% neutralizing protective titer of LLC-PK cells in the S2P group was significantly higher than that in the S group. In addition, the immunization with S and S2P significantly induced the proliferation of CD4+ T lymphocytes in mice, which was higher in the S2P group than in the S group. The immunization with S2P induced the proliferation of CD8+ T lymphocytes in mice, and the level of CD8+ T lymphocytes showed no difference between the S group and the PBS group. The levels of IFN-γ, IFN-α, IL-2, and IL-4 in the S and S2P groups were significantly higher than those in the PBS group and had no difference between the S and S2P groups. The challenge assay results showed that the PBS group presented PDCoV, pathological damage, and a large number of PDCoV antigens in the intestinal tissue, while neither PDCoV nor intestinal tissue damage was detected in the S and S2P groups, which showed no significant difference between the two groups. [Conclusion] S2P induces higher level of the humoral immune response against PDCoV in mice than S. The vaccines prepared with both S2P and S have protective effects on mice. The findings lays a foundation for the follow-up study of PDCoV subunit vaccines.
, correspAuthors=Xia LIU, Xinsheng LIU, authorNote=null, correspAuthorsNote=
, copyrightStatement=Copyright ©2024 Acta Microbiologica Sinica. All rights reserved., copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, authorCompany=null, fund=null, authors=null, authorsList=Yuhan WEN, Ruiming YU, Liping ZHANG, Xiaohua DU, Li PAN, Yonglu WANG, Huichen GUO, Xia LIU, Xinsheng LIU), CN=ArticleExt(id=1241451307261817510, articleId=1241451302648082915, tenantId=1146029695717560320, journalId=1192105938417971205, language=CN, title=猪德尔塔冠状病毒双脯氨酸突变S蛋白的表达及免疫原性评价, columnId=1192149544164012138, journalTitle=微生物学报, columnName=研究报告, runingTitle=null, highlight=null, articleAbstract=
【目的】猪德尔塔冠状病毒(porcine deltacoronavirus, PDCoV)是一种重要的猪肠道冠状病毒,给全球生猪养殖业带来了巨大的经济损失,截至目前,尚无可用的商品化疫苗。本研究选择宿主免疫反应主要诱因因子棘突(spike, S)蛋白,并将PDCoV S蛋白七肽重复序列1 (heptapeptide repeat-1, HR1)与中心螺旋之间的环中855和856位点均突变为双脯氨酸(E855P和V856P),然后利用ExpiCHO-S真核表达系统表达、纯化重组S蛋白和双脯氨酸突变S蛋白(S2P)并评价其免疫原性及免疫保护性,以初步研制一种免疫效果较好的PDCoV亚单位疫苗。【方法】利用间接酶联免疫吸附法检测免疫小鼠血清特异性抗体IgG水平;利用血清中和试验检测免疫小鼠血清中和抗体滴度;通过流式细胞术检测免疫小鼠T淋巴细胞增殖情况;通过细胞因子检测免疫小鼠干扰素(interferon, IFN)-γ、IFN-α、白细胞介素(interleukin, IL)-2和IL-4等细胞因子分泌情况;采用RT-qPCR检测攻毒后小鼠肠道组织PDCoV病毒载量;采用病理组织切片检测小鼠肠道有无病理损伤;利用免疫组织化学检测小鼠肠道组织PDCoV抗原分布情况。【结果】免疫原性结果显示,小鼠在肌肉注射S组和S2P组亚单位疫苗后能够产生较高水平的抗PDCoV特异性IgG抗体,免疫后42 d的小鼠血清均对PDCoV具有中和作用,其中,S2P组对LLC-PK细胞50%中和保护效价显著高于S组。此外,S组和S2P组显著地诱导小鼠CD4+ T淋巴细胞增殖,并且S2P组高于S组,而S2P组能够诱导小鼠CD8+ T淋巴细胞增殖,但S组与PBS组并无差异。同时,S组和S2P组诱导的IFN-γ、IFN-α、IL-2和IL-4等细胞因子水平均显著高于PBS组,但S组和S2P组并无差异。免疫保护性结果显示,PBS组肠组织中可检测到PDCoV病毒,肠组织出现病理损伤且可见大量PDCoV抗原,而S组和S2P组未检测到PDCoV病毒且未观察到肠组织损伤,二者之间无明显差异。【结论】S2P组较之S组能够诱导小鼠产生更高水平的抗PDCoV体液免疫应答,两组疫苗对小鼠均有一定的保护效果,本研究为后续PDCoV亚单位疫苗研发奠定坚实的基础。
, correspAuthors=刘霞, 刘新生, authorNote=null, correspAuthorsNote=null, copyrightStatement=版权所有©《微生物学报》编辑部2024, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=X8NOOH2KDtgT5Na44zXTXg==, magXml=8dr4xtSCCBod+IzbZFoHdg==, pdfUrl=null, pdf=SWtRtNR7bDw4V9P19+99QA==, pdfFileSize=855667, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=pYgj0Kk7ubgybcwan4+Wzg==, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=QJcHFLVfkQbht8oZIDZZ+g==, mapNumber=null, authorCompany=null, fund=null, authors=null, authorsList=文玉涵, 于瑞明, 张莉萍, 杜晓华, 潘丽, 王永录, 郭慧琛, 刘霞, 刘新生)}, authors=[Author(id=1242193060570956706, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241451302648082915, orderNo=0, firstName=null, middleName=null, lastName=null, nameCn=null, orcid=null, stid=null, country=null, authorPic=null, dead=0, email=null, emailSecond=null, emailThird=null, correspondingAuthor=0, authorType=1, ext={EN=AuthorExt(id=1242193060688397233, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241451302648082915, authorId=1242193060570956706, language=EN, stringName=Yuhan WEN, firstName=Yuhan, middleName=null, lastName=WEN, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
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2, address=2 State Key Laboratory for Animal Disease Control and Prevention, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, Gansu, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1242193061573394455, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241451302648082915, authorId=1242193061296571385, language=CN, stringName=张莉萍, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
2, address=2 中国农业科学院兰州兽医研究所 动物疫病防控全国重点实验室, 甘肃 兰州 730046, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null)}, companyList=[AuthorCompany(id=1242193060449321875, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241451302648082915, xref=null, ext=[AuthorCompanyExt(id=1242193060457710485, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241451302648082915, companyId=1242193060449321875, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=2 State Key Laboratory for Animal Disease Control and Prevention, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, Gansu, China), AuthorCompanyExt(id=1242193060461904791, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241451302648082915, companyId=1242193060449321875, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=2 中国农业科学院兰州兽医研究所 动物疫病防控全国重点实验室, 甘肃 兰州 730046)])]), Author(id=1242193061736972332, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241451302648082915, orderNo=3, firstName=null, middleName=null, lastName=null, nameCn=null, orcid=null, stid=null, country=null, authorPic=null, dead=0, email=null, emailSecond=null, emailThird=null, correspondingAuthor=0, authorType=1, ext={EN=AuthorExt(id=1242193061900550195, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241451302648082915, authorId=1242193061736972332, language=EN, stringName=Xiaohua DU, firstName=Xiaohua, middleName=null, lastName=DU, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
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Double proline mutation and double digestion identification of S-pcDNA3.1(+) recombinant plasmid. A: Double proline mutation of S-pcDNA3.1(+) recombinant plasmid. B: Double digestion of recombinant plasmid S-pcDNA3.1(+). M: DNA marker; 1: Double digestion of S-pcDNA3.1(+) recombinant plasmid. C: Double digestion of recombinant plasmid S2P-pcDNA3.1(+). M: DNA marker; 1: Double digestion of S2P-pcDNA3.1(+) recombinant plasmid., figureFileSmall=CIhfvEDGxwE5OCFVrFTI/Q==, figureFileBig=NCCfkdwuq+XWUd4InJclYw==, tableContent=null), ArticleFig(id=1242193065788670314, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241451302648082915, language=CN, label=图1, caption=
S-pcDNA3.1(+)重组质粒双脯氨酸突变及双酶切鉴定, figureFileSmall=CIhfvEDGxwE5OCFVrFTI/Q==, figureFileBig=NCCfkdwuq+XWUd4InJclYw==, tableContent=null), ArticleFig(id=1242193065918693750, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241451302648082915, language=EN, label=Figure 2, caption=
Expression and purification of S and S2P recombinant proteins in ExpiCHO-S cells. A: Recombinant S protein was expressed in ExpiCHO-S cells. M: Protein marker; 1: Expression of recombinant S protein. B: Recombinant S2P protein was expressed in ExpiCHO-S cells. M: Protein marker; 1: Expression of recombinant S2P protein. C: Ni-NTA Agarose was used to purify recombinant S protein. M: Protein marker; 1: 20 mmol/L imidazole elution; 2−5: 500 mmol/L imidazole elution. D: Ni-NTA Agarose was used to purify recombinant S2P protein. M: Protein marker; 1: 20 mmol/L imidazole elution; 2−5: 500 mmol/L imidazole elution., figureFileSmall=MQzl39i9aO89PHWpEPyfaQ==, figureFileBig=enCuEmQLjDF/pDDYYlelhw==, tableContent=null), ArticleFig(id=1242193066069688702, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241451302648082915, language=CN, label=图2, caption=
S和S2P重组蛋白在ExpiCHO-S细胞表达及纯化, figureFileSmall=MQzl39i9aO89PHWpEPyfaQ==, figureFileBig=enCuEmQLjDF/pDDYYlelhw==, tableContent=null), ArticleFig(id=1242193066191323527, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241451302648082915, language=EN, label=Figure 3, caption=
Detection of serum specific antibody IgG by indirect ELISA., figureFileSmall=cUZVCLbqCW3EB3bHiyTu5g==, figureFileBig=Abcq7lYWUySOZatyZkg67w==, tableContent=null), ArticleFig(id=1242193066359095703, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241451302648082915, language=CN, label=图3, caption=
间接ELISA检测血清特异性抗体IgG, figureFileSmall=cUZVCLbqCW3EB3bHiyTu5g==, figureFileBig=Abcq7lYWUySOZatyZkg67w==, tableContent=null), ArticleFig(id=1242193066480730529, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241451302648082915, language=EN, label=Figure 4, caption=
Titer of serum anti-PDCoV neutralizing antibody. **: P < 0.01; ***: P < 0.001., figureFileSmall=5SwMZ8TuD/McS0jK7GP08w==, figureFileBig=Mr2lOcU0RfOjwSlcbKyfLA==, tableContent=null), ArticleFig(id=1242193066606559660, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241451302648082915, language=CN, label=图4, caption=
血清抗PDCoV中和抗体效价, figureFileSmall=5SwMZ8TuD/McS0jK7GP08w==, figureFileBig=Mr2lOcU0RfOjwSlcbKyfLA==, tableContent=null), ArticleFig(id=1242193066740777398, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241451302648082915, language=EN, label=Figure 5, caption=
Spleen lymphocytes were detected by flow cytometry. A: Flow cytometry was used to determine the types of spleen T lymphocytes. B: CD3+/CD4+/CD8+ typing of spleen T lymphocytes. ns: P > 0.05; *: P < 0.05; **: P < 0.01; ***: P < 0.001., figureFileSmall=Hv8YTOVp5iR/Y9solAN7PA==, figureFileBig=9iah6O4PK8KX8yS2llmP6g==, tableContent=null), ArticleFig(id=1242193066866606529, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241451302648082915, language=CN, label=图5, caption=
流式细胞术检测脾淋巴细胞, figureFileSmall=Hv8YTOVp5iR/Y9solAN7PA==, figureFileBig=9iah6O4PK8KX8yS2llmP6g==, tableContent=null), ArticleFig(id=1242193066988241354, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241451302648082915, language=EN, label=Figure 6, caption=
Cytokine levels were measured. A: IFN-α levels. B: IFN-γ levels. C: IL-2 levels. D IL-4 levels. ns: P > 0.05; **: P < 0.01; ***: P < 0.001., figureFileSmall=rVI8D5B+qzAxhCzVreRuNw==, figureFileBig=UtPOq2KeYntMnhT4Mw1Uyw==, tableContent=null), ArticleFig(id=1242193067101487571, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241451302648082915, language=CN, label=图6, caption=
细胞因子水平测定, figureFileSmall=rVI8D5B+qzAxhCzVreRuNw==, figureFileBig=UtPOq2KeYntMnhT4Mw1Uyw==, tableContent=null), ArticleFig(id=1242193067218928089, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241451302648082915, language=EN, label=Figure 7, caption=
Histopathological and immunohistochemistry analyses. HE: Histomorphology; IHC: immunohistochemistry., figureFileSmall=fH2+Zmjku7clp/+QqWvmSw==, figureFileBig=M6eKm1zigdVmL9HPqahNWQ==, tableContent=null), ArticleFig(id=1242193067332174306, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241451302648082915, language=CN, label=图7, caption=
组织病理切片和免疫组织化学, figureFileSmall=fH2+Zmjku7clp/+QqWvmSw==, figureFileBig=M6eKm1zigdVmL9HPqahNWQ==, tableContent=null), ArticleFig(id=1242193067441226216, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241451302648082915, language=EN, label=Table 1, caption=
Immunity and blood collection of mice
, figureFileSmall=null, figureFileBig=null, tableContent=
| Group | Immunogenic antigen | Dose (μg) | Immune time (d) | Blood collection time (d) |
| − is PBS instead of antigen immunization dose. |
| G1 | PBS | − | 0, 14, 28 | 14, 28, 42 |
| G2 | S | 10 | 0, 14, 28 | 14, 28, 42 |
| G3 | S2P | 10 | 0, 14, 28 | 14, 28, 42 |
), ArticleFig(id=1242193067529306603, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241451302648082915, language=CN, label=表1, caption=
小鼠免疫及采血情况
, figureFileSmall=null, figureFileBig=null, tableContent=
| Group | Immunogenic antigen | Dose (μg) | Immune time (d) | Blood collection time (d) |
| − is PBS instead of antigen immunization dose. |
| G1 | PBS | − | 0, 14, 28 | 14, 28, 42 |
| G2 | S | 10 | 0, 14, 28 | 14, 28, 42 |
| G3 | S2P | 10 | 0, 14, 28 | 14, 28, 42 |
), ArticleFig(id=1242193067646747120, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241451302648082915, language=EN, label=Table 2, caption=
Ct values of mouse intestinal tissue
, figureFileSmall=null, figureFileBig=null, tableContent=
| Group | The first | | The second | | The third |
| Ct-1 | Ct-2 | Ct-1 | Ct-2 | Ct-1 | Ct-2 |
| Ct value > 30 is considered negative or below the detection limit of RT-qPCR, while Ct value≤30 is considered positive for PDCoV[28]. |
| PBS | 28.12 | 28.48 | | 28.78 | 28.55 | | 29.48 | 29.86 |
| S | 31.88 | 31.56 | 31.79 | 31.42 | 32.18 | 31.54 |
| S2P | 32.87 | 33.69 | 31.90 | 32.59 | 33.69 | 31.70 |
), ArticleFig(id=1242193067755799031, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241451302648082915, language=CN, label=表2, caption=
小鼠肠组织Ct值
, figureFileSmall=null, figureFileBig=null, tableContent=
| Group | The first | | The second | | The third |
| Ct-1 | Ct-2 | Ct-1 | Ct-2 | Ct-1 | Ct-2 |
| Ct value > 30 is considered negative or below the detection limit of RT-qPCR, while Ct value≤30 is considered positive for PDCoV[28]. |
| PBS | 28.12 | 28.48 | | 28.78 | 28.55 | | 29.48 | 29.86 |
| S | 31.88 | 31.56 | 31.79 | 31.42 | 32.18 | 31.54 |
| S2P | 32.87 | 33.69 | 31.90 | 32.59 | 33.69 | 31.70 |
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