Production of a monoclonal antibody against SARS-CoV spike protein with single intrasplenic immunization of plasmid DNA.

Production of a monoclonal antibody against SARS-CoV spike protein with single intrasplenic immunization of plasmid DNA.
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DOI:
10.1016/j.imlet.2005.03.015
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发表时间:
2005-09-15
期刊:
影响因子:
4.4
通讯作者:
Han ZC
Han ZC
中科院分区:
医学3区
文献类型:
--
作者:
Yu XF;Liang LH;She M;Liao XL;Gu J;Li YH;Han ZC

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严重急性呼吸综合征(SARS)是由一种新型冠状病毒(SARS-CoV)引起的高度传染性疾病。抗SARS冠状病毒的特异性单克隆抗体(mAb)对于SARS的早期诊断和病理学研究至关重要。当蛋白质抗原难以制备或使用时有危险时,直接脾内接种编码抗原的质粒DNA是一种快速有效的制备特异性mAb的方法。本研究通过免疫信息学方法,选择SARS-CoV刺突蛋白(S1-3)的一个片段作为抗原决定簇。编码S1-3的质粒DNA的单次脾内免疫诱导抗刺突蛋白抗体。我们建立了一株分泌特异性mAb的杂交瘤细胞株,并用SARS-CoV刺突蛋白假型小鼠白血病病毒(MLV/SARS-CoV)进行了鉴定。该单克隆抗体可以识别MLV/SARS-CoV感染的Vero E6细胞上的刺突蛋白,尽管对假型病毒的感染性没有中和作用。我们的研究结果表明,单次注射脾内DNA免疫是有效的生产针对SARS刺突蛋白的特异性单克隆抗体,并在本研究中识别的刺突蛋白的线性表位。
Severe acute respiratory syndrome (SARS) is a highly infectious disease caused by a novel coronavirus (SARS-CoV). Specific monoclonal antibodies (mAbs) against the SARS-CoV are vital for early diagnosis and pathological studies of SARS. Direct intrasplenic inoculation of plasmid DNA encoding antigen is an effective and fast approach to generate specific mAb when the protein antigen is difficult to prepare or dangerous in use. In this study, we selected one fragment of SARS-CoV spike protein (S1-3) as antigenic determinant by immunoinformatics. Single intrasplenic immunization of plasmid DNA encoding S1-3 induced anti-spike protein antibodies. We established one hybridoma cell line secreting specific mAb and evaluated this mAb with murine leukemia virus pseudotyped with SARS-CoV spike protein (MLV/SARS-CoV). The mAb could recognize the spike protein on the MLV/SARS-CoV-infected Vero E6 cells albeit with no neutralizing effect on the infectivity of the pseudotype virus. Our results show that a single-shot intrasplenic DNA immunization is efficient for the production of specific mAb against SARS spike protein, and a linear epitope of the spike protein is recognized in this study.
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