title: Production of a monoclonal antibody against SARS-CoV spike protein with single intrasplenic immunization of plasmid DNA.
abstract: 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.
authors.affiliation: State Key Laboratory of Experimental Hematology, Institute of Hematology, Chinese Academy of Medical Sciences & Peking Union Medical College, 288 Nanjing Road, Tianjin 300020, PR China.
authors.forename: Xiao Fei
authors.initials: XF
authors.lastname: Yu
authors.forename: Lin Hui
authors.initials: LH
authors.lastname: Liang
authors.forename: Ming
authors.initials: M
authors.lastname: She
authors.forename: Xiao Long
authors.initials: XL
authors.lastname: Liao
authors.forename: Jie
authors.initials: J
authors.lastname: Gu
authors.forename: Yan Han
authors.initials: YH
authors.lastname: Li
authors.forename: Zhong Chao
authors.initials: ZC
authors.lastname: Han
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000096:biosynthesis* / Q000276:immunology; D000918:Antibody Specificity; D045744:Cell Line, Tumor; D002522:Chlorocebus aethiops; D006825:Hybridomas / Q000166:cytology / Q000378:metabolism*; D007114:Immunization; D008297:Male; D008562:Membrane Glycoproteins / Q000235:genetics / Q000276:immunology*; D051379:Mice; D010957:Plasmids; D045473:Severe acute respiratory syndrome-related coronavirus / Q000276:immunology*; D064370:Spike Glycoprotein, Coronavirus; D013154:Spleen / Q000166:cytology / Q000276:immunology; D014162:Transfection; D019444:Vaccines, DNA / Q000008:administration & dosage / Q000235:genetics / Q000276:immunology*; D014709:Vero Cells / Q000821:virology; D014759:Viral Envelope Proteins / Q000235:genetics / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D008562:Membrane Glycoproteins; D064370:Spike Glycoprotein, Coronavirus; D019444:Vaccines, DNA; D014759:Viral Envelope Proteins