title: A 219-mer CHO-expressing receptor-binding domain of SARS-CoV S protein induces potent immune responses and protective immunity.
abstract: Development of vaccines is essential for the prevention of future recurrences of severe acute respiratory syndrome (SARS), caused by the SARS coronavirus (SARS-CoV). The spike (S) protein, especially receptor-binding domain (RBD) of SARS-CoV, plays important roles in the prevention of SARS infection, and is thus an important component in SARS vaccine development. In this study, we expressed a 219-mer (residues 318-536) RBD protein in Chinese hamster ovary (CHO)-K1 cells (RBD219-CHO), and tested its immune responses and protective immunity in a mouse model. The results showed that this recombinant protein was correctly folded, being able to maintain intact conformation and authentic antigenicity. It could induce strong humoral and cellular immune responses and high titers of neutralizing antibodies in the vaccinated mice. RBD219-CHO protein elicited potent protective immunity that protected all vaccinated mice from SARS-CoV challenge. These results suggest that the recombinant RBD219-CHO protein has great potential for the development of an effective and safe SARS subunit vaccine.
authors.affiliation: Lindsley F. Kimball Research Institute, New York Blood Center, New York, New York 10065, USA.
authors.forename: Lanying
authors.initials: L
authors.lastname: Du
authors.forename: Guangyu
authors.initials: G
authors.lastname: Zhao
authors.forename: Chris C S
authors.initials: CC
authors.lastname: Chan
authors.forename: Lin
authors.initials: L
authors.lastname: Li
authors.forename: Yuxian
authors.initials: Y
authors.lastname: He
authors.forename: Yusen
authors.initials: Y
authors.lastname: Zhou
authors.forename: Bo-Jian
authors.initials: BJ
authors.lastname: Zheng
authors.forename: Shibo
authors.initials: S
authors.lastname: Jiang
mesh_terms: D000818:Animals; D057134:Antibodies, Neutralizing / Q000097:blood / Q000276:immunology; D000914:Antibodies, Viral / Q000097:blood / Q000276:immunology; D000918:Antibody Specificity; D016466:CHO Cells; D006224:Cricetinae; D003412:Cricetulus; D005260:Female; D007279:Injections, Subcutaneous; D008562:Membrane Glycoproteins / Q000737:chemistry / Q000276:immunology*; D051379:Mice; D008807:Mice, Inbred BALB C; D017434:Protein Structure, Tertiary; D011991:Receptors, Virus / Q000378:metabolism*; D045473:Severe acute respiratory syndrome-related coronavirus / Q000276:immunology*; D045169:Severe Acute Respiratory Syndrome / Q000276:immunology / Q000517:prevention & control*; D064370:Spike Glycoprotein, Coronavirus; D014614:Vaccines, Synthetic / Q000008:administration & dosage / Q000276:immunology; D014759:Viral Envelope Proteins / Q000737:chemistry / Q000276:immunology*; D014765:Viral Vaccines / Q000008:administration & dosage / Q000276:immunology*
chemical_list: D057134:Antibodies, Neutralizing; D000914:Antibodies, Viral; D008562:Membrane Glycoproteins; D011991:Receptors, Virus; D064370:Spike Glycoprotein, Coronavirus; D014614:Vaccines, Synthetic; D014759:Viral Envelope Proteins; D014765:Viral Vaccines; C578557:spike glycoprotein, SARS-CoV; C578553:spike protein, mouse hepatitis virus