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Coronavirus immunogens

Linda J Saif1,∗
1Food Animal Health Research Program, Ohio Agricultural Research and Development Center, The Ohio State University, Wooster, OHUSA
∗

Correspondence to: L.J. Saif, Food Animal Health Research Program, Ohio Agricultural Research and Development Center, The Ohio State University, Wooster, OH 44691, USA.

Accepted 1993 Jul 14; Issue date 1993 Nov.

Copyright © 1993 Published by Elsevier B.V.

Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.

PMCID: PMC7117163  PMID:8116187

Abstract

Coronaviruses (CV) infect a variety of livestock, poultry and companion animals. They belong to at least five antigenic groups. CV cause localized infections of the respiratory and/or intestinal tracts, with the exception of feline infectious peritonitis virus (FIVP) and hemagglutinating encephalomyelitis (HEV) which cause systemic infections. The enteropathogenic CV infect the villous enterocytes resulting in villous atrophy leading to malabsorptive diarrhea. Several CV (bovine CV-BCV, porcine respiratory CV-PRCV, infectious bronchitis virus-IBV) cause respiratory disease.

Current evidence indicates that protection against enteric and respiratory CV infections is mediated by passive or active immunity at the primary site of CV replication. Maternal vaccination approaches to induce passive immunity include the use of inactivated and modified live viral vaccines. Modified live viruses and a Ts mutant CV (FIPV) are also used as oral or intranasal vaccines to induce active mucosal immunity. The success of these vaccines in the field is often compromised by a number of potential problems.

Coronaviruses are spherical, enveloped viruses, ranging from 80–160 nm in diameter and containing a positive-stranded RNA genome. They possess prominent surface spikes and some species display a fringe of smaller surface projections believed to be the hemagglutinin (HE). Coronaviruses possess 3 to 4 structural proteins: the spike (S) glycoprotein (150–200 kDa), the integral membrane glycoprotein (M; 20–30 kDa) and the nucleocapsid phosphoprotein (N; 43–50 kDa). A subset of CV (BCV, HEV, turkey CV) possess a third glycoprotein on the virion surface, the HE (60–65 kDa). These proteins can be quantitated using pooled monoclonal antibodies (mAb) to distinct epitopes of each protein in ELISA.

Most research has focused on the S protein as a candidate antigen for CV vaccines since it induces virus neutralizing (VN) antibodies. However the HE protein stimulates the production of VN and HE inhibiting antibodies and the M protein induces antibodies that neutralize virus in the presence of complement. Attempts to correlate in vitro VN antibody activity with in vivo protection have shown that the passive transfer of VN mAb to the S or HE protein conferred passive protection against CV challenge in some studies, but not others. Additional research has implicated a possible role for other CV proteins in immunity. Studies of mAb to the M protein of transmissible gastroenteritis (TGEV) have provided evidence for a direct role of the M protein in the induction of αIFN by porcine blood leukocytes. The potential significance of this phenomenon to immunity to TGEV is unclear. Similarly, studies of IBV have suggested that determinants recognized by T cells reside on the N protein and these determinants may be shared among heterologous strains of IBV, resulting in the induction of cross-protection. Thus epitopes on the N protein may be important for induction of cell mediated immunity (CMI). CMI may play an important role in protection of cats against FIPV, since induction of circulating antibodies to the S protein of FIPV contributes to disease pathogenesis by the induction of immune complexes and antibody dependent enhancement of the infectivity of FIPV for macrophages.

An increased understanding of antibody and CMI responses following natural CV infections in animals is needed to identify the antigens and epitopes that induce protective immune responses. The expression of CV structural protein genes in various vectors will provide the recombinant proteins needed for future immunogenicity studies in the host species. Furthermore, live rDNA vectors that replicate in the gut and express coronavirus genes may provide a new generation of coronavirus vaccines.

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