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Journal of Virology, May 2004, p. 4638-4645, Vol. 78, No. 9
0022-538X/04/$08.00+0     DOI: 10.1128/JVI.78.9.4638-4645.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Generation and Characterization of DNA Vaccines Targeting the Nucleocapsid Protein of Severe Acute Respiratory Syndrome Coronavirus

Tae Woo Kim,1 Jin Hyup Lee,1 Chien-Fu Hung,1 Shiwen Peng,1 Richard Roden,1,2 Mei-Cheng Wang,3 Raphael Viscidi,4 Ya-Chea Tsai,1 Liangmei He,1 Pei-Jer Chen,5,6 David A. K. Boyd,1 and T.-C. Wu1,2,7,8*

Departments of Pathology,1 Pediatrics,4 Oncology,7 Biostatistics,3 Obstetrics and Gynecology,2 Molecular Microbiology and Immunology, The Johns Hopkins Medical Institutions, Baltimore, Maryland 21205,8 Graduate Institute of Clinical Medicine,5 Hepatitis Research Center, National Taiwan University Hospital, College of Medicine, National Taiwan University, Taipei, Taiwan6

Received 17 October 2003/ Accepted 22 December 2003

Severe acute respiratory syndrome (SARS) is a serious threat to public health and the economy on a global scale. The SARS coronavirus (SARS-CoV) has been identified as the etiological agent for SARS. Thus, vaccination against SARS-CoV may represent an effective approach to controlling SARS. DNA vaccines are an attractive approach for SARS vaccine development, as they offer many advantages over conventional vaccines, including stability, simplicity, and safety. Our investigators have previously shown that DNA vaccination with antigen linked to calreticulin (CRT) dramatically enhances major histocompatibility complex class I presentation of linked antigen to CD8+ T cells. In this study, we have employed this CRT-based enhancement strategy to create effective DNA vaccines using SARS-CoV nucleocapsid (N) protein as a target antigen. Vaccination with naked CRT/N DNA generated the most potent N-specific humoral and T-cell-mediated immune responses in vaccinated C57BL/6 mice among all of the DNA constructs tested. Furthermore, mice vaccinated with CRT/N DNA were capable of significantly reducing the titer of challenging vaccinia virus expressing the N protein of the SARS virus. These results show that a DNA vaccine encoding CRT linked to a SARS-CoV antigen is capable of generating strong N-specific humoral and cellular immunity and may potentially be useful for control of infection with SARS-CoV.

* Corresponding author. Mailing address: Department of Pathology, The Johns Hopkins University School of Medicine, Ross 512H, 720 Rutland Ave., Baltimore, MD 21205. Phone: (410) 614-3899. Fax: (443) 287-4295. E-mail: wutc{at}jhmi.edu.

Journal of Virology, May 2004, p. 4638-4645, Vol. 78, No. 9
0022-538X/04/$08.00+0     DOI: 10.1128/JVI.78.9.4638-4645.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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