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Journal of Virology, September 2001, p. 8434-8439, Vol. 75, No. 18
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.18.8434-8439.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Chimeric Plant Virus Particles as Immunogens for Inducing Murine and Human Immune Responses against Human Immunodeficiency Virus Type 1

Carla Marusic,1 Paola Rizza,2 Laura Lattanzi,2 Camillo Mancini,1 Massimo Spada,2 Filippo Belardelli,2 Eugenio Benvenuto,1,* and Imerio Capone2,*

Divisione Biotecnologie e Agricoltura, ENEA, 00060 Rome,1 and Laboratorio di Virologia, Istituto Superiore di Sanità, 00161 Rome,2 Italy

Received 23 April 2001/Accepted 12 June 2001

The high-yield expression of a neutralizing epitope from human immunodeficiency virus type 1 (HIV-1) on the surface of a plant virus and its immunogenicity are presented. The highly conserved ELDKWA epitope from glycoprotein (gp) 41 was expressed as an N-terminal translational fusion with the potato virus X (PVX) coat protein. The resulting chimeric virus particles (CVPs), purified and used to immunize mice intraperitoneally or intranasally, were able to elicit high levels of HIV-1-specific immunoglobulin G (IgG) and IgA antibodies. Furthermore, the human immune response to CVPs was studied with severe combined immunodeficient mice reconstituted with human peripheral blood lymphocytes (hu-PBL-SCID). hu-PBL-SCID mice immunized with CVP-pulsed autologous dendritic cells were able to mount a specific human primary antibody response against the gp41-derived epitope. Notably, sera from both normal and hu-PBL-SCID mice showed an anti-HIV-1-neutralizing activity. Thus, PVX-based CVPs carrying neutralizing epitopes can offer novel perspectives for the development of effective vaccines against HIV and, more generally, for the design of new vaccination strategies in humans.

* Corresponding author. Mailing address for Eugenio Benvenuto: ENEA, Divisione Biotecnologie e Agricoltura, C.R. Casaccia, 00060 Rome, Italy. Phone: 39-06-30486347. Fax: 39-06-30484741. E-mail: benvenutoe{at}casaccia.enea.it. Mailing address for Imerio Capone: Istituto Superiore di Sanità, Laboratorio di Virologia, 00161 Rome, Italy. Phone: 39-6-49903294. Fax: 39-6-49902097. E-mail: capone{at}iss.it.

Journal of Virology, September 2001, p. 8434-8439, Vol. 75, No. 18
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.18.8434-8439.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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