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Infection and Immunity, January 2000, p. 247-256, Vol. 68, No. 1
0019-9567/0/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Delivery of CD8+ T-Cell Epitopes into Major Histocompatibility Complex Class I Antigen Presentation Pathway by Bordetella pertussis Adenylate Cyclase: Delineation of Cell Invasive Structures and Permissive Insertion Sites

Radim Osicka,1 Adriana Osicková,1 Tümay Basar,1 Pierre Guermonprez,2 Marie Rojas,2 Claude Leclerc,2 and Peter Sebo1,*

Cellular and Molecular Microbiology Division, Institute of Microbiology of the Academy of Sciences of the Czech Republic, CZ-142 20 Prague 4, Czech Republic,1 and Unité de Biologie des Régulations Immunitaires, Institut Pasteur, 75724 Paris, France2

Received 26 July 1999/Returned for modification 2 September 1999/Accepted 19 October 1999

Bordetella pertussis adenylate cyclase (AC) toxin-hemolysin (ACT-Hly) can penetrate a variety of eukaryotic cells. Recombinant AC toxoids have therefore been recently used for delivery of CD8+ T-cell epitopes into antigen-presenting cells in vivo and for induction of protective antiviral, as well as therapeutic antitumor cytotoxic T-cell responses. We have explored the carrier potential of the ACT molecule by insertional mutagenesis scanning for new permissive sites, at which integration of two- to nine-residue-long peptides does not interfere with membrane interaction and translocation of ACT. A model CD8+ T-cell epitope of ovalbumin was incorporated at 10 of these permissive sites along the toxin molecule, and the capacity of ACT constructs to penetrate into cell cytosol and deliver the epitope into the major histocompatibility complex (MHC) class I antigen processing and presentation pathway was examined. While all six constructs bearing the epitope within the Hly portion of ACT failed to deliver the epitope to the MHC class I molecules, all four toxoids with inserts within different permissive sites in the AC domain efficiently delivered the epitope into this cytosolic pathway, giving rise to stimulation of a specific CD8+ T-cell hybridoma. The results suggest that, in contrast to the AC domain, the hemolysin moiety of ACT does not reach the cytosolic entry of the MHC class I pathway.

* Corresponding author. Mailing address: Institute of Microbiology CAS, Vídenská 1083, CZ-142 20 Prague 4, Czech Republic. Phone: (4202) 475 2762. Fax: (4202) 472 2257. E-mail: sebo{at}biomed.cas.cz.

Infection and Immunity, January 2000, p. 247-256, Vol. 68, No. 1
0019-9567/0/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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