Evaluation of the anti-tuberculosis activity generated by different multigene DNA vaccine constructs

Michela Sali, Giovanni Pecorini, Giovanni Delogu, Giovanni Fadda, Sandra Clarizio, Cinzia Pusceddu, Antonella Zumbo, Stefano Rocca, Stefania Zanetti

Risultato della ricerca: Contributo in rivistaArticolo in rivistapeer review

17 Citazioni (Scopus)

Abstract

Development of multigenic constructs expressing Mycobacterium tuberculosis (Mtb) antigens may be a strategy to obtain improved DNA vaccines against tuberculosis (TB). Several multigenic constructs expressing two or three Mtb antigens as fusion proteins were developed, both as tPA- and ubiquitin-fusion proteins. To demonstrate proper protein expression and intracellular turnover all multiantigens were tagged with the HA epitope and constructs were used to transfect rhabdomyosarcoma (RD) cells. Antigen expression was demonstrated by immunofluorescence using anti-HA antibodies. C57Bl/6 mice were immunized with selected constructs and protective activity was assessed following aerogenic challenge with Mtb. Several of these constructs induced a significant level of protection in the lung and in the spleen. Immunization with the construct expressing tPA85B-ES6 induced a level of protection that approached that provided by BCG. Immunization with a combination of these constructs induced levels of protection that were not superior to those elicited by a single combination, and immunization with a construct expressing five Mtb antigens could not provide an improved level of protection compared to tPA85B-ES6. We conclude that the activity of a DNA vaccine based on tPA85B-ES6 cannot be enhanced by broadening the antigen repertoire with other highly immunogenic secreted Mtb proteins.
Lingua originaleEnglish
pagine (da-a)605-612
Numero di pagine8
RivistaMicrobes and Infection
Volume10
DOI
Stato di pubblicazionePubblicato - 2008

Keywords

  • Animals
  • Antigens, Bacterial
  • Mice
  • Mice, Inbred C57BL
  • Mycobacterium tuberculosis
  • Recombinant Fusion Proteins
  • Tuberculosis
  • Tuberculosis Vaccines
  • Tumor Cells, Cultured
  • Vaccines, DNA
  • Vaccines, Synthetic

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