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Infection and Immunity, April 2009, p. 1700-1707, Vol. 77, No. 4
0019-9567/09/$08.00+0     doi:10.1128/IAI.01470-08
Copyright © 2009, American Society for Microbiology. All Rights Reserved.

Paracoccidioides brasiliensis Vaccine Formulations Based on the gp43-Derived P10 Sequence and the Salmonella enterica FliC Flagellin{triangledown}

Catarina J. M. Braga,1 Glauce M. G. Rittner,1 Julian E. Muñoz Henao,1 Aline F. Teixeira,1 Liliana M. Massis,1 Maria E. Sbrogio-Almeida,2 Carlos P. Taborda,1 Luiz R. Travassos,3 and Luís C. S. Ferreira1*

Departamento de Microbiologia, Universidade de São Paulo, São Paulo, Brazil,1 Divisão de Desenvolvimento Tecnológico e Produção, Instituto Butantan, São Paulo, Brazil,2 Departamento de Microbiologia, Imunologia e Parasitologia, Universidade Federal de São Paulo, São Paulo, Brazil3

Received 2 December 2008/ Returned for modification 7 January 2009/ Accepted 31 January 2009

Paracoccidioidomycosis (PCM) is a systemic granulomatous disease caused by the dimorphic fungus Paracoccidioides brasiliensis. Anti-PCM vaccine formulations based on the secreted fungal cell wall protein (gp43) or the derived P10 sequence containing a CD4+ T-cell-specific epitope have shown promising results. In the present study, we evaluated new anti-PCM vaccine formulations based on the intranasal administration of P. brasiliensis gp43 or the P10 peptide in combination with the Salmonella enterica FliC flagellin, an innate immunity agonist binding specifically to the Toll-like receptor 5, in a murine model. BALB/c mice immunized with gp43 developed high-specific-serum immunoglobulin G1 responses and enhanced interleukin-4 (IL-4) and IL-10 levels. On the other hand, mice immunized with recombinant purified flagellins genetically fused with P10 at the central hypervariable domain, either flanked or not by two lysine residues, or the synthetic P10 peptide admixed with purified FliC elicited a prevailing Th1-type immune response based on lung cell-secreted type 1 cytokines. Mice immunized with gp43 and FliC and intratracheally challenged with P. brasiliensis yeast cells had increased fungal proliferation and lung tissue damage. In contrast, mice immunized with the chimeric flagellins and particularly those immunized with P10 admixed with FliC reduced P. brasiliensis growth and lung damage. Altogether, these results indicate that S. enterica FliC flagellin modulates the immune response to P. brasiliensis P10 antigen and represents a promising alternative for the generation of anti-PCM vaccines.

* Corresponding author. Mailing address: Department of Microbiology-ICB, University of São Paulo, Av. Prof. Lineu Prestes, 1374 São Paulo, SP 05008-000, Brazil. Phone: 55-11-30917338. Fax: 55-11-3091-7354. E-mail: lcsf{at}usp.br

{triangledown} Published ahead of print on 9 February 2009.

Editor: A. Casadevall

Infection and Immunity, April 2009, p. 1700-1707, Vol. 77, No. 4
0019-9567/09/$08.00+0     doi:10.1128/IAI.01470-08
Copyright © 2009, American Society for Microbiology. All Rights Reserved.





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