Mem Inst Oswaldo Cruz, Rio de Janeiro, VOLUME 115 | JUNE 2020
Original Article

Evaluation of different total Leishmania amazonensis antigens for the development of a first-generation vaccine formulated with a Toll-like receptor-3 agonist to prevent cutaneous leishmaniasis

María José Germanó1,  Esteban Sebastián Lozano1,2, María Victoria Sanchez1, Flavia Alejandra Bruna1, María Fernanda García-Bustos3, Arianna Lourdes Sosa Lochedino1, María Cristina Salomón2, Ana Paula Fernandes4, Juan Pablo Mackern-Oberti1,2, Diego Esteban Cargnelutti1,2,+

1Consejo Nacional de Investigaciones Científicas y Tecnológicas, Universidad Nacional de Cuyo, Instituto de Medicina y Biología Experimental de Cuyo, Mendoza, Argentina
2Universidad Nacional de Cuyo, Facultad de Ciencias Médicas, Mendoza, Argentina
3Consejo Nacional de Investigaciones Científicas y Tecnológicas, Instituto de Patología Experimental, Salta, Argentina
4Universidade Federal de Minas Gerais, Faculdade de Farmácia, Belo Horizonte, MG, Brasil

DOI: 10.1590/0074-02760200067
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BACKGROUND Unfortunately, no any vaccine against leishmaniasis has been developed for human use. Therefore, a vaccine based on total Leishmania antigens could be a good and economic approach; and there are different methodologies to obtain these antigens. However, it is unknown whether the method to obtain the antigens affects the integrity and immune response caused by them.
OBJECTIVES to compare the protein profile and immune response generated by total L. amazonensis antigens (TLA) produced by different methods, as well as to analyse the immune response and protection by a first-generation vaccine formulated with sonicated TLA (sTLA) and polyinosinic:polycytidylic acid [Poly (I:C)].
METHODS TLA were obtained by four different methodologies and their integrity and immune response were evaluated. Finally, sTLA was formulated with Poly (I:C) and their protective immune response was measured.
FINDINGS sTLA presented a conserved protein profile and induced a strong immune response. In addition, Poly (I:C) improved the immune response generated by sTLA. Finally, sTLA + Poly (I:C) formulation provided partial protection against L. amazonensis infection.
MAIN CONCLUSIONS The protein profile and immune response depend on the methodology used to obtain the antigens. Also, the formulation sTLA + Poly (I:C) provides partial protection against cutaneous leishmaniasis in mice.

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Financial support: Universidad Nacional de Cuyo (UNCuyo SIIP 06/J499), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) (PIP 11220150100210Co 2015-2017), Agencia Nacional de Promoción Científica y Tecnológica (AGENCIA) (PICT Nº 2018-01511), Universidad del Aconcagua (CIUDA 2017-2019) and Secretaría de Políticas Universitarias (SPU) (VT42-UNCU11839).
+ Corresponding author:
Received 13 February 2020
Accepted 15 June 2020

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