Immunotherapy Combining Mimotopes Selected by Phage Display Plus Amphotericin B Is Effective for Treatment Against Visceral Leishmaniasis

Tauane Gonçalves Soyer, Raquel Soares Bandeira Câmara, Isabela Amorim Gonçalves Pereira, Fernanda Fonseca Ramos, Marcelo Moreira de Jesus, Fernanda Ludolf, Guilherme de Paula Costa, Daniela Pagliara Lage, Camila Simões de Freitas, Danniele Luciana Vale, Breno Luiz Pimenta, Vívian Tamietti Martins, Alexsandro Sobreira Galdino, Miguel Angel Chávez-Fumagalli, Bruno Mendes Roatt, Grasiele de Sousa Vieira Tavares, Eduardo Antonio Ferraz Coelho

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The treatment for visceral leishmaniasis (VL) causes toxicity in patients, entails high cost and/or leads to the emergence of resistant strains. No human vaccine exists, and diagnosis presents problems related to the sensitivity or specificity of the tests. Here, we tested two phage clones, B1 and D11, which were shown to be protective against Leishmania infantum infection in a murine model as immunotherapeutics to treat mice infected with this parasite species. The phages were used alone or with amphotericin B (AmpB), while other mice received saline, AmpB, a wild-type phage (WTP) or WTP/AmpB. Results showed that the B1/AmpB and D11/AmpB combinations induced polarised Th1-type cellular and humoral responses, which were primed by high levels of parasite-specific IFN-γ, IL-12, TNF-α, nitrite and IgG2a antibodies, which reflected in significant reductions in the parasite load in distinct organs of the animals when analyses were performed 1 and 30 days after the treatments. Reduced organic toxicity was also found in these animals, as compared with the controls. In conclusion, preliminary data suggest the potential of the B1/AmpB and D11/AmpB combinations as immunotherapeutics against L. infantum infection.

Idioma originalInglés
Número de artículoe13037
PublicaciónParasite Immunology
EstadoPublicada - may. 2024


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