Leishmania (L.) infantum chagasi isolated from skin lesions of patients affected by non-ulcerated cutaneous leishmaniasis lead to visceral lesion in hamsters

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Flores, Gabriela V. Araujo ; Pacheco, Carmen M. Sandoval ; Ferreira, Aurea F. ; Tomokane, Thaise Yumie ; Nunes, Juliana B. ; Colombo, Fabio A. ; Sosa-Ochoa, Wilfredo H. ; Zuniga, Concepcion ; Silveira, Fernando T. ; Corbett, Carlos E. P. ; Laurenti, Marcia D.

• Tipo de documento: Artigo Científico
• Fonte: Parasitology International; v. 93, p. 9-pg., 2022-12-26.

Resumo

In Central America, Leishmania (L.) infantum chagasi infection causes visceral leishmaniasis (VL) and non -ulcerated cutaneous leishmaniasis (NUCL). The aim of the present study was to evaluate the course of an experimental infection in hamsters caused by L. (L.) infantum chagasi isolated from patients affected by NUCL compared with a strain isolated from a patient with VL. Stationary phase parasites in culture were inoculated through subcutaneous and intraperitoneal routes in hamsters. Following the post-infection times, a histopath-ological study, parasite load and cytokine determination in skin from the cutaneous inoculation site and viscera were performed. Animals subcutaneously infected with the different strains did not develop macroscopic lesions at the inoculation site, and the histopathological changes in the dermis were very slight. Regarding the histo-pathological study of the viscera, we observed the portal mononuclear inflammatory infiltrate, the presence of nodules in the hepatic parenchyma and the proliferation of macrophages in the spleen, which increased over the infection course. Overall, the parasite load in the liver and spleen and in the total IgG titres in the sera of infected hamster showed an increase with the time of infection, regardless of the route of inoculation. Regarding cellular immunity, we did not observe an increase or decrease in pro-and anti-inflammatory cytokines compared to the healthy control, except for IL-10, which was evident in the infected animals. The data showed that strains iso-lated from NUCL cause visceral lesions in the hamsters regardless of the route of inoculation, and they were similar to parasites isolated from VL humans. (AU)

• Processo FAPESP: 17/24834-9 - Avaliação da evolução da infecção experimental em hamster por parasitos isolados de lesão cutânea atípica e visceral humana causada por Leishmania (L.) infantum chagasi no município de Amapala, Valle, Honduras
• Beneficiário: Gabriela Venicia Araujo Flores
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 18/04698-6 - Leishmaniose cutânea não ulcerada ou atípica causada pela Leishmania (L.) infantum chagasi no município de Amapala, Valle, Honduras: caracterização imuno-histopatológica das lesões de pele com ênfase na participação das células apresentadoras de antígenos
• Beneficiário: Carmen Maria Sandoval Pacheco
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 14/50315-0 - Leishmanioses na América Latina: uma perspectiva avançada sobre fatores imunopatogenéticos da infecção cutânea e visceral, imunomoduladores da saliva de vetores flebotomíneos e exo-antígenos imunogênicos de Leishmania (L.) infantum chagasi candidatos à vacina
• Beneficiário: Marcia Dalastra Laurenti
• Modalidade de apoio: Auxílio à Pesquisa - Temático