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Luzzi JR, Santos JCD, Conti JM, Pereira JLG, Xavier RAN, Merchan EMB. REDUÇÃO NO TEMPO DE ESPERA PARA DOAÇÃO APÓS APLICAR MELHORIAS NO FLUXO DE ATENDIMENTO. Hematol Transfus Cell Ther 2021. [DOI: 10.1016/j.htct.2021.10.649] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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Luzzi JR, Merchan EMB, Santos JCD, Brito CA, Goto EH, Xavier RAN, Conti JM. COMPARAÇÃO DO VOTO DE AUTOEXCLUSÃO ELETRÔNICO VERSUS VOTO DE AUTOEXCLUSÃO MANUAL. Hematol Transfus Cell Ther 2021. [DOI: 10.1016/j.htct.2021.10.633] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Galdino H, Saar Gomes R, Dos Santos JC, Pessoni LL, Maldaner AE, Marques SM, Gomes CM, Dorta ML, de Oliveira MAP, Joosten LAB, Ribeiro-Dias F. Leishmania (Viannia) braziliensis amastigotes induces the expression of TNFα and IL-10 by human peripheral blood mononuclear cells in vitro in a TLR4-dependent manner. Cytokine 2016; 88:184-192. [PMID: 27649507 DOI: 10.1016/j.cyto.2016.09.009] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2016] [Revised: 09/12/2016] [Accepted: 09/14/2016] [Indexed: 11/30/2022]
Abstract
While the role of Toll-like receptors (TLRs) has been investigated in murine models of tegumentary leishmaniasis caused by Leishmania (Viannia) braziliensis, the interaction between TLRs and Leishmania sp. has not been investigated in human cells. The aim of this study was to evaluate the involvement of TLR4 in cytokine production of human peripheral blood mononuclear cells (PBMCs) induced by L. braziliensis, and whether the parasite alters the expression of TLR4 on monocytes/macrophages. Amastigote forms were obtained from mice lesions and PBMCs were isolated from healthy donors. PBMCs were cultured in absence or presence of IFNγ, TLR4 neutralizing antibodies, natural antagonist of TLR4 (Bartonella LPS), TLR4 agonist (E. coli LPS), and amastigote forms. The concentrations of tumor necrosis factor (TNFα) and interleukin 10 (IL-10) were assayed by ELISA and TLR4 expression by flow cytometry. Amastigotes forms of L. braziliensis induced TNFα and IL-10 production only in IFNγ-primed PBMCs. The TNFα and IL-10 production was inhibited by TLR4 neutralization, both with anti-TLR4 antibodies and Bartonella LPS. Interestingly, addition of E. coli LPS further increased TNFα but not IL-10 production induced by L. braziliensis amastigotes. Amastigotes of L. braziliensis strongly reduced membrane TLR4 expression on monocytes/macrophages, apparently by internalization after the infection. The present study reveals that TLR4 drives the production of TNFα and IL-10 induced by L. braziliensis amastigotes and that the parasites decrease TLR4 expression on monocyte surface.
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Affiliation(s)
- Hélio Galdino
- Instituto de Patologia Tropical e Saúde Pública, Universidade Federal de Goiás, Goiânia, Goiás, Brazil
| | - Rodrigo Saar Gomes
- Instituto de Patologia Tropical e Saúde Pública, Universidade Federal de Goiás, Goiânia, Goiás, Brazil
| | - Jessica Cristina Dos Santos
- Instituto de Patologia Tropical e Saúde Pública, Universidade Federal de Goiás, Goiânia, Goiás, Brazil; Department of Internal Medicine, Radboud University Medical Center and Radboud Center of Infectious Diseases (RCI), Nijmegen, The Netherlands
| | - Lívia Lara Pessoni
- Instituto de Patologia Tropical e Saúde Pública, Universidade Federal de Goiás, Goiânia, Goiás, Brazil
| | - Anetícia Eduarda Maldaner
- Instituto de Patologia Tropical e Saúde Pública, Universidade Federal de Goiás, Goiânia, Goiás, Brazil
| | - Stéfanne Madalena Marques
- Instituto de Patologia Tropical e Saúde Pública, Universidade Federal de Goiás, Goiânia, Goiás, Brazil
| | - Clayson Moura Gomes
- Instituto de Patologia Tropical e Saúde Pública, Universidade Federal de Goiás, Goiânia, Goiás, Brazil
| | - Miriam Leandro Dorta
- Instituto de Patologia Tropical e Saúde Pública, Universidade Federal de Goiás, Goiânia, Goiás, Brazil
| | | | - Leo A B Joosten
- Instituto de Patologia Tropical e Saúde Pública, Universidade Federal de Goiás, Goiânia, Goiás, Brazil; Department of Internal Medicine, Radboud University Medical Center and Radboud Center of Infectious Diseases (RCI), Nijmegen, The Netherlands.
| | - Fátima Ribeiro-Dias
- Instituto de Patologia Tropical e Saúde Pública, Universidade Federal de Goiás, Goiânia, Goiás, Brazil.
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