<i>Leishmania infantum</i> Axenic Amastigotes Induce Human Neutrophil Extracellular Traps and Resist NET-Mediated Killing
Neutrophils are multifaceted cells that, upon activation, release meshes of chromatin associated with different proteins, known as neutrophil extracellular traps (NETs). <i>Leishmania amazonensis</i> promastigotes and amastigotes induce NET release, and we have identified the signaling p...
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| Format: | Article |
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MDPI AG
2023-06-01
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| Series: | Tropical Medicine and Infectious Disease |
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| Online Access: | https://www.mdpi.com/2414-6366/8/7/336 |
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| author | Thamara K. F. Oliveira Jullyanna Oliveira-Silva Leandra Linhares-Lacerda Vanderlei da Silva Fraga-Junior Claudia F. Benjamim Anderson B. Guimaraes-Costa Elvira M. Saraiva |
| author_facet | Thamara K. F. Oliveira Jullyanna Oliveira-Silva Leandra Linhares-Lacerda Vanderlei da Silva Fraga-Junior Claudia F. Benjamim Anderson B. Guimaraes-Costa Elvira M. Saraiva |
| author_sort | Thamara K. F. Oliveira |
| collection | DOAJ |
| description | Neutrophils are multifaceted cells that, upon activation, release meshes of chromatin associated with different proteins, known as neutrophil extracellular traps (NETs). <i>Leishmania amazonensis</i> promastigotes and amastigotes induce NET release, and we have identified the signaling pathways involved in NET extrusion activated by promastigotes. Amastigotes maintain the infection in vertebrate hosts, and we have shown the association of NETs with amastigotes in human biopsies of cutaneous leishmaniasis. However, the interaction of amastigotes and neutrophils remains poorly understood. Our study aimed to characterize the pathways involved in the formation of NETs induced by axenic amastigotes from <i>L. infantum,</i> the causal agent of visceral leishmaniasis. Human neutrophils pretreated with signaling pathway inhibitors were incubated with amastigotes, and NET release was quantified in the culture supernatant. Amastigote viability was checked after incubation with NETs. We found that the release of NETs by neutrophils stimulated with these amastigotes requires the participation of elastase and peptidyl arginine deaminase and the involvement of PI3K, ROS, and calcium. Moreover, amastigotes are not susceptible to NET-mediated killing. Altogether, these findings improve our comprehension of the signaling pathways implicated in the interaction between amastigotes and human neutrophils. |
| first_indexed | 2024-03-11T00:35:10Z |
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| id | doaj.art-5dbd27851065488da1745fb8115a9527 |
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| issn | 2414-6366 |
| language | English |
| last_indexed | 2024-03-11T00:35:10Z |
| publishDate | 2023-06-01 |
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| record_format | Article |
| series | Tropical Medicine and Infectious Disease |
| spelling | doaj.art-5dbd27851065488da1745fb8115a95272023-11-18T21:38:47ZengMDPI AGTropical Medicine and Infectious Disease2414-63662023-06-018733610.3390/tropicalmed8070336<i>Leishmania infantum</i> Axenic Amastigotes Induce Human Neutrophil Extracellular Traps and Resist NET-Mediated KillingThamara K. F. Oliveira0Jullyanna Oliveira-Silva1Leandra Linhares-Lacerda2Vanderlei da Silva Fraga-Junior3Claudia F. Benjamim4Anderson B. Guimaraes-Costa5Elvira M. Saraiva6Laboratório de Imunologia das Leishmanioses, Instituto de Microbiologia Paulo de Góes, Centro de Ciências da Saúde, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-902, BrazilLaboratório de Imunologia das Leishmanioses, Instituto de Microbiologia Paulo de Góes, Centro de Ciências da Saúde, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-902, BrazilLaboratório de Imunologia das Leishmanioses, Instituto de Microbiologia Paulo de Góes, Centro de Ciências da Saúde, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-902, BrazilLaboratório de Imunologia Molecular e Celular, Instituto de Biofísica Carlos Chagas Filho, Centro de Ciências da Saúde, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-902, BrazilLaboratório de Imunologia Molecular e Celular, Instituto de Biofísica Carlos Chagas Filho, Centro de Ciências da Saúde, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-902, BrazilLaboratório de Imunologia das Leishmanioses, Instituto de Microbiologia Paulo de Góes, Centro de Ciências da Saúde, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-902, BrazilLaboratório de Imunologia das Leishmanioses, Instituto de Microbiologia Paulo de Góes, Centro de Ciências da Saúde, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-902, BrazilNeutrophils are multifaceted cells that, upon activation, release meshes of chromatin associated with different proteins, known as neutrophil extracellular traps (NETs). <i>Leishmania amazonensis</i> promastigotes and amastigotes induce NET release, and we have identified the signaling pathways involved in NET extrusion activated by promastigotes. Amastigotes maintain the infection in vertebrate hosts, and we have shown the association of NETs with amastigotes in human biopsies of cutaneous leishmaniasis. However, the interaction of amastigotes and neutrophils remains poorly understood. Our study aimed to characterize the pathways involved in the formation of NETs induced by axenic amastigotes from <i>L. infantum,</i> the causal agent of visceral leishmaniasis. Human neutrophils pretreated with signaling pathway inhibitors were incubated with amastigotes, and NET release was quantified in the culture supernatant. Amastigote viability was checked after incubation with NETs. We found that the release of NETs by neutrophils stimulated with these amastigotes requires the participation of elastase and peptidyl arginine deaminase and the involvement of PI3K, ROS, and calcium. Moreover, amastigotes are not susceptible to NET-mediated killing. Altogether, these findings improve our comprehension of the signaling pathways implicated in the interaction between amastigotes and human neutrophils.https://www.mdpi.com/2414-6366/8/7/336NETs<i>Leishmania</i>neutrophilssignaling pathwaysROSparasites |
| spellingShingle | Thamara K. F. Oliveira Jullyanna Oliveira-Silva Leandra Linhares-Lacerda Vanderlei da Silva Fraga-Junior Claudia F. Benjamim Anderson B. Guimaraes-Costa Elvira M. Saraiva <i>Leishmania infantum</i> Axenic Amastigotes Induce Human Neutrophil Extracellular Traps and Resist NET-Mediated Killing Tropical Medicine and Infectious Disease NETs <i>Leishmania</i> neutrophils signaling pathways ROS parasites |
| title | <i>Leishmania infantum</i> Axenic Amastigotes Induce Human Neutrophil Extracellular Traps and Resist NET-Mediated Killing |
| title_full | <i>Leishmania infantum</i> Axenic Amastigotes Induce Human Neutrophil Extracellular Traps and Resist NET-Mediated Killing |
| title_fullStr | <i>Leishmania infantum</i> Axenic Amastigotes Induce Human Neutrophil Extracellular Traps and Resist NET-Mediated Killing |
| title_full_unstemmed | <i>Leishmania infantum</i> Axenic Amastigotes Induce Human Neutrophil Extracellular Traps and Resist NET-Mediated Killing |
| title_short | <i>Leishmania infantum</i> Axenic Amastigotes Induce Human Neutrophil Extracellular Traps and Resist NET-Mediated Killing |
| title_sort | i leishmania infantum i axenic amastigotes induce human neutrophil extracellular traps and resist net mediated killing |
| topic | NETs <i>Leishmania</i> neutrophils signaling pathways ROS parasites |
| url | https://www.mdpi.com/2414-6366/8/7/336 |
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