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https://www.arca.fiocruz.br/handle/icict/47719
LOCALIZED SKIN INFLAMMATION DURING CUTANEOUS LEISHMANIASIS DRIVES A CHRONIC, SYSTEMIC IFN-γ SIGNATURE
Lesões
Malária
Tuberculose
Expressão genética
Leishmaniose
Interferons
Células exterminadoras naturais
Author
Affilliation
University of Pennsylvania. School of Veterinary Medicine. Department of Pathobiology. Philadelphia, United States of America.
University of Pennsylvania. School of Veterinary Medicine. Department of Pathobiology. Philadelphia, United States of America.
University of Pennsylvania. School of Veterinary Medicine. Department of Pathobiology. Philadelphia, United States of America.
Universidade Federal da Bahia. Complexo Hospitalar Universitário Professor Edgard Santos. Serviço de Imunologia. Salvador, BA, Brasil / Fundação Oswaldo Cruz. Instituto Gonçalo Moniz. Laboratório de Pesquisas Clínicas. Salvador, BA, Brasil.
Universidade Federal da Bahia. Complexo Hospitalar Universitário Professor Edgard Santos. Serviço de Imunologia. Salvador, BA, Brasil / Fundação Oswaldo Cruz. Instituto Gonçalo Moniz. Laboratório de Pesquisas Clínicas. Salvador, BA, Brasil.
Universidade Federal da Bahia. Complexo Hospitalar Universitário Professor Edgard Santos. Serviço de Imunologia. Salvador, BA, Brasil / Fundação Oswaldo Cruz. Instituto Gonçalo Moniz. Laboratório de Pesquisas Clínicas. Salvador, BA, Brasil.
Universidade Federal da Bahia. Complexo Hospitalar Universitário Professor Edgard Santos. Serviço de Imunologia. Salvador, BA, Brasil / Fundação Oswaldo Cruz. Instituto Gonçalo Moniz. Laboratório de Pesquisas Clínicas. Salvador, BA, Brasil.
University of Pennsylvania. School of Veterinary Medicine. Department of Pathobiology. Philadelphia, United States of America.
University of Pennsylvania. School of Veterinary Medicine. Department of Pathobiology. Philadelphia, United States of America.
University of Pennsylvania. School of Veterinary Medicine. Department of Pathobiology. Philadelphia, United States of America.
University of Pennsylvania. School of Veterinary Medicine. Department of Pathobiology. Philadelphia, United States of America.
Universidade Federal da Bahia. Complexo Hospitalar Universitário Professor Edgard Santos. Serviço de Imunologia. Salvador, BA, Brasil / Fundação Oswaldo Cruz. Instituto Gonçalo Moniz. Laboratório de Pesquisas Clínicas. Salvador, BA, Brasil.
Universidade Federal da Bahia. Complexo Hospitalar Universitário Professor Edgard Santos. Serviço de Imunologia. Salvador, BA, Brasil / Fundação Oswaldo Cruz. Instituto Gonçalo Moniz. Laboratório de Pesquisas Clínicas. Salvador, BA, Brasil.
Universidade Federal da Bahia. Complexo Hospitalar Universitário Professor Edgard Santos. Serviço de Imunologia. Salvador, BA, Brasil / Fundação Oswaldo Cruz. Instituto Gonçalo Moniz. Laboratório de Pesquisas Clínicas. Salvador, BA, Brasil.
Universidade Federal da Bahia. Complexo Hospitalar Universitário Professor Edgard Santos. Serviço de Imunologia. Salvador, BA, Brasil / Fundação Oswaldo Cruz. Instituto Gonçalo Moniz. Laboratório de Pesquisas Clínicas. Salvador, BA, Brasil.
University of Pennsylvania. School of Veterinary Medicine. Department of Pathobiology. Philadelphia, United States of America.
University of Pennsylvania. School of Veterinary Medicine. Department of Pathobiology. Philadelphia, United States of America.
Abstract
Cutaneous leishmaniasis is a localized infection controlled by CD4+ T cells that produce IFN-γ within lesions. Phagocytic cells recruited to lesions, such as monocytes, are then exposed to IFN-γ which triggers their ability to kill the intracellular parasites. Consistent with this, transcriptional analysis of patient lesions identified an interferon stimulated gene (ISG) signature. To determine whether localized L. braziliensis infection triggers a systemic immune response that may influence the disease, we performed RNA sequencing (RNAseq) on the blood of L. braziliensis-infected patients and healthy controls. Functional enrichment analysis identified an ISG signature as the dominant transcriptional response in the blood of patients. This ISG signature was associated with an increase in monocyte- and macrophage-specific marker genes in the blood and elevated serum levels IFN-γ. A cytotoxicity signature, which is a dominant feature in the lesions, was also observed in the blood and correlated with an increased abundance of cytolytic cells. Thus, two transcriptional signatures present in lesions were found systemically, although with a substantially reduced number of differentially expressed genes (DEGs). Finally, we found that the number of DEGs and ISGs in leishmaniasis was similar to tuberculosis–another localized infection–but significantly less than observed in malaria. In contrast, the cytolytic signature and increased cytolytic cell abundance was not found in tuberculosis or malaria. Our results indicate that systemic signatures can reflect what is occurring in leishmanial lesions. Furthermore, the presence of an ISG signature in blood monocytes and macrophages suggests a mechanism to limit systemic spread of the parasite, as well as enhance parasite control by pre-activating cells prior to lesion entry.
Keywords in Portuguese
SangueLesões
Malária
Tuberculose
Expressão genética
Leishmaniose
Interferons
Células exterminadoras naturais
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