Immunopathological characterization of human cutaneous leishmaniasis lesions caused by Leishmania (Viannia) spp. in Amazonian Brazil
American cutaneous leishmaniasis (ACL) is a chronic infectious disease caused by different protozoan species of Leishmania, and it is endemic in both tropical and subtropical countries. Using immunohistochemistry, we investigate the density of CD68+, lysozyme+, CD1a+, factor XIIIa+, CD4+, CD8+, CD56...
| Autores: | , , , , , , , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2017 |
| País: | Brasil |
| Institución: | Instituto Evandro Chagas (IEC) |
| Repositorio: | Repositório Digital do Instituto Evandro Chagas (Patuá) |
| Idioma: | inglés |
| OAI Identifier: | oai:patua.iec.gov.br:iec/2872 |
| Acceso en línea: | https://patua.iec.gov.br/handle/iec/2872 |
| Access Level: | acceso embargado |
| Palabra clave: | Leishmania / imunologia Leishmania braziliensis / imunologia Leishmaniose Cutânea / imunologia Leishmaniose Cutânea / parasitologia Células de Langerhans / citologia Células de Langerhans / imunologia Linfócitos T CD4-positivos / imunologia Linfócitos T CD8-Positivos / citologia Linfócitos T CD8-positivos / imunologia Derme / parasitologia Derme / patologia Fator XIIIa / metabolismo Interferon gama / metabolismo Macrófagos / imunologia Ativação de Macrófagos / imunologia Imuno-Histoquímica / métodos Reação em Cadeia da Polimerase / métodos |
| Sumario: | American cutaneous leishmaniasis (ACL) is a chronic infectious disease caused by different protozoan species of Leishmania, and it is endemic in both tropical and subtropical countries. Using immunohistochemistry, we investigate the density of CD68+, lysozyme+, CD1a+, factor XIIIa+, CD4+, CD8+, CD56+, interferon (IFN)-γ+, and inducible NO synthase (iNOS+) cells. These cells were analyzed from 22 biopsy samples obtained from the lesions of ACL patients, whose infection was caused by Leishmania (Viannia) spp. Histopathological analysis showed dense mononuclear inflammatory infiltration in the dermis, which was composed of lymphocytes, macrophages, plasma cells, and discrete tissue parasitism. Granulomatous reactions were also present in the majority of cases. The density of the activated macrophages was higher than that of inactivated macrophages in the lesions. The density of Langerhans cells (CD1a+) was lower than that of dermal dendrocytes (factor XIIIa+). The density of CD8+ T lymphocytes was higher than that of CD4+ T lymphocytes. The cellular density of these immunological markers in relation to the species of Leishmania demonstrated that L. (Viannia) sp. lesions had higher IFN-γ expression than that Leishmania (Viania) braziliensis lesions. The evaluation of these markers, according to disease progression, did not reveal any significant differences. L. (Viannia) sp. infection leads to a favorable immune response in the host, as predominantly represented by lysozyme+, factor XIIIa+, CD8+ T cells, and the expression of (IFN)-γ+ at the lesion site. |
|---|