Immunopathological characterization of human cutaneous leishmaniasis lesions caused by Leishmania (Viannia) spp. in Amazonian Brazil

• Autor(a) principal: Gomes, Claudia Maria de Castro
• Data de Publicação: 2017
• Outros Autores: Sousa, Maria Gloria Teixeira, Menezes, Joyce Prieto Bezerra, Batista, Marliane Batista, Lima, Ana Carolina Stocco, Belda Jr, Walter, Bradshaw, Daniel, Gama, Monica Elinor Alves, Laurenti, Márcia Dalastra, Silveira, Fernando Tobias, Corbett, Carlos Eduardo Pereira
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Digital do Instituto Evandro Chagas (Patuá)
• Texto Completo: https://patua.iec.gov.br/handle/iec/2872
• topic: 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

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.