title: Detection of cytokines and nitric oxide synthase in skin lesions of Jorge Lobo's disease patients.
abstract: Studies investigating the immunopathological aspects of Jorge Lobo's disease have shown that the inflammatory infiltrate consists mainly of histiocytes and multinucleated giant cells involving numerous yeast-like cells of Lacazia loboi, with the T lymphocytes more common than B lymphocytes and plasma cells. The quantification of cytokines in peripheral blood mononuclear cells culture supernatant has revealed alterations in the cytokines profile, characterized by predominance of a Th2 profile. In view of these findings and of the role of cytokines in cell interactions, the objective of the present study was to investigate the presence of the cytokines IL-10, TGF-ß1 and TNF-α, as well as iNOS enzyme in granulomas induced by L. loboi. Histological sections obtained from skin lesions of 16 patients were analyzed by immunohistochemistry for the presence of these cytokines and iNOS. The results showed that TGF-ß1 was the cytokine most frequently expressed by cells present in the inflammatory infiltrate, followed by IL-10. There was a minimum to discrete positivity of cells expressing TNF-α and iNOS. The results suggest that the presence of immunosuppressive cytokines in skin lesions of patients with the mycosis might be responsible for the lack of containment of the pathogen as demonstrated by the presence of numerous fungi in the granuloma.
authors.affiliation: Equipe Técnica de Biologia, Instituto Lauro de Souza Lima, Bauru, SP, Brazil. fmoreno@ilsl.br
authors.forename: Fátima Regina
authors.initials: FR
authors.lastname: Vilani-Moreno
authors.forename: Andréa de Faria Fernandes
authors.initials: Ade F
authors.lastname: Belone
authors.forename: Vanessa Soares
authors.initials: VS
authors.lastname: Lara
authors.forename: James
authors.initials: J
authors.lastname: Venturini
authors.forename: José Roberto Pereira
authors.initials: JR
authors.lastname: Lauris
authors.forename: Cleverson Teixeira
authors.initials: CT
authors.lastname: Soares
mesh_terms: D000328:Adult; D000368:Aged; D001759:Blastomycosis / Q000276:immunology* / Q000382:microbiology* / Q000473:pathology; D016207:Cytokines / Q000378:metabolism*; D003881:Dermatomycoses / Q000276:immunology* / Q000382:microbiology* / Q000473:pathology; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008875:Middle Aged; D019001:Nitric Oxide Synthase / Q000378:metabolism*; D020036:Onygenales / Q000276:immunology*; D012867:Skin / Q000382:microbiology / Q000473:pathology
chemical_list: D016207:Cytokines; D019001:Nitric Oxide Synthase