title: Failure of nitric oxide production by macrophages and decrease in CD4+ T cells in oral paracoccidioidomycosis: possible mechanisms that permit local fungal multiplication.
abstract: Paracoccidioidomycosis is a chronic granulomatous disease that induces a specific inflammatory and immune response. The participation of nitric oxide (NO), a product of the inducible nitric oxide synthase enzyme (iNOS), as an important fungicidal molecule against Paracoccidioides brasiliensis has been demonstrated. In order to further characterize the Oral Paracoccidioidomycosis (OP), we undertook an immunohistochemical study of iNOS+, CD45RO+, CD3+, CD8+, CD20+, CD68+ cells and mast cells. The samples were distributed in groups according to the number of viable fungi per mm2. Our results showed weak immunolabeling for iNOS in the multinucleated giant cells (MNGC) and in most of the mononuclear (MN) cells, and the proportion of iNOS+ MN/MNGC cells in the OP were comparable to Control (clinically healthy oral tissues). Additionally, our analysis revealed a similarity in the number of CD4+ cells between the Control and the OP groups with higher numbers of fungi. These findings suggest that a low expression of iNOS and a decrease in the CD4+ T cells in OP may represent possible mechanisms that permit the local fungal multiplication and maintenance of active oral lesions.
authors.affiliation: Department of Stomatology (Oral Pathology), Dental School, Federal University of Goiás, Goiânia, Goiás, Brazil.
authors.forename: Aline Carvalho
authors.initials: AC
authors.lastname: Batista
authors.forename: Cleverson Teixeira
authors.initials: CT
authors.lastname: Soares
authors.forename: Vanessa Soares
authors.initials: VS
authors.lastname: Lara
mesh_terms: D000328:Adult; D000368:Aged; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology* / Q000378:metabolism; D002908:Chronic Disease; D005260:Female; D006801:Humans; D007111:Immunity, Cellular; D008264:Macrophages / Q000276:immunology* / Q000378:metabolism; D008297:Male; D008875:Middle Aged; D009059:Mouth Diseases / Q000276:immunology* / Q000382:microbiology; D009061:Mouth Mucosa / Q000276:immunology / Q000382:microbiology; D009569:Nitric Oxide / Q000096:biosynthesis*; D052247:Nitric Oxide Synthase Type II / Q000378:metabolism; D010229:Paracoccidioidomycosis / Q000276:immunology*
chemical_list: D009569:Nitric Oxide; D052247:Nitric Oxide Synthase Type II