WELLINGTON LUIZ FERREIRA DA SILVA
Projetos de Pesquisa
Unidades Organizacionais
Instituto Central, Hospital das Clínicas, Faculdade de Medicina
LIM/53 - Laboratório de Micologia, Hospital das Clínicas, Faculdade de Medicina
LIM/53 - Laboratório de Micologia, Hospital das Clínicas, Faculdade de Medicina
7 resultados
Resultados de Busca
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- Revisiting Langerhans cells in paracoccidioidomycosis: expression of CD207/langerin in human cutaneous and mucosal lesions(2011) PAGLIARI, Carla; FERNANDES, Elaine Raniero; SILVA, Wellington Luiz Ferreira da; SILVA, Aline Alves de Lima; STEGUN, Felipe Weisshaupt; DUARTE, Maria Irma Seixas; SOTTO, Mirian NacagamiLangerhans cells are identified by the expression of langerin. We detected this molecule in cutaneous and mucosal lesions in paracoccidioidomycosis, an important infection in Latin America. Langerin+ cells were scarcely distributed, with short dendrites in epidermis and epithelium and were frequent in the dermis and corium, in the inflammatory infiltrate and granulomas. Mucosal lesions presented a higher expression of langerin in lesions with loose granulomas. For the first time we presented the expression of langerin in paracoccidioidomycosis. Positive cells in dermis and corium could represent migrating Langerhans cells or a new subset of langerin+ cells with a role in paracoccidioidomycosis.
- The hamster (Mesocricetus auratus) as an experimental model of toxocariasis: histopathological, immunohistochemical, and immunoelectron microscopic findings(2015) SILVA, Ana Maria Goncalves da; CHIEFFI, Pedro Paulo; SILVA, Wellington Luiz Ferreira da; KANASHIRO, Edite Hatsumi Yamashiro; RUBINSKY-ELEFANT, Guita; CUNHA-NETO, Edecio; MAIRENA, Eliane Conti; BRITO, Thales DeToxocariasis is a globally distributed parasitic infection caused by the larval stage of Toxocara spp. The typical natural hosts of the parasite are dogs and cats, but humans can be infected by the larval stage of the parasite after ingesting embryonated eggs in soil or from contaminated hands or fomites. The migrating larvae are not adapted to complete their life cycle within accidental or paratenic hosts like humans and laboratory animals, respectively, but they are capable of invading viscera or other tissues where they may survive and induce disease. In order to characterize hamsters (Mesocricetus auratus) as a model for Toxocara canis infection, histopathological and immunohistochemistry procedures were used to detect pathological lesions and the distribution of toxocaral antigens in the liver, lungs, and kidneys of experimentally infected animals. We also attempted to characterize the immunological parameters of the inflammatory response and correlate them with the histopathological findings. In the kidney, a correlation between glomerular changes and antigen deposits was evaluated using immunoelectron microscopy. The hamster is an adequate model of experimental toxocariasis for short-term investigations and has a good immunological and pathological response to the infection. Lung and liver manifestations of toxocariasis in hamsters approximated those in humans and other experimental animal models. A mixed Th2 immunological response to T. canis infection was predominant. The hamster model displayed a progressive rise of anti-toxocaral antibodies with the formation of immune complexes. Circulating antigens, immunoglobulin, and complement deposits were detected in the kidney without the development of a definite immune complex nephropathy.
- Paracoccidioides brasiliensis interacts with dermal dendritic cells and keratinocytes in human skin and oral mucosa lesions(2016) SILVA, Wellington Luiz Ferreira da; PAGLIARI, Carla; DUARTE, Maria Irma Seixas; SOTTO, Mirian N.Paracoccidioidomycosis (PCM) is a systemic disease caused by the fungus Paracoccidioides brasiliensis and Paracoccidioides lutzii. In PCM the skin and oral mucosa are often affected. Dendritic cells and keratinocytes of the integument play a role in innate and adaptive immune response against pathogens, due to their function as antigen presenting cells. Aiming to verify the interaction of P. brasiliensis with these cell populations, we studied 52 skin and 47 oral mucosa samples taken from patients with proven diagnosis of PCM. The biopsies were subjected to immunohistochemical and/or immunofluorescence staining with anti-factor XIIIa (marker of dermal dendrocytes), anti-CD207 (marker ofmature Langerhans cells), anti-pan cytokeratins (AE1-AE3) and anti-P. brasiliensis antibodies. Analyses with confocal laser microscopy were also performed for better visualization of the interaction between keratinocytes and the fungi. In sum, 42% of oral mucosa samples displayed yeast forms in Factor XIIIa dermal dendrocytes cytoplasm. Langerhans cells in skin and oral mucosa samples did not show yeast cells in their cytoplasm. In sum, 54% of skin and 60% of mucosal samples displayed yeast cells in the cytoplasm of keratinocytes. The parasitism of keratinocytes may represent a possible mechanism of evasion of the fungus to local immune mechanisms. Factor XIIIa dendrocytes and keratinocytes may be acting as antigen-presenting cells to fulfill the probably impaired function of Langerhans cells in skin and oral mucosa of human PCM.
- Paracoccidioidomycosis: Cells expressing IL17 and Foxp3 in cutaneous and mucosal lesions(2011) PAGLIARI, Carla; FERNANDES, Elaine Raniero; STEGUN, Felipe Weisshaupt; SILVA, Wellington Luiz F. da; DUARTE, Maria Irma Seixas; SOTTO, Mirian N.We demonstrated and quantified by immunohistochemistry the population of cells expressing IL17 and Foxp3 in cutaneous and mucosal paracoccidioidomycosis lesions, associating these populations of cells with different presentations of granulomatous response. For this purpose, 61 skin biopsies and 55 oral mucosal biopsies were evaluated. Cells expressing IL17 were distributed in the inflammatory infiltrate in both groups of lesions and were found in the vessels' wall too. Foxp3+ expression was limited to the nuclei of lymphocytes in the inflammatory infiltrate. The distribution of IL17 was similar among the groups; however, Foxp3+ cells were increased in mucosal lesions that displayed compact granulomas. The results suggest that IL17 seems to play a role in paracoccidioidomycosis cutaneous and mucosal lesions, probably as secondary cells in the clearance of the fungal antigens. The presence of Foxp3+ cells both in skin and mucosa corroborates some previous researches that suggest the role of this group of cells in the modulation of local immune response.
- Human kidney damage in fatal dengue hemorrhagic fever results of glomeruli injury mainly induced by IL17(2016) PAGLIARI, Carla; QUARESMA, Juarez Antonio Simoes; KANASHIRO-GALO, Luciane; CARVALHO, Leda Viegas de; VITORIA, Webster Oliveira; SILVA, Wellington Luiz Ferreira da; PENNY, Ricardo; VASCONCELOS, Barbara Cristina Baldez; VASCONCELOS, Pedro Fernando da Costa; DUARTE, Maria Irma SeixasAcute kidney injury is an unusual complication during dengue infection. The objective of this study was to better identify the characteristics of glomerular changes focusing on in situ immune cells and cytokines. An immunohistochemical assay was performed on 20 kidney specimens from fatal human cases of dengue hemorrhagic fever (DHF). It was observed a lymphomononuclear infiltrate, neutrophils and nuclear fragmentation in the glomeruli, hydropic degeneration, nuclear retraction, eosinophilic tubules and intense acute congestion. Sickle erythrocytes were frequent in glomeruli and inflammatory infiltrate. The glomeruli presented endothelial swelling and mesangial proliferation. Lymphocytes CD4+ predominated over CD8+ T cells, B cells and natural killer cells. There were also an expressive number of macrophagic CD68+ cells. 5100, Foxp3 and CD123 cells were not identified. Cells expressing IL17 and IL18+ cytokines predominated in the renal tissues, while IL4, IL6, IL10, IL13, TNF-alpha and IFN-gamma were rarely visualized. The high number of cells expressing IL17 and IL18+ could reflect the acute inflammatory response and possibly contribute to the local lesion. CD8+ T cells could play a role in the cytotoxic response. DHF is a multifactorial disease of capillary leakage associated with a ""Tsunami of cytokines expression"". The large numbers of cells expressing IL17 seems to play a role favoring the increased permeability.
- Human Hemorrhagic Pulmonary Leptospirosis: Pathological Findings and Pathophysiological Correlations(2013) BRITO, Thales De; AIELLO, Vera Demarchi; SILVA, Luis Fernando Ferraz da; SILVA, Ana Maria Goncalves da; SILVA, Wellington Luiz Ferreira da; CASTELLI, Jussara Bianchi; SEGURO, Antonio CarlosBackground: Leptospirosis is a re-emerging zoonosis with protean clinical manifestations. Recently, the importance of pulmonary hemorrhage as a lethal complication of this disease has been recognized. In the present study, five human necropsies of leptospirosis (Weil's syndrome) with extensive pulmonary manifestations were analysed, and the antibodies expressed in blood vessels and cells involved in ion and water transport were used, seeking to better understand the pathophysiology of the lung injury associated with this disease. Principal Findings: Prominent vascular damage was present in the lung microcirculation, with decreased CD34 and preserved aquaporin 1 expression. At the periphery and even inside the extensive areas of edema and intraalveolar hemorrhage, enlarged, apparently hypertrophic type I pneumocytes (PI) were detected and interpreted as a non-specific attempt of clearence of the intraalveolar fluid, in which ionic transport, particularly of sodium, plays a predominant role, as suggested by the apparently increased ENaC and aquaporin 5 expression. Connexin 43 was present in most pneumocytes, and in the cytoplasm of the more preserved endothelial cells. The number of type II pneumocytes (PII) was slightly decreased when compared to normal lungs and those of patients with septicemia from other causes, a fact that may contribute to the progressively low PI count, resulting in deficient restoration after damage to the alveolar epithelial integrity and, consequently, a poor outcome of the pulmonary edema and hemorrhage. Conclusions: Pathogenesis of lung injury in human leptospirosis was discussed, and the possibility of primary non-inflammatory vascular damage was considered, so far of undefinite etiopathogenesis, as the initial pathological manifestation of the disease.
- In Situ Immune Response in Human Chromoblastomycosis - A Possible Role for Regulatory and Th17 T Cells(2014) SILVA, Aline Alves de Lima; CRIADO, Paulo Ricardo; NUNES, Ricardo Spina; SILVA, Wellington Luiz Ferreira da; KANASHIRO-GALO, Luciane; DUARTE, Maria Irma Seixas; SOTTO, Mirian N.; PAGLIARI, CarlaBackground: Chromoblastomycosis is a chronic fungal infection that affects skin and subcutaneous tissue. Lesions can be classified in tumorous, verrucous, cicatricial and plaque type. The cellular immune response in the severe form of the disease seems to correlate with a Th2 pattern of cytokines. The humoral immune response also seems to play a role. We intended to explore the populations of regulatory T cells and the Th17 pattern. Methodology: Twenty-three biopsies of verrucous form were obtained from patients with clinical, culture and histopathological diagnostic of chromoblastomycosis, without treatment. It was performed an immunohistochemistry method to detect Foxp3, CD25, TGF-beta, IL-6, IL-17 and IL-23. Principal findings: IL-17 was the only cytokine with high expression in CBM when compared to normal skin. The expression of Treg cells, TGF-beta, IL-6 and IL-23 were similar to normal skin. Conclusions/Significance: The constitution of a local immune response with high expression of IL-17 and low expression of other cytokines could be at least in part, an attempt to help the immune system against fungal infection. On the other hand, high levels of local immune response mediated by Th17 profile could overcome the role of Treg cells. The inefficient immunomodulation as a consequence of the unbalance by Treg/Th17 cells seems to corroborate with the less effective immune response against fungi.