Expressão das citoceratinas em dermatoses infecto-parasitárias associadas à hiperplasia epidérmica

BACKGROUND:Cytokeratins (K) are the major structural proteins of epithelial cells andthey display the greatest heterogeneity of all intermediate filament proteins. The study of manyisolated cytokeratins by immunomarcation enables the structural verification of the cytoskeletonin many neoplastic and inflammatory diseases.OBJECTIVE:To verify the immunohistochemical pattern of cytokeratin expression in infectious andparasitic diseases associated with squamous hyperplasia.METHODS: Histological sections obtained from formalin-fixed and paraffin-embedded tissue fromcromomycosis, paracoccidioidomycosis, leishmaniasis and condylomata acuminata lesions weremarked with the DEK10, LL025, LL002and AE1antibodies by the immunoperoxidase technique (avi-dina-botina).RESULTS:Different degrees of epidermal hyperplasia were observed predominantly or exclusively inthe following four diseases: absence of immunoreactivity to DE-K10in areas of intense epidermalhyperplasia and delayed K10immunohistochemical staining in areas of moderate to discreet/-absent hyperplasia; superbasal expression pattern for K16, regardless of the degree of hyperplasiaas well as superbasal epitops discharging for LL002(C14) and AE1(C10, 14, 16, 19).CONCLUSIONS:The modifications indicate that regardless of the nature of the etiologic agent anddegree of hyperplasia, changes in keratinocyte differentiation and proliferation may occur.FUNDAMENTOS: As citoceratinas(C) são as proteínas estruturais mais importantes das células epiteliais e exibem a maior heterogeneidade dentre todas as proteínas dos filamentos intermediários. Seu estudo através de imunomarcação possibilita a análise estrutural do citoesqueleto em vários afecções neoplásicas e inflamatórias. OBJETIVOS: Verificar o padrão imuno-histoquímico da expressão das citoceratinas na epiderme de doenças infecto-parasitárias associadas à hiperplasia escamosa. MÉTODOS: Cortes histológicos obtidos de tecidos pré-fixados e incluidos em parafina à partir de lesões de cromomicose, paracoccidioidomicose, leishmaniose e condiloma acuminado foram marcados com os anticorpos DEK10, LL025, LL002 e AE1 pela técnica de imunoperoxidase (avidina-biotina). RESULTADOS: A análise de áreas com intensidade variável de hiperplasia epidérmica presentes nos fragmentos mostrou exclusivamente e/ou predominantemente nas quatro doenças: ausência de expressão da C10 nas áreas de hiperplasia intensa e retardo da expressão nas áreas de hiperplasia moderada e/ou ausente; padrão suprabasal de marcação para a C16 independentemente do grau de hiperplasia como também, liberação de epítopos suprabasais para os marcadores LL002 (C14) e AE1 (C10,14,16,19). CONCLUSÕES: As modificações indicam que, independentemente da natureza do agente etiológico e do grau de hiperplasia presente, ocorrem alterações na diferenciação e proliferação do ceratinócito

Carcinoma Cuniculatum com Invasão Óssea Mimetizando Verruga Viral

Carcinoma cuniculatum is a rare variant of low-grade and well-differentiated squamous cell carcinoma. It is a locally invasive tumor, although it has low metastatic potential. It was originally described in the plantar region but may exceptionally appear in other locations. It predominates in middle-aged men and presents clinically as an exophytic, solitary, painful tumor, with insidious growth. Histologically, this tumor simulates a variety of benign dermatoses and may require several biopsies for the correct diagnosis. It is often misdiagnosed as a viral wart, due to the clinical similarity and the indolent course. The treatment of choice is surgical excision due to the high risk of recurrence and locally aggressive behavior. Amputation can be performed in cases of deep tissue invasion. We present a case of carcinoma cuniculatum in which the late diagnosis favored the invasion of the underlying bone, resulting in amputation of the affected finger.Carcinoma cuniculatum é uma variante rara de carcinoma epidermoide de baixo grau e bem diferenciado. Trata-se de tumor localmente invasivo, embora possua baixo potencial metastático. Originalmente descrito na região plantar pode excepcionalmente surgir noutras localizações. Predomina em homens de meia-idade e se apresenta clinicamente como tumor exofítico, solitário, doloroso, com crescimento insidioso. Histologicamente, este tumor simula uma variedade de dermatoses benignas, podendo exigir várias biópsias para o correto diagnóstico. Com frequência, é diagnosticado erroneamente como verruga viral, devido à semelhança clínica e ao curso indolente. O tratamento de escolha é a excisão cirúrgica pelo alto risco de recorrência e comportamento localmente agressivo. A amputação pode ser realizada em casos de invasão de tecidos profundos. Apresentamos um caso de carcinoma cuniculatum em que o diagnóstico tardio favoreceu a invasão do osso subjacente, resultando na amputação do quirodáctilo acometido

Morphological and histological characterization of sexual segment of the kidney in Notomabuya frenata (Cope, 1862) and Aspronema dorsivittatum (Cope, 1862) (Squamata, Mabuyidae)

The kidneys in two viviparous species of Neotropical lizards, Notomabuya frenata and Aspronema dorsivittatum (Mabuyidae), were investigated by light and scanning electron microscopy in order to determine the presence of the sexual segment of the kidney (SSK) and to study its morphology. The individuals used in this study belong to the Herpetological Collection of the Herpetology Laboratory - Reptiles of the Federal University of Juiz de Fora (CHUFJF-Reptiles) and they were collected between the years 2008 and 2012 from the Cerrado region in the state of Minas Gerais, Brazil. The SSK was present only in sexually mature males (with sperm in the testes / epididymis), whereas it was absent in sexually immature males. The nephron in both species consists of renal corpuscle, proximal convoluted tubule, distal convoluted tubule, collecting duct and sexual segment of the kidney. The SSK of the analyzed species were coated with a simple columnar epithelium, with high cells, basal nucleus and in the apical portion innumerable secretory granules. This study adds to the knowledge on reproductive biology and structures related to reproductive strategies of both lizard species and viviparous Neotropical lizards.

Pereskia aculeata Miller leaves present in vivo topical anti-inflammatory activity in models of acute and chronic dermatitis

AbstractEthnopharmacological relevance: The leaves of Pereskia aculeata Miller (Cactaceae), known as Barbados gooseberry, are used in Brazilian traditional medicine as emollients and to treat skin wounds and inflammation. This study investigated the topical anti-inflammatory activity of the hexane fraction (HF) obtained from the methanol extract of the leaves of this species in models of acute and chronic ear dermatitis in mice.Material and methods: Mice ear edema was induced by topical application of croton oil, arachidonic acid, capsaicin, ethyl-phenylpropiolate and phenol; and by subcutaneous injection of histamine. Ear biopsies were obtained to determine the levels of IL-1β, IL-6 and TNF-α cytokines by ELISA assay. Histopathological analysis was also performed to evaluate the HF activity in croton oil multiple application test. In addition, acute dermal irritation/corrosion test in rats was accomplished. HF chemical characterization was performed by GC–MS analysis.Results: HF intensively reduced the inflammatory process induced by all irritant agents used, except for arachidonic acid. This activity is related, at least in part, to the reduction of IL-6 and TNF-α cytokines levels. Moreover, when the glucocorticoid receptor antagonist mifepristone was used, HF failed to respond to the croton oil application.The results strongly suggested a glucocorticoid-like effect, which was reinforced by the presence of considerable amounts of sterol compounds identified in HF. The acute dermal irritaton/corrosion test showed no signs of toxicity.Conclusions: This study showed that the acute and chronic anti-inflammatory activity of P. aculeata leaves is very promising, and corroborates to better understand their ethnopharmacological applications

INCREASE OF GLYCOSAMINOGLYCANS AND METALLOPROTEINASES 2 AND 9 IN LIVER EXTRACELLULAR MATRIX ON EARLY STAGES OF EXTRAHEPATIC CHOLESTASIS

Context Cholestasis produces hepatocellular injury, leukocyte infiltration, ductular cells proliferation and fibrosis of liver parenchyma by extracellular matrix replacement. Objective Analyze bile duct ligation effect upon glycosaminoglycans content and matrix metalloproteinase (MMPs) activities. Methods Animals (6-8 weeks; n = 40) were euthanized 2, 7 or 14 days after bile duct ligation or Sham-surgery. Disease evolution was analyzed by body and liver weight, seric direct bilirubin, globulins, gamma glutamyl transpeptidase (GGT), alkaline phosphatase (Alk-P), alanine and aspartate aminotransferases (ALT and AST), tissue myeloperoxidase and MMP-9, pro MMP-2 and MMP-2 activities, histopathology and glycosaminoglycans content. Results Cholestasis caused cellular damage with elevation of globulins, GGT, Alk-P, ALT, AST. There was neutrophil infiltration observed by the increasing of myeloperoxidase activity on 7 (P = 0.0064) and 14 (P = 0.0002) groups which leads to the magnification of tissue injuries. Bile duct ligation increased pro-MMP-2 (P = 0.0667), MMP-2 (P = 0.0003) and MMP-9 (P<0.0001) activities on 14 days indicating matrix remodeling and establishment of inflammatory process. Bile duct ligation animals showed an increasing on dermatan sulfate and/or heparan sulfate content reflecting extracellular matrix production and growing mitosis due to parenchyma depletion. Conclusions Cholestasis led to many changes on rats&#8217; liver parenchyma, as so as on its extracellular matrix, with major alterations on MMPs activities and glycosaminoglycans content

Lupus Vulgar: Um Diagnóstico Desafiador

Lupus vulgaris is a clinical variant of cutaneous tuberculosis, a rare subtype of extrapulmonary infection caused by the Mycobacterium tuberculosis complex. A paucibacillary form associated with high degrees of immunity, predominantly in the face, may present several clinical and histopathological differential diagnoses, which makes its diagnosis challenging. We present a case of lupus vulgaris in an immunocompetent patient, whose initial clinical presentation and histopathology did not suggest the condition. The objective is to highlight the relevance of the hypothesis of cutaneous tuberculosis as an important differential diagnosis, especially in endemic areas.Lúpus vulgar é uma variante clínica de tuberculose cutânea, subtipo raro de infecção extrapulmonar causada pelo complexo Mycobacterium tuberculosis. Forma paucibacilar associada a alto grau de imunidade, predominantemente na face, pode apresentar vários diagnósticos diferenciais clínicos e histopatológicos, o que torna seu diagnóstico desafiador. Apresentamos um caso de lúpus vulgar em paciente imunocompetente, cuja apresentação clínica e histopatológica iniciais não sugeriam o diagnóstico. O objetivo é ressaltar a relevância da hipótese de tuberculose cutânea como importante diagnóstico diferencial, principalmente em áreas endémicas

POSITIVE CORRELATION BETWEEN DISEASE ACTIVITY INDEX AND MATRIX METALLOPROTEINASES ACTIVITY IN A RAT MODEL OF COLITIS

ContextInflammatory bowel disease, including ulcerative colitis and Crohn’s disease, comprising a broad spectrum of diseases those have in common chronic inflammation of the gastrointestinal tract, histological alterations and an increased activity levels of certain enzymes, such as, metalloproteinases.ObjectivesEvaluate a possible correlation of disease activity index with the severity of colonic mucosal damage and increased activity of metalloproteinases in a model of ulcerative colitis induced by dextran sulfate sodium.MethodsColitis was induced by oral administration of 5% dextran sulfate sodium for seven days in this group (n=10), whereas control group (n=16) received water. Effects were analyzed daily by disease activity index. In the seventh day, animals were euthanized and hematological measurements, histological changes (hematoxylin and eosin and Alcian Blue staining), myeloperoxidase and metalloproteinase activities (MMP-2 and MMP-9) were determined.ResultsDextran sulfate sodium group showed elevated disease activity index and reduced hematological parameters. Induction of colitis caused tissue injury with loss of mucin and increased myeloperoxidase (P<0.001) and MMP-9 activities (45 fold) compared to the control group.ConclusionsIn this study, we observed a disease activity index correlation with the degree of histopathological changes after induction of colitis, and this result may be related mainly to the increased activity of MMP-9 and mieloperoxidase