Résumé
Disseminated leishmaniasis (DL) differs from other clinical forms of the disease due to the presence of many non-ulcerated lesions (papules and nodules) in non-contiguous areas of the body. We describe the histopathology of DL non-ulcerated lesions and the presence of CD4-, CD20-, CD68-, CD31- and von Willebrand factor (vW)-positive cells in the inflamed area. We analysed eighteen biopsies from non-ulcerated lesions and quantified the inflamed areas and the expression of CD4, CD20, CD68, CD31 and vW using Image-Pro software (Media Cybernetics). Diffuse lymphoplasmacytic perivascular infiltrates were found in dermal skin. Inflammation was observed in 3-73% of the total biopsy area and showed a significant linear correlation with the number of vW+ vessels. The most common cells were CD68+ macrophages, CD20+ B-cells and CD4+ T-cells. A significant linear correlation between CD4+ and CD20+ cells and the size of the inflamed area was also found. Our findings show chronic inflammation in all DL non-ulcerated lesions predominantly formed by macrophages, plasmacytes and T and B-cells. As the inflamed area expanded, the number of granulomas and extent of the vascular framework increased. Thus, we demonstrate that vessels may have an important role in the clinical evolution of DL lesions.
Sujets)
Adolescent , Adulte , Enfant , Enfant d'âge préscolaire , Femelle , Humains , Mâle , Adulte d'âge moyen , Jeune adulte , Inflammation/immunologie , Leishmaniose cutanée/immunologie , Antigènes CD/immunologie , /immunologie , Antigènes de différenciation des myélomonocytes/immunologie , Lymphocytes B/immunologie , Lymphocytes B/anatomopathologie , Biopsie , /immunologie , Maladie chronique , Évolution de la maladie , Inflammation/anatomopathologie , Leishmaniose cutanée/anatomopathologie , Macrophages/immunologie , Macrophages/anatomopathologie , Facteur de von Willebrand/immunologieRésumé
Relatamos um caso de histiocitose cefálica benigna em uma criança do sexo masculino, de um ano e três meses de idade que desenvolveu múltiplas pápulas na região malar bilateralmente, sem outros comemorativos associados. A histopatologia caracterizou-se pelo padrão derme papilar, com imuno-histoquímica negativa para S100 e CD1a, e positiva para CD68, ficando assim estabelecido o diagnóstico desta histiocitose não- Langerhans, baseado nos aspectos clínicos, histopatológicos e imuno-histoquímicos característicos.
The present paper reports a case of benign cephalic histiocytosis in a 15-month baby boy, who developed multiple papules bilaterally in the malar region with no other associated manifestations. Histopathology revealed a papillary dermal pattern, while immunohistochemistry was negative for S100 and CD1a and positive for CD68. Therefore, diagnosis was established as non-Langerhans cell histiocytosis, based on the clinical, histopathological and immunohistochemical features present.
Sujets)
Humains , Nourrisson , Mâle , Antigènes CD/immunologie , Antigènes de différenciation des myélomonocytes/immunologie , Histiocytose non langerhansienne/anatomopathologie , Diagnostic différentiel , Histiocytose non langerhansienne/immunologie , ImmunohistochimieRésumé
A trypsinized preparation of Mycobacterium phlei, non specific stimulator of immunity (NSI), and Sheep Pox Virus (SPV) were inoculated in different groups of sheep to activate B-lymphocytes and induce SPV neutralizing substance(s). NSI sensitized sheep B-lymphocytes in the presence of NSI or lymphokine elaborated SPV neutralizing substance(s). The SPV sensitized B-lymphocytes also mediated such neutralizing substance(s). Healthy control sheep B-lymphocytes failed to show any appreciable amount of viral neutralizing substance. However, a significant virus neutralizing substance(s) was detected when healthy sheep B-lymphocytes were cultured in presence of NSI antigen along with lymphokines.