RESUMO
A simple experimental model of cell degranulation was implemented that exposed mast cells obtained from Sprague-Dawley rats to saponin. The model is flexible, asy, and low cost, is not very time-consuming to run, and needs a minimum of laboratory resources. It has been used for the last three years in our undergraduate medical physiology courses and has replaced the classic utilization of slides and drawings.
Assuntos
Degranulação Celular , Educação de Graduação em Medicina/métodos , Laboratórios , Mastócitos/fisiologia , Fisiologia/educação , Animais , Masculino , Ratos , Ratos Sprague-DawleyRESUMO
Las células de langerhans (CL) intervienen en la respuesta inflamatoria de la piel, participando activamente en la fase de inmunoestimulación de la respuesta inmunitaria mediante su interacción con los linfocitos T, la cual ocurre en los órganos linfoides secundarios. Cuando ocurre un insulto cutáneo, las CL al capturar el antígeno, maduran y migran rápidamente a los ganglios linfáticos acumulándose en la paracorteza. Una vez el ganglio, participan en la fase de inmunestimulación de la respuesta inmunitaria al presentar antígeno a linfocitos T vírgenes, activándolos. Los linfocitos T activados migran y se anidan en la piel donde participan en la fase de retención y proliferación e interactúan con los queratinocitos y las células de langerhans residentes a través de una serie de señales accesorias. El presente trabajo realiza una actualización sobre la importante función de las Cl con énfasis en su papel como inmunocito viajero involucrado en la fase inmunoestimuladora de la respuesta inmunitaria
Assuntos
Humanos , Masculino , Feminino , Inflamação , Células de Langerhans , Pele , Linfócitos TRESUMO
Through a pilot study which includes a clinical, molecular and immunopathological approach to the chronic Hepatitis induced by HBV or by HCV, we determined that 66% of HBsAg carriers are in the "non viremic" phase. The positive HBeAg "viremic" carriers showed HBV-DNA quantitation which varies between > 50 pg to > 100 pg. Both types of carries are infected with the "wild" type HBV. Each subgroup of positive surface antigemia carriers demonstrated a differential immunopathological response. So far, 96% of the HCV carriers investigated, showed HCV-RNA associated to repeatedly positive anti-HCV antibodies. Those patients with increased ALT values uniformly expressed liver histopathological signs of inflammation caused by HCV; demonstrating also the presence of peripheral blood mononuclear cells infected with HCV. At the present, the genotypes investigation indicates a predominance of HCV genotype II (1b). Autoimmune phenomenons associated to HCV have been detected only in 3 patients. The therapeutic approach with interferon alpha applied to the HCV infection preliminary showed similar results to those reported worldwide. Currently, a comprehensive approach to the chronic HBV and chronic HCV infections requires the application of Immunochemistry, Molecular Biology and Cellular Immunology combined technologies.