• JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
 
  Bookmark and Share
 
 
Thèse de Doctorat
DOI
10.11606/T.5.2001.tde-14062002-232344
Document
Auteur
Nom complet
Murilo Chiamolera
Adresse Mail
Unité de l'USP
Domain de Connaissance
Date de Soutenance
Editeur
São Paulo, 2000
Directeur
Jury
Velasco, Irineu Tadeu (Président)
Bonfa, Eloisa Silva Dutra de Oliveira
Calich, Vera Lucia Garcia
Carvalho, Ivan Fiore de
Seguro, Antonio Carlos
Titre en portugais
Expressão dos receptores FC de imunoglobulina A em fagócitos do sangue de pacientes com bacteremia.
Mots-clés en portugais
bacteremia/imunologia
citometeria de fluxo/métodos
fagócitos/imunologia
iga/análise
imonoglobulinas/análise
receptores FC/análise
Resumé en portugais
Expressão aumentada do receptor Fc de IgA (CD89) e da cadeia g associada, avaliadas respectivamente por citometria de fluxo e por “immunobloting”, foram encontradas em fagócitos do sangue de pacientes com bacteremia por germes gram-negativos, em comparação com controles e pacientes com bacteremia por gram-positivos. A Mr do CD89 avaliada por SDS-PAGE estava diminuída, com núcleo protéico de 32kDa, sugerindo alteração de glicosilação. O aumento da expressão do CD89 correlacionou-se com aumento dos níveis séricos de IL-6. A cadeia g estava fosforilada nos neutrófilos, sugerindo participação do CD89 na sepsis por gram-negativos.
Titre en anglais
Expression of immunoglobulin a FC receptors on blood phagocytes of patients with gram-negative bacteremia.
Mots-clés en anglais
iga FC receptor
sepsis
Resumé en anglais
The expression and function of FcaRI (CD89) were analyzed on blood monocytes and neutrophils of patients with gram-positive and gram-negative bacteremia. Eighteen patients with gram-positive bacteremia, sixteen patients with gram-negative bacteremia and twenty healthy individuals were studied. CD89 expression were analyzed by flow cytometry using specific stained antibodies. Analysis of the surface iodinated CD89 molecules by SDS-PAGE and of the CD89 g-associated chain by immunoblotting also were performed. A marked increase in expression of the a and g subunits of the FcaRI were found on both types of cells in patients with gram-negative bacteremia, but not in patients with gram-positive bacteremia. This increase was independent of serum IgA levels. FcaRI Mr was lower on cells from gram negative patients than on cells from controls (50-65 kDa vs 55-75 kDa) despite of similar 32 kDa backbone, indicating altered glycosylation. Increased levels of FcaRI on blood phagocytes correlated with enhanced serum IL-6 levels, but not with IFN-g or TNF-a levels. The CD89 g-associated chain was phosphorylated on neutrophils, suggesting an engagement of CD89 during gram negative sepsis.
 
AVERTISSEMENT - Regarde ce document est soumise à votre acceptation des conditions d'utilisation suivantes:
Ce document est uniquement à des fins privées pour la recherche et l'enseignement. Reproduction à des fins commerciales est interdite. Cette droits couvrent l'ensemble des données sur ce document ainsi que son contenu. Toute utilisation ou de copie de ce document, en totalité ou en partie, doit inclure le nom de l'auteur.
tde.pdf (1.04 Mbytes)
Date de Publication
2002-08-02
 
AVERTISSEMENT: Apprenez ce que sont des œvres dérivées cliquant ici.
Tous droits de la thèse/dissertation appartiennent aux auteurs
Centro de Informática de São Carlos
Bibliothèque Numérique de Thèses et Mémoires de l'USP. Copyright © 2001-2023. Tous droits réservés.