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'CD4 POT.+''CD25 POT.HIGH''FOXP3 POT.+' regulatory T cells in humans
J Genre P R Errante; Luiz Vicente Rizzo; Meeting of the Brazilian Society for Immunology (31. 2006 Búzios)
Abstracts São Paulo, SP: Brazilian Society for Immunology, 2006
São Paulo 2006
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Title:
'CD4 POT.+''CD25 POT.HIGH''FOXP3 POT.+' regulatory T cells in humans
Author:
J Genre
P R Errante
;
Luiz Vicente Rizzo
;
Meeting of the Brazilian Society for Immunology (31. 2006 Búzios)
Subjects:
IMUNOLOGIA
Is Part Of:
Abstracts São Paulo, SP: Brazilian Society for Immunology, 2006
Notes:
Disponível em CD-ROM
Description:
Introduction and Aims: The human CD4+CD25+ T cell population contains a lineage of regulatory T (Treg) cells capable of modulating conventional immune responses. Most Treg cells are defined based on expression of CD4, high levels of CD25 and the transcription factor and critical mediator of their development and function, FOXP3. However, these markers have proven problematic for uniquely defining this specialized T cell subset in humans, in addition to the fact that it represents 1-4% of the total CD4+ circulating lymphocytes. The aim of our work is to establish a criteria to identify the Treg cell population in control individuals, to further determine if a diminished number or improper function of these cells could be responsible for the high incidence of autoimmunity and/or allergic symptoms observed in patients with Common Variable Immunodeficiency and Selective IgA deficiency. Methods: Human peripheral blood mononuclear cells were prepared by centrifugation over Isolymph gradients. For immunostaining, FITC-, PE- and APC- conjugated antibodies against human CD4, CD25, FOXP3 and the respective isotype controls were used. Quantitative analysis of CD4+CD25lowFOXP3+ and CD4+CD25highFOXP3+ Treg cells was performed by flow cytometry technique. Results are presented by median ± standard deviation. Results: We studied 7 males and 8 females with average age of 26,67 ± 3,81. Comparison of CD4+CD25HighFOXP3+ (73,90 ± 10,44) and CD4+CD25LowFOXP3+(49,70 ± 17,11) populations
by Mann-Whitney U test have demonstrated a significant statistical difference (p<0,0003) regarding FOXP3 expression. Conclusion: Human CD4+CD25+ T cells comprise a mixed population consisting of conventional activated T cells expressing CD25 as well as Treg cells. The human CD4+CD25high T cell population corresponds with the one that expresses high levels of FOXP3.
Publisher:
São Paulo
Creation Date:
2006
Format:
res. CL.028.
Language:
English
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