Data/hora: 07/06/2024 00:37:51

Provedor de dados: | 56
País: | Brazil
Título: | Effect of aging and oral tolerance on dendritic cell function
Autores: | Simioni,P.U.; Fernandes,L.G.R.; Gabriel,D.L.; Tamashiro,W.M.S.C.
Data: | 2010-01-01
Ano: | 2010
Palavras-chave: | Aging; Oral tolerance; Dendritic cell; Antibody; Proliferation; Cytokine secretion.
Resumo: | Oral tolerance can be induced in some mouse strains by gavage or spontaneous ingestion of dietary antigens. In the present study, we determined the influence of aging and oral tolerance on the secretion of co-stimulatory molecules by dendritic cells (DC), and on the ability of DC to induce proliferation and cytokine secretion by naive T cells from BALB/c and OVA transgenic (DO11.10) mice. We observed that oral tolerance could be induced in BALB/c mice (N = 5 in each group) of all ages (8, 20, 40, 60, and 80 weeks old), although a decline in specific antibody levels was observed in the sera of both tolerized and immunized mice with advancing age (40 to 80 weeks old). DC obtained from young, adult and middle-aged (8, 20, and 40 weeks old) tolerized mice were less efficient (65, 17 and 20%, respectively) than DC from immunized mice (P &lt; 0.05) in inducing antigen-specific proliferation of naive T cells from both BALB/c and DO11.10 young mice, or in stimulating IFN-g, IL-4 and IL-10 production. However, TGF-β levels were significantly elevated in co-cultures carried out with DC from tolerant mice (P &lt; 0.05). DC from both immunized and tolerized old and very old (60 and 80 weeks old) mice were equally ineffective in inducing T cell proliferation and cytokine production (P &lt; 0.05). A marked reduction in CD86+ marker expression was observed in DC isolated from both old and tolerized mice (75 and 50%, respectively). The results indicate that the aging process does not interfere with the establishment of oral tolerance in BALB/c mice, but reduces DC functions, probably due to the decline of the expression of the CD86 surface marker.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2010000100010
Editor: | Associação Brasileira de Divulgação Científica
Relação: | 10.1590/S0100-879X2009007500024
Formato: | text/html
Fonte: | Brazilian Journal of Medical and Biological Research  v.43 n.1 2010
Fonte: | info:eu-repo/semantics/openAccess