Accumulation and local proliferation of antigen-specific CD4+ T cells in antigen-bearing tissue.
Immunol Cell Biol
; 89(4): 566-72, 2011 May.
Article
em En
| MEDLINE
| ID: mdl-21060322
ABSTRACT
Although activation and subsequent expansion of naive CD4(+) T cells within lymph nodes is well characterized, the fate of T effector cells activated within peripheral tissues during secondary reactions is poorly defined. Therefore, we studied the recruitment, proliferation and egress of antigen-specific Th1 effector cells in comparison with nonspecific Th1 cells throughout a delayed-type hypersensitivity reaction (DTH). Although we observed a high turnover of Th1 effector cells with unspecific high-rate recruitment and CCR7-dependent egress from the inflamed tissue in the early, acute DTH phase, a strong, selective accumulation of antigen-specific T cells occurred during the chronic, late DTH phase. This was mainly based on local proliferation of CD4(+) effector cells within the DTH tissue and concomitant retention. Considering the strong CCR7-dependent Th cell egress found in this model, the reduced CCR7 expression on antigen-specific T cells isolated from late-phase DTH tissue most likely contributes to the retention of these cells within the tissue. Thus, peripheral tissues can support not only the proliferation of CD8(+) T cells, as recently shown, but also that of CD4(+) T effector cells, forming a pool of tissue-resident T cells.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Linfócitos T CD4-Positivos
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Epitopos
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Antígenos
Limite:
Animals
Idioma:
En
Revista:
Immunol Cell Biol
Assunto da revista:
ALERGIA E IMUNOLOGIA
Ano de publicação:
2011
Tipo de documento:
Article
País de afiliação:
Alemanha