Differentiation of CD8+ T cells from tumor-invaded and tumor-free lymph nodes of melanoma patients: role of common gamma-chain cytokines.
J Immunol
; 171(4): 2134-41, 2003 Aug 15.
Article
em En
| MEDLINE
| ID: mdl-12902520
ABSTRACT
Differentiation of CD8(+) T cells at the tumor site toward effector and memory stages may represent a key step for the efficacy of antitumor response developing naturally or induced through immunotherapy. To address this issue, CD8(+) T lymphocytes from tumor-invaded (n = 142) and tumor-free (n = 42) lymph nodes removed from the same nodal basin of melanoma patients were analyzed for the expression of CCR7, CD45RA, perforin, and granzyme B. By hierarchical cluster analysis, CD8(+) T cells from all tumor-free lymph nodes and from 56% of the tumor-invaded lymph node samples fell in the same cluster, characterized mainly by CCR7(+) CD45RA(+/-) cytotoxic factor(-) cells. The remaining three clusters contained only samples from tumor-invaded lymph nodes and showed a progressive shift of the CD8(+) T cell population toward CCR7(-) CD45RA(-/+) perforin(+) granzyme B(+) differentiation stages. Distinct CD8(+) T cell maturation stages, as defined by CCR7 vs CD45RA and by functional assays, were identified even in melanoma- or viral Ag-specific T cells from invaded lymph nodes by HLA tetramer analysis. Culture for 7 days of CCR7(+) perforin(-) CD8(+) T cells from tumor-invaded lymph nodes with IL-2 or IL-15, but not IL-7, promoted, mainly in CCR7(+)CD45RA(-) cells, proliferation coupled to differentiation to the CCR7(-) perforin(+) stage and acquisition of melanoma Ag-specific effector functions. Taken together, these results indicate that CD8(+) T cells differentiated toward CCR7(-) cytotoxic factor(+) stages are present in tumor-invaded, but not in tumor-free, lymph nodes of a relevant fraction of melanoma patients and suggest that cytokines such as IL-2 and IL-15 may be exploited to promote Ag-independent maturation of anti-tumor CD8(+) T cells.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Linfócitos do Interstício Tumoral
/
Linfócitos T CD8-Positivos
/
Receptores de Interleucina-7
/
Linfonodos
/
Melanoma
Tipo de estudo:
Prognostic_studies
Limite:
Humans
Idioma:
En
Revista:
J Immunol
Ano de publicação:
2003
Tipo de documento:
Article
País de afiliação:
Itália