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J Exp Med ; 195(10): 1325-36, 2002 May 20.
Artículo en Inglés | MEDLINE | ID: mdl-12021312

RESUMEN

The assembly of inflammatory lesions in rheumatoid arthritis is highly regulated and typically leads to the formation of lymphoid follicles with germinal center (GC) reactions. We used microdissection of such extranodal follicles to analyze the colonizing T cells. Although the repertoire of follicular T cells was diverse, a subset of T cell receptor (TCR) sequences was detected in multiple independent follicles and not in interfollicular zones, suggesting recognition of a common antigen. Unexpectedly, the majority of shared TCR sequences were from CD8 T cells that were highly enriched in the synovium and present in low numbers in the periphery. To examine their role in extranodal GC reactions, CD8 T cells were depleted in human synovium-SCID mouse chimeras. Depletion of synovial CD8 T cells caused disintegration of the GC-containing follicles. In the absence of CD8 T cells, follicular dendritic cells disappeared, production of lymphotoxin-alpha1beta2 markedly decreased, and immunoglobulin (Ig) secretion ceased. Immunohistochemical studies demonstrated that these CD8 T cells accumulated at the edge of the mantle zone. Besides their unique localization, they were characterized by the production of interferon (IFN)-gamma, lack of the pore-forming enzyme perforin, and expression of CD40 ligand. Perifollicular IFN-gamma+ CD8 T cells were rare in secondary lymphoid tissues but accounted for the majority of IFN-gamma+ cells in synovial infiltrates. We propose that CD8+ T cells regulate the structural integrity and functional activity of GCs in ectopic lymphoid follicles.


Asunto(s)
Artritis Reumatoide/patología , Linfocitos T CD8-positivos/inmunología , Centro Germinal/patología , Sinovitis/patología , Adolescente , Adulto , Anciano , Animales , Artritis Reumatoide/complicaciones , Artritis Reumatoide/inmunología , Secuencia de Bases , Linfocitos T CD8-positivos/metabolismo , Quimera/inmunología , Quimera/metabolismo , Femenino , Centro Germinal/inmunología , Humanos , Interferón gamma/biosíntesis , Interferón gamma/metabolismo , Masculino , Ratones , Ratones SCID , Persona de Mediana Edad , Datos de Secuencia Molecular , Receptores de Antígenos de Linfocitos T alfa-beta/genética , Receptores de Antígenos de Linfocitos T alfa-beta/metabolismo , Membrana Sinovial/inmunología , Membrana Sinovial/metabolismo , Membrana Sinovial/patología , Sinovitis/complicaciones , Sinovitis/inmunología , Factor de Necrosis Tumoral alfa/biosíntesis , Factor de Necrosis Tumoral alfa/metabolismo
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