Recognition of tissue residing antigen by T cells in vasculitic lesions of giant cell arteritis

Journal of Molecular Medicine : Official Organ of the Gesellschaft Deutscher Naturforscher Und Ärzte
V Martinez-TaboadaJörg J Goronzy

Abstract

The objective of this study was to explore the nature of the antigen-specific T cell response in giant cell arteritis by analyzing clonally expanded T cells in temporal artery specimens. In temporal artery tissue from eight patients, 10% of the T cell receptor beta chain repertoire was systematically screened for clonal T cells by reverse-transcriptase polymerase chain reaction with selected BV, BJ, and BC specific primers and by direct sequencing of the amplified product. In five additional patients tissue-derived T cell clones were characterized. All expanded clonotypes were analyzed for their presence at different sites of the inflamed artery. T cell lines were tested for their proliferation to autologous monocytes pulsed with temporal artery extracts from patients with giant cell arteritis, polymyalgia rheumatica, and unrelated diseases. Clonally expanded T cells were identified in 30% of the BV-J combinations of the sampled repertoire. A subset of these clones were encountered at different sites of the inflammation, but not in the peripheral blood. The T cell receptor beta chain sequences were diverse. The patients had between none and five such clonotypes in the sampled repertoire, suggesting that only few T cell specific...Continue Reading

Citations

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