The Journal of Immunology, Vol 156, Issue 2 804-811, Copyright © 1996 by American Association of Immunologists

ARTICLES

Self-reactive cytotoxic gamma delta T lymphocytes in Graves' disease specifically recognize thyroid epithelial cells

M Catalfamo, C Roura-Mir, M Sospedra, P Aparicio, S Costagliola, M Ludgate, R Pujol-Borrell and D Jaraquemada
Immunology Unit, Germans Trias i Pujol University Hospital, Autonomous University of Barcelona, Spain.

In this paper we report the isolation of a self-reactive cytotoxic gamma delta T cell line, 158RE.2, that originates from the T lymphocyte population infiltrating the thyroid gland of a patient with Graves' disease. Functional data using this cell line demonstrate that gamma delta T cells expanded in the thyroid tissue specifically recognize a ligand expressed by thyroid epithelial cells and cell lines of endocrine epithelial origin. The TCR expressed by these gamma delta T cells--V gamma I/V delta 5--is unusual in peripheral blood lymphocytes, and its specificity is clearly different from that observed in a high percentage of gamma delta T cells from PBL, which express the common TCR V gamma 9/V delta 2. The V gamma I/V delta 5 receptor is involved in the recognition of the ligand expressed by the thyroid cells, but not in the NK-like activity also displayed by 158RE.2. These cells express CD8 alpha alpha dimers, which participate in the thyroid ligand recognition but not in the NK-like activity. The epithelial cell recognition is not restricted by classical MHC class I or class II molecules, although the CD8 alpha alpha participation in the recognition suggests the involvement of nonclassical MHC molecules. These are the first data to be presented on self-reacting gamma delta T cells in human epithelium.

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