The Journal of Immunology, Vol 143, Issue 8 2480-2488, Copyright © 1989 by American Association of Immunologists

ARTICLES

Distribution of T cells bearing different forms of the T cell receptor gamma/delta in normal and pathological human tissues

B Falini, L Flenghi, S Pileri, P Pelicci, M Fagioli, MF Martelli, L Moretta and E Ciccone
Institute of Internal Medicine, University of Perugia, Italy.

Frozen sections from normal and pathologic human tissues were immunostained by the APAAP technique with three mAb directed against different epitopes of the TCR gamma delta; TCR delta 1 which binds to all cells bearing the TCR gamma delta; BB3 and delta TCS1 which, by immunoprecipitation studies, appear to react respectively with the disulfide-linked and nondisulfide-linked form of the TCR gamma delta. In normal thymus, TCR delta 1+ cells accounted for approximately 2% of the CD3+ thymocytes and were about three times more numerous in the medulla than in the cortex. TCR delta 1+ cells were mostly constituted by the delta TCS1 reactive subset (average ratio delta TCS1/BB3: 3.7). In the tonsil, the TCR delta 1+ cells (about 3% of CD3+ elements) were mainly located in the interfollicular area, where they frequently tended to arrange around high endothelium venules. In most samples, TCR delta 1+ cells were distributed beneath to the tonsil epithelium. Unlike thymus, the majority of TCR delta 1+ cells were usually constituted by the BB3-reactive subset (average BB3/delta TCS1 ratio: 2.0). A similar predominance of BB3+ over delta TCS1+ cells was also observed in normal peripheral blood. The spleen was the organ with the highest concentration of TCR delta 1+ cells that, like in the thymus, were mostly represented by delta TCS1+ elements. Noteworthy, the TCR delta 1+ cells were preferentially located in the splenic sinusoids while TCR alpha beta-bearing lymphocytes mostly occupied the periarteriolar sheaths of penicilliary arteries. The majority of neoplastic T cell proliferations studied lacked to express the TCR gamma delta. Two cases of beta F1-(TCR alpha beta-) T lymphoblastic lymphoma, however, were TCR gamma delta+ (delta TCS1+/BB3-). Both of them showed a stage II cortical phenotype, e.g., CD1+/CD3+/CD4+/CD8+/TCR delta 1+. Among inflammatory conditions, an increase of BB3+ cells was observed in close association with necrotic areas in cases of Kikuchi's and tuberculous lymphadenitis. The significance of this finding is under study.

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