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The Journal of Immunology, Vol 130, Issue 5 2149-2155, Copyright © 1983 by American Association of Immunologists

ARTICLES

Tissue distribution of human NK cells studied with anti-Leu-7 monoclonal antibody

L Si and TL Whiteside

The distribution and numbers of human natural killer (NK) cells in different lymphoid tissues and several tumors were determined with the use of monoclonal antibody to the Leu-7 antigen and immunohistologic methods. Anti-Leu-7 reacts with large granular lymphocytes containing most of NK activity in the peripheral blood. The Leu-7+ cells were found mainly in the germinal centers of secondary follicles in lymph nodes, spleens, and tonsils. The mean number of Leu-7+ cells in 40 germinal centers was 223 +/- 103 SD. Only rare cells were found in the thymus. In the follicles studied in serial sections, the distribution of the Leu-7+ cells was distinctly different from that of T cells, B cells and Ia+ cells. The Leu-7+ cells did not react with OKT 6 antibody specific for immature (control) thymocytes and Langerhans' cells. By double staining techniques, two populations of Leu-7+ cells were identified in lymphoid tissues: those that did and did not express the Ia-like antigen. The numbers and localization of the Leu-7+ cells varied in different tumors, but often the Leu-7+ cells surrounded the neoplastic nodules or were seen in contact with individual cancer cells. Anti-Leu-7 may be a useful reagent for monitoring the presence and localization of NK cells in normal and malignant human tissues.


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