Abstract
The distribution of NK-9 antigen presenting cells in human lymphoid tissues including spleen, tonsil, lymph node, and thymus was studied. The staining were done on formalin-fixed, histological sections. In peripheral blood NK-9 antigens are expressed on allospecific (CTL) and nonspecific (NK and AK) cytotoxic lymphocytes. In lymphoid tissues, the distribution of NK-9 positive cells was definitely different from "normal" T cell distribution, measured by pan T monoclonal markers. In tonsils and lymph nodes NK-9 positive cells were mainly located in and around germinal centers. However, only a proportion of these areas were NK-9 positive. In spleen NK-9 positive cells were located mainly in periarteriolar lymphocyte sheats and in germinal centers. Thymuses were practically NK-9 negative. These results support the earlier suggestions that cytotoxic cells take part in the immunoregulation in lymphoid tissues.
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